Chapter 4 Quiz 1 (2nd Secondary Biology)
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Which of the following describes importance of excretion? It is the removal of.......
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Toxic materials.
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Waste products of metabolism.
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Excess substances from organisms.
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All of them
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This quiz from Chapter 4 of 2nd Secondary Biology focuses on the human excretory system. It assesses knowledge on the importance of excretion, pathways for excreting substances like urea and ethanol, and the role of skin structures. It's designed to enhance understanding of bodily waste removal processes.
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- 2.
One of the following materials leaves the body through a plasma membrane …..
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Fibers
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Cellulose
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Urea
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Nitrogen
Correct Answer
A. UreaExplanation
Urea is a waste product formed in the liver from the breakdown of proteins. It is then transported through the bloodstream to the kidneys, where it is filtered out of the blood and excreted in urine. The plasma membrane of the kidney cells allows urea to pass through and be eliminated from the body. Fibers, cellulose, and nitrogen are not waste products and do not leave the body through the plasma membrane.Rate this question:
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- 3.
According to their location in the skin structure, which of the following is anomalous?
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Pigment cells
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Hair muscle
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Hair follicles
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Blood capillaries
Correct Answer
A. Pigment cellsExplanation
Pigment cells are anomalous according to their location in the skin structure. This suggests that pigment cells are not typically found in the location mentioned or they are present in an abnormal or unexpected way.Rate this question:
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- 4.
The figure below represents a section in an important organ in the human’s body. What are the structure (1), (2), (3) and (4) respectively?
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Sweat gland / hair follicle / blood vessels / sebaceous gland
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Blood capillary / sebaceous gland / nerve endings / hair shaft
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Sweat tube / sebaceous gland / hair muscle / hair follicle
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Nerve ending / fat gland / hair muscle / sweat gland
Correct Answer
A. Sweat tube / sebaceous gland / hair muscle / hair follicle -
- 5.
Damaging the nerve ending in a finger leads to ...…
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We don’t feel cold when we touch an object like ice.
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Inability to pick things up.
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Finger weakness.
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All of them.
Correct Answer
A. All of them.Explanation
When the nerve endings in a finger are damaged, it can result in various impairments. The loss of sensation caused by nerve damage can lead to an inability to feel cold when touching objects like ice. Additionally, the weakened nerve signals can affect the finger's ability to grip and pick things up, resulting in an inability to perform fine motor tasks. Therefore, all of the given options, including not feeling cold, inability to pick things up, and finger weakness, are consequences of damaging the nerve endings in a finger.Rate this question:
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- 6.
About 80% of kidney stones can pass out through urinary system by drinking …...
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Water
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Juice
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Sugar drinks
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Milk
Correct Answer
A. WaterExplanation
Kidney stones are formed when there is a buildup of certain substances in the urine. Drinking water helps to dilute the urine and increase urine production, which can help to flush out the kidney stones. Water is also important for maintaining overall hydration, which can prevent the formation of kidney stones in the first place. Juice, sugar drinks, and milk do not have the same hydrating effect as water and may not provide the same benefits for passing kidney stones.Rate this question:
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- 7.
Concentrated urine results when ….
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The fluid intake is low.
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The liquid intake far exceeds the losses.
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The tubular fluid reabsorption is low.
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The kidneys release too much water into the urine.
Correct Answer
A. The fluid intake is low.Explanation
When the fluid intake is low, the body tries to conserve water by producing concentrated urine. This is because the kidneys reabsorb more water from the tubular fluid, resulting in less water being excreted in the urine. As a result, the urine becomes more concentrated with waste products and less diluted with water.Rate this question:
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- 8.
Bowman’s capsule and Convoluted tubules always lie within the ___
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Renal pelvis
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Renal medulla
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Renal cortex
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Cortex and medulla
Correct Answer
A. Renal cortexExplanation
Bowman's capsule and convoluted tubules always lie within the renal cortex. The renal cortex is the outer region of the kidney, which contains the glomeruli (where filtration occurs) and the convoluted tubules (where reabsorption and secretion occur). The renal pelvis is the innermost part of the kidney, where urine collects before it is transported to the bladder. The renal medulla is the inner region of the kidney, which contains the renal pyramids and the loop of Henle. Therefore, the correct answer is renal cortex.Rate this question:
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- 9.
A person who has control of urination can consciously and voluntarily decide whether to release the urine from the bladder or to hold it for a while. When the decision is made to urinate, the ........
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Sphincter muscle relaxes.
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Bladder expands like an elastic sac.
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Bladder wall relaxes.
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Muscles in the abdominal wall relax.
Correct Answer
A. Sphincter muscle relaxes.Explanation
When a person decides to urinate, the sphincter muscle, which is responsible for controlling the release of urine from the bladder, relaxes. This allows the urine to flow out of the bladder and through the urethra. The relaxation of the sphincter muscle is a voluntary action that occurs when the person consciously decides to empty their bladder.Rate this question:
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- 10.
The average volume of blood passes through the kidney per minute is about …..
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1.2L
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2.4L
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3L
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4.6L
Correct Answer
A. 1.2LExplanation
The correct answer is 1.2L because the average volume of blood that passes through the kidney per minute is approximately 1.2 liters. This is an important function of the kidney as it helps filter waste products and excess fluid from the blood, maintaining the body's overall fluid balance.Rate this question:
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- 11.
In hot weather the skin blood vessels …..
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Become narrower.
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Become wider.
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Are not affected.
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Allow less heat to be lost.
Correct Answer
A. Become wider.Explanation
In hot weather, the body tries to cool down by increasing blood flow to the skin. This is done by widening the skin blood vessels, allowing more blood to flow near the surface of the skin. This increased blood flow helps to dissipate heat from the body to the environment, allowing for better cooling. Therefore, the correct answer is "Become wider."Rate this question:
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- 12.
The figure below represents the functional unit of the kidney. What are structures (1), (2), (3) and 4 respectively?
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Bowman’s capsule / nephron / renal vein / loop of Henley
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Bowman’s capsule / glomerulus / renal artery / renal tubules
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Blood capillaries / Bowman’s capsule / aorta / renal tubules
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Blood capillaries / Bowman’s capsule / renal artery / loop of Henley
Correct Answer
A. Blood capillaries / Bowman’s capsule / renal artery / loop of HenleyExplanation
The figure represents the functional unit of the kidney, which is the nephron. Structure (1) is the Bowman's capsule, structure (2) is the glomerulus (a network of blood capillaries), structure (3) is the renal artery, and structure (4) is the loop of Henle. Therefore, the correct answer is "Blood capillaries / Bowman's capsule / renal artery / loop of Henley."Rate this question:
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- 13.
The amount of blood pumped by the heart per day is about …..
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1200L
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1600L
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6400L
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10000L
Correct Answer
A. 6400LExplanation
The correct answer is 6400L because the average adult heart pumps about 5 liters of blood per minute. In a day, there are 24 hours, which is equal to 1440 minutes. Therefore, the total amount of blood pumped by the heart per day is 5 liters/minute x 1440 minutes/day = 7200 liters/day.Rate this question:
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- 14.
Of the total blood volume, ……. Liters of plasma are examined by the kidney hundreds of times per day.
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2
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4.5
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3
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5.6
Correct Answer
A. 3Explanation
The correct answer is 3 because the kidney examines approximately 3 liters of plasma per day.Rate this question:
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- 15.
What will happen if there is no tubular reabsorption in the nephrons of kidney?
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The useful things would get off from the body with urine.
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Useful materials get into capillaries again and the body will reuse them for further processes.
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Urea accumulates in the blood.
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Most of Na and Cl get into the blood again.
Correct Answer
A. The useful things would get off from the body with urine.Explanation
If there is no tubular reabsorption in the nephrons of the kidney, the useful materials that were filtered out of the blood would not be reabsorbed back into the capillaries. Instead, they would be eliminated from the body through urine. This would result in the loss of important substances that the body needs for various processes.Rate this question:
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- 16.
The kidneys receive about ….. % of the cardiac output daily.
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10
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25
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35
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50
Correct Answer
A. 25Explanation
The kidneys receive about 25% of the cardiac output daily. This means that approximately one-quarter of the blood pumped by the heart is directed to the kidneys for filtration and waste removal. The kidneys play a vital role in maintaining the body's fluid balance, electrolyte levels, and removing waste products from the blood. This high percentage of cardiac output to the kidneys highlights their importance in maintaining overall body homeostasis.Rate this question:
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- 17.
What happens when kidneys stop filtering?
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Waste products stay in the blood
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Excess fluid in the body accumulate in blood
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Urine production falls.
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All of them.
Correct Answer
A. All of them.Explanation
When kidneys stop filtering, waste products are not removed from the blood, resulting in waste products staying in the blood. Additionally, excess fluid in the body accumulates in the blood because the kidneys are not able to remove it through urine production. Therefore, all of the given options are correct.Rate this question:
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- 18.
The hollow space at the center of kidney where urine is collected after its formation is called …..
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Renal pelvis
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Ureter
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Primary convoluted tubule
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Urethra
Correct Answer
A. Renal pelvisExplanation
The correct answer is renal pelvis. The renal pelvis is the hollow space at the center of the kidney where urine is collected after its formation. It is a funnel-shaped structure that is connected to the ureter, which carries the urine from the kidney to the bladder. The renal pelvis acts as a reservoir for urine before it is transported out of the body.Rate this question:
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- 19.
The principal nitrogenous excretory compound in humans is synthesized ……
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In the liver but eliminated mostly through kidneys.
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In kidneys but eliminated mostly through liver.
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In kidneys as well as eliminated by kidneys.
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In liver and also eliminated by the liver through bile.
Correct Answer
A. In the liver but eliminated mostly through kidneys.Explanation
The principal nitrogenous excretory compound in humans is synthesized in the liver, specifically in hepatocytes. This compound, called urea, is formed through a series of enzymatic reactions known as the urea cycle. Once synthesized, urea is transported to the kidneys through the bloodstream, where it is filtered out of the blood and excreted in urine. While a small amount of urea may also be eliminated through the liver via bile, the majority is excreted by the kidneys.Rate this question:
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- 20.
The poisonous soluble materials are transformed into non-soluble ones by the ….
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Skin
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Lungs
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Liver
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Gall bladder
Correct Answer
A. LiverExplanation
The liver is responsible for detoxifying harmful substances in the body, including poisonous soluble materials. It does this by converting these substances into non-soluble forms that can be safely eliminated from the body. The liver plays a crucial role in maintaining the body's overall health and protecting it from the harmful effects of toxins.Rate this question:
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- 21.
In which of the following are the largest amounts of nitrogen excreted from a mammalian body?
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Breath
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Sweat
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Urine
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Feces
Correct Answer
A. UrineExplanation
Urine is the correct answer because it is the primary way in which nitrogenous waste is excreted from the mammalian body. Nitrogen is mainly excreted in the form of urea, which is produced in the liver and transported to the kidneys to be eliminated through urine. While small amounts of nitrogen can also be excreted through sweat and feces, the largest amount is excreted through urine. Breath does not play a significant role in nitrogen excretion.Rate this question:
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- 22.
Which vessel carries blood to the kidneys?
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Renal Vein
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Renal Artery
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Both renal artery and renal vein
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Hepatic artery
Correct Answer
A. Renal ArteryExplanation
The renal artery carries blood to the kidneys. The kidneys are responsible for filtering waste products and excess water from the blood, so it is necessary for blood to be transported to the kidneys for this process to occur. The renal artery branches off from the abdominal aorta and delivers oxygenated blood to the kidneys. Once the blood has been filtered, it is then carried away from the kidneys by the renal vein. In this question, the correct answer is the renal artery because it specifically asks which vessel carries blood to the kidneys.Rate this question:
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- 23.
Which of the following statements is incorrect?
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The kidney is differentiated into an outer narrow cortex and an inner broad medulla.
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Bowman’s capsule together with the renal tubules is found in the cortex of the kidney.
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The second coiled tubule joins the collecting duct which opens in a concave cavity called the pelvis.
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During urination the urinary bladder together with the sphincter muscle contract.
Correct Answer
A. During urination the urinary bladder together with the sphincter muscle contract.Explanation
During urination, the urinary bladder contracts to expel urine, while the sphincter muscle relaxes to allow the urine to flow out. Therefore, the given statement is incorrect as it states that both the urinary bladder and the sphincter muscle contract during urination.Rate this question:
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- 24.
The artificial kidney contains a fluid which is almost the same as plasma except that it has ……
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No urea and metabolic wastes
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High glucose
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High uric acid
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No minerals
Correct Answer
A. No urea and metabolic wastesExplanation
The artificial kidney is designed to perform the functions of a natural kidney, which includes filtering waste products from the blood. Urea and metabolic wastes are the byproducts of metabolism that need to be removed from the body. Therefore, the artificial kidney contains a fluid that is similar to plasma but does not contain urea and metabolic wastes, allowing it to effectively filter these substances from the blood.Rate this question:
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- 25.
Each kidney contains about ……… uriniferous tubules.(The uriniferous tubule is the first coiled tubule together with the loop of Henle and the second coiled tubule)
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10,000
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5,000
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500,000
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1000,000
Correct Answer
A. 1000,000Explanation
Each kidney contains about 1,000,000 uriniferous tubules. The uriniferous tubules consist of the first coiled tubule, the loop of Henle, and the second coiled tubule. These tubules are responsible for the filtration, reabsorption, and secretion processes that occur in the kidneys, allowing for the formation of urine. The large number of tubules in each kidney highlights the efficiency and capacity of the kidneys to filter and process waste products from the blood.Rate this question:
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- 26.
Less filtration and more reabsorption occurs when there is .....
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Shortage of water
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Excess of water
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Normal quantity of water
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High water absorption from the intestine
Correct Answer
A. Shortage of waterExplanation
When there is a shortage of water, the body tries to conserve as much water as possible. This is done by reducing the amount of water that is filtered out of the blood by the kidneys and increasing the amount of water that is reabsorbed back into the bloodstream. This helps to prevent dehydration and maintain the body's water balance.Rate this question:
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- 27.
Place the following events in sequence ….. A) Fluid passes through the ureters B) Reabsorption in renal tubules C) Filtration in Bowman’s capsule D) Urine enters the urethra
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C, B, A, D
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C, B, D, A
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B, C, A, D
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A, C, D, B
Correct Answer
A. C, B, A, DExplanation
First, filtration occurs in Bowman's capsule, where waste products and excess water are filtered out of the blood. Then, reabsorption takes place in the renal tubules, where useful substances such as glucose and ions are reabsorbed back into the blood. After that, fluid passes through the ureters, which are tubes that transport urine from the kidneys to the bladder. Finally, urine enters the urethra, which is the tube that carries urine out of the body. Therefore, the correct sequence is C, B, A, D.Rate this question:
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- 28.
Blood being pumped to the kidneys and then filtered by nephrons is an example of two systems working together, ........
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Circulatory and muscular
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Nervous and muscular
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Excretory and circulatory
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Nervous and excretory
Correct Answer
A. Excretory and circulatoryExplanation
Blood being pumped to the kidneys and then filtered by nephrons is an example of the excretory and circulatory systems working together. The circulatory system is responsible for pumping blood throughout the body, including to the kidneys. The excretory system, specifically the kidneys, filters waste products from the blood and produces urine. Therefore, the two systems are working in conjunction to remove waste from the body.Rate this question:
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- 29.
The amount of blood pumped by the heart in one minute, is examined by the kidneys every …… minute(s).
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1
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2
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3
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4
Correct Answer
A. 4Explanation
The kidneys examine the amount of blood pumped by the heart in one minute every 4 minutes.Rate this question:
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- 30.
The liver (one of the excretory organs) breaks down the excess of……. forming ……..
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Amino acids, urea
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Glucose, carbon dioxide
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Cellulose, glucose
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Proteins, amino acids
Correct Answer
A. Amino acids, ureaExplanation
The liver is responsible for breaking down excess proteins into amino acids. These amino acids are then further metabolized in the liver to form urea, which is a waste product that is excreted by the kidneys. Therefore, the correct answer is amino acids, urea.Rate this question:
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- 31.
If fibrosis of the human kidney occurs and a great number of nephrons do not work, this leads to …….
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Increase in the percentage of glucose in urine
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Increase in urine volume
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Increase in the percentage of salts in urine
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Increase in the percentage of urea in blood
Correct Answer
A. Increase in the percentage of urea in bloodExplanation
If fibrosis of the human kidney occurs and a great number of nephrons do not work, this leads to an increase in the percentage of urea in the blood. Urea is a waste product that is normally filtered out by the kidneys and excreted in urine. When the kidneys are not functioning properly, they are unable to effectively remove urea from the blood, causing its concentration to increase. This can lead to a condition called uremia, which is characterized by high levels of urea in the blood.Rate this question:
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- 32.
The liver excretes ……
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Sodium chloride
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Poisonous substances
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Volatile substances
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Digestive enzymes
Correct Answer
A. Poisonous substancesExplanation
The liver is responsible for metabolizing and detoxifying various substances in the body, including poisonous substances. It does this by breaking down these substances into less harmful compounds that can be eliminated from the body through urine or bile. The liver plays a crucial role in maintaining the body's overall health and preventing the accumulation of harmful toxins.Rate this question:
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- 33.
Excretory substances which are filtered from the blood to the artificial kidney, depends on the …..… phenomenon.
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Diffusion
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Osmosis
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Selective permeability
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Active transport
Correct Answer
A. DiffusionExplanation
Excretory substances are filtered from the blood to the artificial kidney through the process of diffusion. Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. In the artificial kidney, the excretory substances in the blood, such as waste products and excess ions, move across a semipermeable membrane to the dialysate solution, which has a lower concentration of these substances. This movement occurs due to the concentration gradient between the blood and the dialysate, allowing the excretory substances to be removed from the blood through diffusion.Rate this question:
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- 34.
For a renal failure patient, the blood moves from the ……. to the artificial kidney.
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Heart
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Vein
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Blood capillaries
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Artery
Correct Answer
A. ArteryExplanation
In a renal failure patient, the blood moves from the artery to the artificial kidney. This is because arteries carry oxygenated blood away from the heart and towards the various organs and tissues in the body. In the case of a renal failure patient, the blood needs to be filtered and purified by the artificial kidney, so it is necessary for the blood to be transported from the artery to the artificial kidney for this process to occur.Rate this question:
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- 35.
The uric acid is produced during the breakdown of ……..
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Lipids
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Carbohydrates
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Nucleotides
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All of them
Correct Answer
A. NucleotidesExplanation
Uric acid is produced during the breakdown of nucleotides. Nucleotides are the building blocks of DNA and RNA, and when they are broken down, one of the byproducts is uric acid. Lipids and carbohydrates do not directly contribute to the production of uric acid.Rate this question:
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- 36.
The functional excretory unit in human’s skin is the …..
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Hair follicle
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Sweat gland
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Sweat pore
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Sebaceous gland
Correct Answer
A. Sweat glandExplanation
The functional excretory unit in human's skin is the sweat gland. Sweat glands are responsible for producing and excreting sweat, which helps regulate body temperature and remove waste products from the body. Hair follicles are not directly involved in excretion, but they do play a role in hair growth. Sweat pores are the openings through which sweat is released onto the skin surface. Sebaceous glands are responsible for producing sebum, an oily substance that lubricates the skin and hair.Rate this question:
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- 37.
Kidneys are thin and long in …..
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Rabbit
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Elephant
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Horse
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Frog
Correct Answer
A. FrogExplanation
Frogs have thin and long kidneys, which help them in filtering waste products from their blood and producing urine. This is because frogs are amphibians and live both in water and on land, so they need efficient kidneys to maintain their water balance. In contrast, rabbits, elephants, and horses have kidneys that are not specifically adapted for aquatic environments and may have different shapes and sizes.Rate this question:
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- 38.
The loop of Henle is present inside the ….. of the kidney
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Cortex
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Medulla
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Ureter
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Pelvis
Correct Answer
A. MedullaExplanation
The loop of Henle is present inside the medulla of the kidney. The medulla is the innermost region of the kidney, located between the renal cortex and the renal pelvis. It is responsible for the reabsorption of water and electrolytes from the filtrate, helping to concentrate the urine. The loop of Henle is a crucial part of the nephron, the functional unit of the kidney, and plays a vital role in maintaining the body's water and electrolyte balance.Rate this question:
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- 39.
Hemodialysis (artificial kidney) rids your body of harmful wastes. What else does hemodialysis remove?
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A. Extra protein
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B. Extra salt
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C. Extra water
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D. B and C
Correct Answer
A. D. B and CExplanation
Hemodialysis is a process that uses an artificial kidney to remove harmful wastes from the body. In addition to removing wastes, it also helps remove extra salt and extra water from the body. This is important because individuals with kidney failure often have difficulty regulating fluid and electrolyte balance. By removing excess salt and water, hemodialysis helps to maintain a healthier fluid balance in the body.Rate this question:
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- 40.
Immuno-suppressant drugs are taken ______.
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With hemodialysis
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With a kidney transplant
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With major Bacteria
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With major viruses
Correct Answer
A. With a kidney transplantExplanation
Immuno-suppressant drugs are taken with a kidney transplant because after a kidney transplant, the body's immune system may recognize the new kidney as a foreign object and try to attack it. Immuno-suppressant drugs help to suppress the immune system and prevent it from rejecting the transplanted kidney. These drugs are necessary to ensure the success and long-term survival of the transplanted organ.Rate this question:
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- 41.
The liquid which collects in Bowman’s capsule is _____
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Blood plasma minus proteins
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Concentrated urine
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Glycogen and water
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Urea, proteins and water
Correct Answer
A. Blood plasma minus proteinsExplanation
The liquid that collects in Bowman's capsule is the filtrate from the blood. This filtrate is formed by the process of ultrafiltration in the glomerulus, where small molecules such as water, ions, glucose, amino acids, and waste products like urea are filtered out of the blood. However, larger molecules like proteins are not filtered and remain in the blood. Therefore, the liquid in Bowman's capsule is blood plasma minus proteins.Rate this question:
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- 42.
When the body temperature rises above normal, .....
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Blood flow to the skin decreases
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Vasoconstriction occurs
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Blood flow to the skin increases
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Sweat gland activity decreases
Correct Answer
A. Blood flow to the skin increasesExplanation
When the body temperature rises above normal, blood flow to the skin increases. This is because the body needs to dissipate heat and cool down. Increasing blood flow to the skin helps in transferring heat from the core of the body to the skin surface, where it can be released into the environment through sweating and radiation. This process is known as vasodilation, where the blood vessels in the skin dilate to allow more blood to flow through them, increasing heat loss and promoting cooling of the body.Rate this question:
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- 43.
What makes up the shaft of a hair?
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Living dermal cells.
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Dead dermal cells.
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Living epidermal cells.
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Dead epidermal cells.
Correct Answer
A. Dead epidermal cells.Explanation
The shaft of a hair is made up of dead epidermal cells. The shaft is the visible part of the hair that extends above the surface of the skin. The epidermis is the outermost layer of the skin, and it is composed of multiple layers of cells. As new cells are produced in the hair follicle, they push older cells up to the surface, where they eventually die and become part of the hair shaft. These dead epidermal cells are responsible for giving the hair its strength and structure.Rate this question:
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- 44.
The _____ acts as an insulator for the body?
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Hypodermis
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Epidermis
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Sebaceous gland
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Dermis
Correct Answer
A. HypodermisExplanation
The hypodermis acts as an insulator for the body because it is the innermost layer of the skin and contains adipose tissue, which helps to regulate body temperature by providing insulation. Additionally, the hypodermis also helps to cushion and protect the underlying structures of the body.Rate this question:
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- 45.
If the concentration of glucose in the renal artery is 90 mg/100 ml of fluid, then what is the glucose concentration in each of the glomerular filtrate (GF), the urine and the renal vein (RV)?
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GF 90 / urine zero / RV 90
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GF 90 / urine 40 / RV 50
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GF 50 / urine 50 / RV 40
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GF 50 / urine 40 / RV 50
Correct Answer
A. GF 90 / urine zero / RV 90Explanation
The glomerular filtrate (GF) is the fluid that is filtered from the renal artery into the renal tubules. Since the concentration of glucose in the renal artery is 90 mg/100 ml, the glucose concentration in the GF would also be 90 mg/100 ml. The urine does not contain any glucose, so the glucose concentration in the urine would be zero. The renal vein (RV) carries blood away from the kidneys, so the glucose concentration in the RV would be the same as in the renal artery, which is 90 mg/100 ml. Therefore, the correct answer is GF 90 / urine zero / RV 90.Rate this question:
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- 46.
Why is the right kidney slightly lower than the left one?
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Due to the larger size of the liver on the right side of the body.
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Because the kidneys lie behind the peritoneum that lines the abdominal cavity.
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Because the spleen is usually in contact with the left kidney.
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Because the right kidney develops in the pelvis and ascends up during the ninth week of embryonic development.
Correct Answer
A. Due to the larger size of the liver on the right side of the body.Explanation
The right kidney is slightly lower than the left one due to the larger size of the liver on the right side of the body. The liver occupies space in the abdominal cavity, pushing the right kidney down and causing it to be positioned lower than the left kidney.Rate this question:
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- 47.
Which graph represents the approximate proper concentration of red blood cells in each of the following structures: Renal artery (Ra), Glomerular filtrate (Gl), Renal vein (Rv) and Urine (Ur)?
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A
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D
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B
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C
Correct Answer
A. A -
- 48.
If circle (A) represents the liver, circle (B) represents the kidney while circle (C) represents the skin, then what are the excretory substances represented by (X) and (Y) respectively?
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Water and mineral salts
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Mineral salts and water
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Toxic substances and nitrogenous wastes
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Nitrogenous wastes and toxic substances
Correct Answer
A. Toxic substances and nitrogenous wastesExplanation
Circle (A) represents the liver, which is responsible for detoxifying harmful substances in the body. Therefore, (X) is most likely representing toxic substances. Circle (B) represents the kidney, which filters waste products from the blood, including nitrogenous wastes. Therefore, (Y) is most likely representing nitrogenous wastes.Rate this question:
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- 49.
The circles shown below represent different excretory organs, where each two organs share a common excretory product. What do the circles (1), (2), (3) and (4) represent respectively?
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Skin / lung / kidney /liver
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Lung / kidney / skin / liver
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Liver / kidney / lung / skin
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Kidney / liver / lung / skin
Correct Answer
A. Skin / lung / kidney /liver -
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