1.
What are the product of photosynthesis
Correct Answer
C. Oxygen and sugars
Explanation
Photosynthesis is the process by which plants convert sunlight, carbon dioxide, and water into oxygen and glucose (sugars). Oxygen is released into the atmosphere as a byproduct, while glucose is used by the plant for energy and growth. Therefore, the correct answer is "oxygen and sugars."
2.
What happens during photosynthesis
Correct Answer
B. The cell uses the energy in sunlight to make food
Explanation
During photosynthesis, the cell uses the energy in sunlight to convert carbon dioxide and water into glucose and oxygen. This process takes place in the chloroplasts of plant cells, where chlorophyll pigments capture sunlight and convert it into chemical energy. This energy is then used to combine carbon dioxide and water, producing glucose as a form of stored energy and releasing oxygen as a byproduct. Therefore, the correct answer is "the cell uses the energy in sunlight to make food."
3.
How does photosynthesis benefit heterotrophs
Correct Answer
B. It creates food that they can eat
Explanation
Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into glucose and oxygen. Heterotrophs, such as animals and humans, cannot produce their own food and rely on consuming other organisms for energy. Therefore, photosynthesis benefits heterotrophs by producing food (glucose) that they can consume and obtain energy from. This process forms the foundation of the food chain, providing nourishment for all heterotrophic organisms.
4.
What happens during respiration
Correct Answer
B. Glucose is broken down, releasing energy
Explanation
During respiration, glucose is broken down in the cells of the body, which releases energy. This process occurs in the presence of oxygen and is known as aerobic respiration. Glucose molecules are broken down into smaller molecules, such as carbon dioxide and water, and energy is released in the form of ATP (adenosine triphosphate). This energy is used by cells for various functions and activities.
5.
The stage of respiration that releases most of the energy in glucose occurs in the
Correct Answer
C. Mitochondria
Explanation
The stage of respiration that releases most of the energy in glucose occurs in the mitochondria. This is because the mitochondria are the powerhouse of the cell and are responsible for producing ATP, the energy currency of the cell. During cellular respiration, glucose is broken down into carbon dioxide and water, and the majority of ATP is generated in the mitochondria through a series of chemical reactions. Therefore, the mitochondria play a crucial role in releasing energy from glucose.
6.
How are photosynthesis and respiration related
Correct Answer
A. They have opposite equations
Explanation
Photosynthesis and respiration are related because they have opposite equations. Photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen, while respiration is the process by which organisms break down glucose and oxygen to produce carbon dioxide, water, and energy. The equations for these processes are essentially the reverse of each other, making them interconnected and dependent on each other for the cycling of carbon and oxygen in the ecosystem.
7.
Together, respiration and photosynthesis keep the levels of carbon dioxide and oxygen in the atmosphere
Correct Answer
A. Fairly constant
Explanation
Respiration is the process by which living organisms release carbon dioxide into the atmosphere, while photosynthesis is the process by which plants absorb carbon dioxide and release oxygen. These two processes work together to maintain a balance in the levels of carbon dioxide and oxygen in the atmosphere. While there are fluctuations in these levels due to various factors, overall, respiration and photosynthesis help to keep the levels of carbon dioxide and oxygen fairly constant in the atmosphere.
8.
The energy releasing process that does not require oxygen is called
Correct Answer
C. Fermentation
Explanation
Fermentation is the energy-releasing process that does not require oxygen. During fermentation, glucose is broken down into simpler compounds, such as ethanol or lactic acid, in the absence of oxygen. This process is commonly used in the production of alcoholic beverages, bread, and yogurt.
9.
Under which of the following conditions is lactic acid fermentation most likely to occur
Correct Answer
A. A very fast run
Explanation
Lactic acid fermentation is most likely to occur during a very fast run. During intense exercise, the body requires energy at a rapid rate. When the oxygen supply to the muscles cannot keep up with the demand, the body switches to anaerobic metabolism, resulting in the production of lactic acid. This process helps to generate energy quickly, but also leads to the accumulation of lactic acid in the muscles, causing fatigue and muscle soreness.
10.
Carbon dioxide enters plants through the
Correct Answer
C. Stomata
Explanation
Plants take in carbon dioxide through small openings on their leaves called stomata. Stomata are responsible for the exchange of gases in plants, allowing carbon dioxide to enter and oxygen to exit. Carbon dioxide is necessary for photosynthesis, the process by which plants convert sunlight, water, and carbon dioxide into glucose and oxygen. Chlorophyll, on the other hand, is a pigment found in the chloroplasts of plant cells that absorbs sunlight and plays a crucial role in photosynthesis. While chlorophyll is essential for capturing light energy, it does not directly facilitate the entry of carbon dioxide into plants.
11.
In which of these does alcoholic fermentation occur
Correct Answer
C. Lactic acid
12.
Plants use energy from the sun to produce carbon dioxide and sugars
Correct Answer
B. False
Explanation
Plants use energy from the sun to produce oxygen and sugars through the process of photosynthesis, not carbon dioxide.
13.
Plants use energy from the sun to produce _________________________ and sugars
1. sunlight
2.oxygen
3.stomata
Correct Answer
oxygen
Explanation
Plants use energy from the sun to produce oxygen and sugars. Oxygen is a byproduct of photosynthesis, the process by which plants convert sunlight into energy. This oxygen is released into the atmosphere and is essential for the survival of many organisms, including humans. Sugars, on the other hand, are produced through the conversion of carbon dioxide and water using the energy from sunlight. These sugars serve as a source of energy for the plant's growth and development.
14.
A heterotroph is an organism that cannot make its own food
Correct Answer
A. True
Explanation
A heterotroph is an organism that relies on consuming other organisms or organic matter for its energy and nutrients. Unlike autotrophs, which can produce their own food through processes like photosynthesis, heterotrophs are unable to synthesize their own food molecules. They must obtain their energy by consuming other organisms or organic matter. Therefore, the statement that a heterotroph cannot make its own food is true.
15.
Photosynthesis and respiration form a cycle that keeps the levels of water and carbon dioxide fairly constant in the atmosphere
Correct Answer
B. False
Explanation
The statement is false because photosynthesis and respiration do not form a cycle that keeps the levels of water and carbon dioxide fairly constant in the atmosphere. While photosynthesis removes carbon dioxide from the atmosphere and releases oxygen, respiration does the opposite by consuming oxygen and releasing carbon dioxide. This creates a balance between the two processes, but it does not keep the levels of water and carbon dioxide constant in the atmosphere. Other factors such as human activities and natural processes also influence the levels of these gases in the atmosphere.
16.
Photosynthesis and respiration form a cycle that keeps the levels of __________ and carbon dioxide fairly constant in the atmosphere
1. oxygen
2.respiration
3. water
Correct Answer
oxygen
Explanation
Photosynthesis is the process by which plants convert carbon dioxide and sunlight into oxygen and glucose. On the other hand, respiration is the process by which organisms release carbon dioxide and use oxygen to produce energy. These two processes are interconnected and form a cycle. During photosynthesis, plants produce oxygen and absorb carbon dioxide, while during respiration, organisms consume oxygen and release carbon dioxide. This cycle helps to maintain the levels of oxygen and carbon dioxide fairly constant in the atmosphere. Therefore, the correct answer is oxygen.
17.
The raw materials for respiration are the opposite of the end products for photosynthesis
Correct Answer
B. False
Explanation
The statement is false because the raw materials for respiration, which are glucose and oxygen, are also the raw materials for photosynthesis. In photosynthesis, glucose and oxygen are produced as end products, while in respiration, these same substances are used as raw materials to produce energy. Therefore, the raw materials for respiration and the end products for photosynthesis are not opposite, but rather the same.
18.
The raw materials for respiration are the _______________ the end products for photosynthesis
1.same of
2.different
3.opposite
Correct Answer
same of
Explanation
The correct answer is "same of". This means that the raw materials for respiration are the same as the end products for photosynthesis. This is because respiration and photosynthesis are interconnected processes in which plants use carbon dioxide and water to produce glucose and oxygen during photosynthesis, and then use glucose and oxygen to produce carbon dioxide and water during respiration. Therefore, the raw materials for respiration are the same substances that are produced as end products during photosynthesis.
19.
When muscle cells run low on oxygen lactic acid fermentation take place
Correct Answer
A. True
Explanation
When muscle cells run low on oxygen, lactic acid fermentation takes place. This is because during intense exercise or when there is insufficient oxygen supply, muscle cells switch from aerobic respiration to anaerobic respiration. In anaerobic respiration, glucose is broken down into lactic acid, which helps produce energy for the muscles. This process allows the muscles to continue functioning temporarily without oxygen, but it also leads to the accumulation of lactic acid, causing muscle fatigue and soreness. Therefore, the statement that lactic acid fermentation takes place when muscle cells run low on oxygen is true.
20.
Small openings called______________________allow carbon dioxide to enter a leaf.
Correct Answer
stomata
Explanation
Stomata are small openings found on the surface of leaves that allow gases, including carbon dioxide, to enter and exit the leaf. These openings are surrounded by specialized cells called guard cells, which can open and close the stomata to regulate gas exchange and prevent excessive water loss. Through the process of photosynthesis, carbon dioxide enters the leaf through the stomata and is used by the plant to produce glucose and oxygen. Therefore, stomata play a crucial role in the gas exchange and carbon dioxide uptake by plants.
21.
Plants make their own food using energy that comes from the ________________
Correct Answer
sunlight
Explanation
Plants have a process called photosynthesis, where they convert sunlight into energy through the use of chlorophyll in their cells. This energy is then used to produce glucose, which is the plant's food source. Therefore, sunlight is essential for plants to carry out photosynthesis and create their own food.
22.
Almost all living things depend on the process of ________________________ to supply them with the energy they need
Correct Answer
photosynthesis
Explanation
Almost all living things, including plants and some microorganisms, depend on the process of photosynthesis to supply them with the energy they need. Photosynthesis is the process by which green plants and some other organisms use sunlight, carbon dioxide, and water to produce glucose (a form of sugar) and oxygen. This glucose is then used as a source of energy by living organisms through cellular respiration. Without photosynthesis, living things would not have a direct source of energy and the food chain would collapse.
23.
During respiration, molecules of _______________ are first broken down in the cytoplasm
Correct Answer
sugar
Explanation
During respiration, molecules of sugar are first broken down in the cytoplasm. This is because sugar is a source of energy for cells, and the process of respiration involves breaking down sugar molecules into smaller units called ATP (adenosine triphosphate). This breakdown occurs in the cytoplasm, which is the fluid-filled region of the cell where many cellular processes take place. The ATP molecules produced through this process are then used by the cell to carry out various functions and activities.
24.
Energy from glucose is released in the process of _____________
Correct Answer
respiration
Explanation
The process of respiration involves the breakdown of glucose molecules to release energy. This energy is used by cells to carry out various functions. During respiration, glucose is oxidized and converted into carbon dioxide and water, releasing energy in the form of ATP (adenosine triphosphate). This energy is essential for the survival and functioning of living organisms. Therefore, the correct answer is respiration.
25.
The main difference between respiration and fermentation is that respiration uses ____________ to obtain energy from food
Correct Answer
oxygen
Explanation
Respiration and fermentation are two different processes that organisms use to obtain energy from food. The main difference between them is that respiration requires the presence of oxygen, while fermentation does not. During respiration, oxygen is used to break down food molecules and release energy in the form of ATP. In contrast, fermentation occurs in the absence of oxygen and involves the breakdown of food molecules without the use of oxygen. Therefore, the correct answer is oxygen.
26.
The process in which yeasts break down sugars and produce carbon dioxide and alcohol is called _____________
fermentation
Correct Answer
alcoholic
Explanation
The process in which yeasts break down sugars and produce carbon dioxide and alcohol is called alcoholic fermentation. During this process, yeasts convert sugars into alcohol and release carbon dioxide as a byproduct. This process is commonly used in the production of alcoholic beverages such as beer and wine. Alcoholic fermentation is an important biological process that allows yeasts to generate energy in the absence of oxygen.
27.
The products of respiration are energy, carbon dioxide, and ______________
Correct Answer
water
Explanation
During respiration, the breakdown of glucose molecules releases energy. Carbon dioxide is also produced as a waste product. Additionally, water is formed as a byproduct of respiration when oxygen combines with hydrogen ions. Therefore, the correct answer is water.
28.
Chloroplasts contain a pigment called _____________ that captures the energy in light
Correct Answer
chlorophyll
Explanation
Chloroplasts are responsible for photosynthesis in plants, and chlorophyll is the pigment that captures the energy from sunlight. It is located within the thylakoid membranes of the chloroplasts and is essential for converting light energy into chemical energy, which is used to produce glucose and oxygen. Chlorophyll absorbs light in the red and blue regions of the electromagnetic spectrum, reflecting green light, giving plants their characteristic green color. Thus, chlorophyll plays a crucial role in capturing light energy and initiating the process of photosynthesis.