Secondary Biology Test Questions & Answers

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Secondary Biology Test Questions & Answers - Quiz

Ever wondered how does the absorption of water and minerals by plants take place? What are trace elements? Check out the online quiz to test yourself and enhance your knowledge along the way.


Questions and Answers
  • 1. 

    Which of the following nutrients are obtained from the atmosphere and soil by plants?

    • A.

      Ca, S, Fe

    • B.

      Na, P, K

    • C.

      C, H, O

    • D.

      B, Cl, Mb, Zn

    Correct Answer
    C. C, H, O
    Explanation
    Plants obtain nutrients from the atmosphere and soil in order to carry out photosynthesis and other metabolic processes. Carbon (C), hydrogen (H), and oxygen (O) are the three main elements that plants derive from the air and water to produce carbohydrates, lipids, and other essential molecules. These nutrients are essential for plant growth and development.

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  • 2. 

    Which of the following nutrients are considered micronutrients?

    • A.

      B, Mn, Cl, Zn

    • B.

      C, N, P, K

    • C.

      Ca, Mg, S, Fe

    • D.

      C, H, K, Mg

    Correct Answer
    A. B, Mn, Cl, Zn
  • 3. 

    Trace elements are the same as ……

    • A.

      Macronutrients

    • B.

      Micronutrients

    • C.

      Atmospheric nutrients

    • D.

      Secondary Nutrients

    Correct Answer
    B. Micronutrients
    Explanation
    Trace elements are also known as micronutrients. These are essential nutrients required by plants in small quantities for their growth and development. Macronutrients, on the other hand, are required in larger quantities. Atmospheric nutrients and secondary nutrients are not synonymous with trace elements.

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  • 4. 

    Which of the followings is trace element?

    • A.

      Ca

    • B.

      K

    • C.

      Mg

    • D.

      Cu

    Correct Answer
    D. Cu
    Explanation
    Copper (Cu) is a trace element because it is required by the body in very small amounts for proper functioning. Trace elements are essential minerals that are needed in minute quantities for various physiological processes. Copper plays a crucial role in the formation of red blood cells, connective tissues, and the functioning of the immune system. It also acts as a cofactor for several enzymes involved in energy production and antioxidant defense.

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  • 5. 

    Which of the following elements is a macro-nutrient?

    • A.

      Mo

    • B.

      Cu

    • C.

      P

    • D.

      Al

    Correct Answer
    C. P
    Explanation
    Phosphorus (P) is a macro-nutrient because it is required by plants and animals in relatively large amounts for their growth and development. It plays a crucial role in various biological processes, such as energy transfer, DNA and RNA synthesis, and cell division. Phosphorus is a key component of ATP (adenosine triphosphate), which is the primary energy currency in cells. It is also an essential component of nucleic acids, phospholipids, and many other biomolecules. Therefore, P is considered a macro-nutrient due to its significant role in supporting life processes.

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  • 6. 

    How does water enter a plant?

    • A.

      Through the stomata

    • B.

      By active transport in root hair cells

    • C.

      By osmosis in root hair cells down (along) a water potential gradient

    • D.

      By osmosis in root hair cells up (against) a water potential gradient

    Correct Answer
    C. By osmosis in root hair cells down (along) a water potential gradient
    Explanation
    Water enters a plant through osmosis in root hair cells down (along) a water potential gradient. Root hair cells have a higher solute concentration than the surrounding soil, creating a lower water potential in the root hair cells. This difference in water potential causes water to move from an area of higher water potential in the soil to an area of lower water potential in the root hair cells. This movement of water through osmosis allows water to enter the plant and be transported to other parts of the plant.

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  • 7. 

    How do mineral ions enter a plant?

    • A.

      By imbibition through the roots

    • B.

      By active transport in root hair cells

    • C.

      By osmosis in root hair cells

    • D.

      Through the stomata

    Correct Answer
    B. By active transport in root hair cells
    Explanation
    Mineral ions enter a plant through active transport in root hair cells. Active transport is a process that requires energy to move substances against their concentration gradient. In this case, the root hair cells actively transport mineral ions from the soil into the plant's root system. This allows the plant to absorb essential nutrients and minerals necessary for its growth and development. Imbibition, osmosis, and stomata are not the primary mechanisms through which mineral ions enter a plant.

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  • 8. 

    Which of the following substances would diffuse faster across the membrane?

    • A.

      Hydrophilic substances

    • B.

      Hydrophobic substances

    • C.

      Both hydrophilic and hydrophobic

    • D.

      Polar substances

    Correct Answer
    B. Hydrophobic substances
    Explanation
    Hydrophobic substances would diffuse faster across the membrane because they are nonpolar and can easily pass through the hydrophobic interior of the lipid bilayer. Hydrophilic substances, on the other hand, are polar and have difficulty crossing the hydrophobic barrier of the membrane. Polar substances may also have difficulty diffusing across the membrane due to their polarity. Therefore, hydrophobic substances have a higher likelihood of diffusing faster across the membrane.

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  • 9. 

    Assertion (A) “ belief ” : K+ ions accumulation found in Nitella depends on its respiratory activity.Reason (R): because absorption of all ions in plants depends on Osmotic Gradient.

    • A.

      A and R are true and R is the correct explanation of A

    • B.

      A and R are true but R is not the correct explanation of A

    • C.

      A is true but R is false

    • D.

      A is false but R is true

    Correct Answer
    C. A is true but R is false
    Explanation
    The correct answer is A is true but R is false. The assertion states that K+ ions accumulation found in Nitella depends on its respiratory activity. However, the reason given states that absorption of all ions in plants depends on Osmotic Gradient, which is not a correct explanation for the assertion.

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  • 10. 

    The first process by which water enters into the seed coat when a seed is placed in a suitable environment for germination is ........

    • A.

      Osmosis

    • B.

      Active transport

    • C.

      Absorption

    • D.

      Imbibition

    Correct Answer
    D. Imbibition
    Explanation
    Imbibition is the process by which water enters into the seed coat when a seed is placed in a suitable environment for germination. During imbibition, the seed absorbs water through its outer covering, the seed coat. This process occurs due to the difference in water potential between the seed and its surroundings, causing water molecules to move from an area of higher water potential to an area of lower water potential. Imbibition is an important initial step in seed germination as it provides the necessary hydration for the embryo to begin its growth and metabolic activities.

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  • 11. 

    Assertion: When dried seeds of pea are placed in a tin and water added up to their upper level and then a lid is put lightly over it. Within an hour, the lid will be blown off. Reason: Due to rapid cell division in pea seeds.

    • A.

      Both Assertion and Reason are true and Reason is the correct explanation of the Assertion. 

    • B.

      Assertion is false but the Reason happens actually.

    • C.

      Assertion is true, but Reason is false.

    • D.

      Both Assertion and Reason are false.

    Correct Answer
    C. Assertion is true, but Reason is false.
    Explanation
    The assertion states that when dried seeds of pea are placed in a tin and water is added up to their upper level, and then a lid is lightly put over it, within an hour, the lid will be blown off. This statement is true, as the process of germination in seeds involves the absorption of water, which leads to an increase in volume and pressure within the seed. However, the reason given for this phenomenon, which is rapid cell division in pea seeds, is false. The increase in pressure is actually caused by the absorption of water and the subsequent swelling of the seed, not rapid cell division.

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  • 12. 

    Inside root cells, water can take a route going from one cell wall to another cell wall, not entering the cytoplasm at any point by means of …..

    • A.

      Imbibition

    • B.

      Osmosis

    • C.

      Diffusion

    • D.

      Active transport

    Correct Answer
    A. Imbibition
    Explanation
    Inside root cells, water can take a route going from one cell wall to another cell wall, not entering the cytoplasm at any point. This process is known as imbibition, where water is absorbed by the cell walls and fills the spaces between them. Osmosis, diffusion, and active transport involve the movement of substances across the cell membrane and into the cytoplasm, which is not the case in this scenario. Therefore, the correct answer is imbibition.

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  • 13. 

    Which of the following statement is true regarding the movement of water?

    • A.

      Water is mainly pushed through the plant

    • B.

      Water is mainly pulled through the plant

    • C.

      Water moves through the plant by active transport

    • D.

      None of them

    Correct Answer
    B. Water is mainly pulled through the plant
    Explanation
    Water is mainly pulled through the plant. This is because of transpiration, which is the process in which water is evaporated from the leaves of the plant. As water evaporates, it creates a negative pressure or tension in the plant's xylem vessels, which pulls water up from the roots. This process is known as the cohesion-tension theory and is the main mechanism responsible for the movement of water in plants.

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  • 14. 

    Unlike water, minerals cannot be passively absorbed (except a few) by the roots because.....

    • A.

      Minerals are present in the soil as charged particles which cannot move across cell membrane

    • B.

      The concentration of minerals in the soil is usually lower than the concentration of minerals in the root

    • C.

      The two answers above are correct

    • D.

      None of them

    Correct Answer
    C. The two answers above are correct
    Explanation
    The correct answer is that the two answers above are correct. Minerals cannot be passively absorbed by the roots because they are present in the soil as charged particles which cannot move across the cell membrane. Additionally, the concentration of minerals in the soil is usually lower than the concentration of minerals in the root.

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  • 15. 

    Which of the following statements is true for diffusion?

    • A.

      Movement by diffusion is passive

    • B.

      Diffusion occurs over short distances

    • C.

      Not require the cell to expend energy.

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    Diffusion is a process in which molecules move from an area of higher concentration to an area of lower concentration. It is a passive process, meaning it does not require the cell to expend energy. Diffusion can occur over short distances, such as within a cell or between neighboring cells. Therefore, all of the given statements are true for diffusion.

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  • 16. 

    Over small distances, substances move by .....

    • A.

      Diffusion

    • B.

      Cytoplasmic streaming

    • C.

      Active transport

    • D.

      All of the above

    Correct Answer
    A. Diffusion
    Explanation
    Diffusion is the movement of substances from an area of higher concentration to an area of lower concentration. It occurs over small distances and does not require energy input. Therefore, it is the most suitable explanation for substances moving over small distances. Cytoplasmic streaming refers to the movement of cytoplasm within a cell, and active transport involves the movement of substances against their concentration gradient, both of which are not specific to small distances.

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  • 17. 

    Which of the following is the only means for gaseous movement within the plant body?

    • A.

      Diffusion

    • B.

      Osmosis

    • C.

      Both diffusion and osmosis

    • D.

      None of them

    Correct Answer
    A. Diffusion
    Explanation
    Diffusion is the only means for gaseous movement within the plant body because it is the process by which gases move from an area of high concentration to an area of low concentration. This movement allows gases, such as carbon dioxide and oxygen, to be transported between cells and tissues in plants. Osmosis, on the other hand, is the movement of water molecules across a semi-permeable membrane and is not directly involved in gaseous movement within plants. Therefore, the correct answer is diffusion.

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  • 18. 

    Root cells secrete hydrogen ions which are positively charged. Such ions can easily displace ………. that are bound to clay particulates.

    • A.

      Cl -

    • B.

      SO4 -2

    • C.

      K+

    • D.

      Both Cl - and SO4 -2

    Correct Answer
    C. K+
    Explanation
    Root cells secrete hydrogen ions which are positively charged. These hydrogen ions can easily displace other positively charged ions that are bound to clay particulates. The options given are Cl-, SO4-2, and K+. Since K+ is a positively charged ion, it is likely to be displaced by the hydrogen ions secreted by root cells. Therefore, the correct answer is K+.

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  • 19. 

    Three cells are put in three solutions (A, B and C) differ in their osmotic pressure. What are A, B and C?

    • A.

      C isotonic / B hypotonic / A hyper tonic

    • B.

      B hypertonic / C isotonic / A hypotonic

    • C.

      A isotonic / B hypotonic / C hypertonic

    • D.

      B hypertonic / C hypotonic / A isotonic

    Correct Answer
    D. B hypertonic / C hypotonic / A isotonic
  • 20. 

    Visking tubing is an artificial semi-permeable membrane tube (bag). In the experiment below, Solution R = 1% sucrose solution while Solution S = 3% sucrose solution. The experiment was left for 30 minutes. Predict the result of the experiment.

    • A.

      Water moves into the bag and the contents of the bag gain mass.

    • B.

      Water moves out of the bag and the contents of the bag lose mass.

    • C.

      Water moves out of the bag and the contents of the bag gain mass.

    • D.

      Water moves into the bag and the contents of the bag lose mass.

    Correct Answer
    B. Water moves out of the bag and the contents of the bag lose mass.
    Explanation
    In this experiment, the Visking tubing acts as a semi-permeable membrane. A semi-permeable membrane allows the passage of certain molecules or substances while restricting others. In this case, water can pass through the Visking tubing, but sucrose molecules cannot.

    Since the sucrose concentration is higher in Solution S (3%) compared to Solution R (1%), water molecules will move from an area of lower solute concentration (inside the bag) to an area of higher solute concentration (outside the bag) through osmosis. This means that water will move out of the bag, causing the contents of the bag to lose mass. Therefore, the correct answer is "Water moves out of the bag and the contents of the bag lose mass."

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  • 21. 

    The diagram below shows the initial diameter of a potato disc. The potato disc was placed in a hypertonic solution for one hour. Which of the diagrams below correctly shows the change in the diameter of the disc?

    • A.

      Option 1

    • B.

      Option 2

    • C.

      Option 3

    • D.

      Option 4

    Correct Answer
    A. Option 1
  • 22. 

    Red blood cells burst when they are placed in water because ....

    • A.

      The cell contents are hypotonic to the water

    • B.

      The cell contents are isotonic to the water

    • C.

      The water is hypotonic to the cell contents

    • D.

      The water is hypertonic to the cell contents

    Correct Answer
    C. The water is hypotonic to the cell contents
    Explanation
    When red blood cells are placed in water, the water is hypotonic to the cell contents. This means that the concentration of solutes inside the red blood cells is higher than the concentration of solutes in the water. As a result, water moves into the red blood cells through osmosis, causing them to swell and eventually burst.

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  • 23. 

    A piece of potato was cut and weighed. It was placed in a pure water for an hour and then removes. Dried and weighed again. Finally it was placed in a concentrated sugar solution for an hour, removed, bottled dry and weighed again. Which line records the results which would most likely be obtained?

    • A.

      First weighing 5grams / Second weighing 6grams / Third weighing 4 grams

    • B.

      First weighing 5 grams / Second weighing 4 grams / Third weighing 6 grams

    • C.

      First weighing 6grams / Second weighing 5 grams / Third weighing 4 grams

    • D.

      First weighing 5grams / Second weighing 4 grams / Third weighing 3grams

    Correct Answer
    A. First weighing 5grams / Second weighing 6grams / Third weighing 4 grams
    Explanation
    The piece of potato was initially weighed at 5 grams. After being placed in pure water for an hour, it absorbed some water and became heavier, resulting in a second weighing of 6 grams. However, when it was placed in a concentrated sugar solution for an hour, it lost some water through osmosis and became lighter, resulting in a third weighing of 4 grams. Therefore, the line that records these results is "First weighing 5 grams / Second weighing 6 grams / Third weighing 4 grams."

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  • 24. 

    The diagram below shows the appearance of a plant cell which had been placed in an isotonic solution. Which of the following diagrams best illustrates the cell after being immersed in a hypertonic solution?

    • A.

      Option 1

    • B.

      Option 2

    • C.

      Option 3

    • D.

      Option 4

    Correct Answer
    D. Option 4
  • 25. 

    The figure below is for red blood cells put in solutions having different solute concentrations. What about the concentration of each solution?

    • A.

      C isotonic / D hpotonic / A hypertonic / B can’t be

    • B.

      D can’t be / A isotonic / C hypertonic / B hypotonic

    • C.

      B super hypotonic / C isotonic / D hypotonic / A hypertonic 

    • D.

      A isotonic /B hypotonic / D super hypotonic / C hypertonic

    Correct Answer
    B. D can’t be / A isotonic / C hypertonic / B hypotonic
    Explanation
    The correct answer is D can't be / A isotonic / C hypertonic / B hypotonic. This is because isotonic solutions have the same solute concentration as red blood cells, hypertonic solutions have a higher solute concentration than red blood cells, and hypotonic solutions have a lower solute concentration than red blood cells. The figure shows that solution A is isotonic, solution C is hypertonic, and solution B is hypotonic. Solution D cannot be determined from the figure.

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  • 26. 

    The stable internal condition of a living body is called …...

    • A.

      Hypertonic

    • B.

      Hypotonic

    • C.

      Osmotic pressure  

    • D.

      Homeostasis

    Correct Answer
    D. Homeostasis
    Explanation
    Homeostasis refers to the stable internal condition of a living body. It is the ability of an organism to maintain a constant internal environment despite external changes. This process involves various regulatory mechanisms that work together to balance and adjust different physiological processes such as temperature, pH, blood pressure, and nutrient levels. Homeostasis is crucial for the proper functioning of cells and organs, ensuring optimal conditions for biological processes to occur.

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  • 27. 

    Where is the low concentration of perfume?

    • A.

      At the top of the bottle

    • B.

      At the bottom of the bottle

    • C.

      In the room

    • D.

      In the middle of the bottle

    Correct Answer
    C. In the room
    Explanation
    The low concentration of perfume is in the room because when perfume is sprayed or released into the air, it disperses and spreads throughout the surrounding space, resulting in a lower concentration compared to the concentrated perfume in the bottle. The perfume molecules mix with the air molecules and become less concentrated as they spread out. Therefore, the low concentration of perfume is found in the room.

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  • 28. 

    Four cells having different solute concentration. Water would move by osmosis from …..

    • A.

      Cell 1 to Cell 2

    • B.

      Cell 2 to Cell 3

    • C.

      Cell 3 to cell 4

    • D.

      Cell 4 to cell 1

    Correct Answer
    D. Cell 4 to cell 1
    Explanation
    Water moves by osmosis from an area of lower solute concentration to an area of higher solute concentration. In this case, Cell 4 has a higher solute concentration compared to Cell 1, so water would move from Cell 4 to Cell 1 in order to equalize the solute concentration on both sides.

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  • 29. 

    In the experiment shown below to demonstrate osmosis, the following results were obtained. Initial mass of visking tubing plus contents = 10 grams. Mass of visking tubing plus content after experiment = 8.2 grams. Therefore the result shown would be obtained when ……

    • A.

      R is 10% salt solution and S is water

    • B.

      R is 5% salt solution and S is water

    • C.

      R is 10% salt solution and S is 5% salt solution

    • D.

      R is 5% salt solution and S is 10% salt solution

    Correct Answer
    D. R is 5% salt solution and S is 10% salt solution
    Explanation
    The experiment involves osmosis, which is the movement of solvent molecules from an area of lower solute concentration to an area of higher solute concentration through a semi-permeable membrane. In this case, the initial mass of the visking tubing plus contents is greater than the mass after the experiment, indicating that water has moved out of the visking tubing. This means that the concentration of solute inside the tubing must be higher than the concentration outside. Therefore, R must be the 5% salt solution (higher concentration) and S must be the 10% salt solution (lower concentration).

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  • 30. 

    The picture below is an example of ……..

    • A.

      Osmosis

    • B.

      Permeability

    • C.

      Diffusion

    • D.

      Active transport

    Correct Answer
    C. Diffusion
    Explanation
    The picture provided does not give any indication of active transport, osmosis, or permeability. However, it does show the movement of particles from an area of high concentration to an area of low concentration, which is characteristic of diffusion. Therefore, the correct answer is diffusion.

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  • 31. 

    Some peeled (without outer covering) pieces of apple were placed in distilled water and some others in a very salty water. The cells in the apple pieces will ……

    • A.

      Lose water in both solutions.

    • B.

      Gain water in both solutions.

    • C.

      Lose water in the distilled water and gain water in the salty water.

    • D.

      Gain water in the distilled water and lose water in the salty water.

    Correct Answer
    D. Gain water in the distilled water and lose water in the salty water.
    Explanation
    When the peeled pieces of apple are placed in distilled water, the concentration of solutes inside the apple cells is higher than in the surrounding water. This creates a concentration gradient, causing water to move into the cells through osmosis, resulting in the apple cells gaining water. On the other hand, when the apple pieces are placed in salty water, the concentration of solutes in the water is higher than inside the apple cells. This creates a concentration gradient that causes water to move out of the cells through osmosis, resulting in the apple cells losing water.

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  • 32. 

    In which of the following examples below will water move from solution X to solution Y by osmosis?

    • A.

      Solution X 3% solute concentration / Solution Y 8% solute concentration.

    • B.

      Solution X 8% solute concentration / Solution Y 3% solute concentration.

    • C.

      Solution X 3% solute concentration / Solution Y 1% solute concentration.

    • D.

      Solution X 1% solute concentration / Solution Y 1% solute concentration.

    Correct Answer
    A. Solution X 3% solute concentration / Solution Y 8% solute concentration.
    Explanation
    Water moves from a region of low solute concentration to a region of high solute concentration by osmosis. In this case, the water will move from Solution X (3% solute concentration) to Solution Y (8% solute concentration) because Solution Y has a higher solute concentration.

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  • 33. 

    Three plant cells P, Q and R are found on a microscope slide. Cell P is hypotonic to cell Q and Cell R is hypertonic to cell Q. Which cell has the highest solute concentration?

    • A.

      P

    • B.

      R

    • C.

      Q

    • D.

      They all have the same solute concentration.

    Correct Answer
    B. R
    Explanation
    Cell R has the highest solute concentration. This is because it is hypertonic to cell Q, meaning that it has a higher concentration of solutes compared to cell Q. Cell P being hypotonic to cell Q indicates that it has a lower solute concentration than cell Q. Therefore, cell R has the highest solute concentration among the three cells.

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  • 34. 

    The diagram below shows the ways in which molecules may move into or out of an animal cell. Which of the molecules could represent the movement of carbon dioxide? And which could represent the movement of oxygen?

    • A.

      A oxygen / C carbon dioxide

    • B.

      B oxygen / C carbon dioxide

    • C.

      D oxygen / A carbon dioxide

    • D.

      A oxygen / B carbon dioxide

    Correct Answer
    D. A oxygen / B carbon dioxide
    Explanation
    The correct answer is A oxygen / B carbon dioxide. Oxygen is a small molecule that can easily diffuse across the cell membrane, so it can move into or out of an animal cell through simple diffusion. Carbon dioxide, on the other hand, is also a small molecule that can diffuse across the cell membrane, but it can also be transported out of the cell through active transport. Therefore, oxygen can move through simple diffusion while carbon dioxide can move through both diffusion and active transport.

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  • 35. 

    Movement of ions against concentration gradient is said to exist when …...

    • A.

      Concentration of ions is more inside the cell and less outside the cell

    • B.

      Concentration of ions is lesser inside the cell and more outside the cell

    • C.

      Hypotonic solution enters the cell

    • D.

      Water enters by osmosis

    Correct Answer
    A. Concentration of ions is more inside the cell and less outside the cell
    Explanation
    When the concentration of ions is higher inside the cell and lower outside the cell, it indicates that there is movement of ions against the concentration gradient. This means that the ions are moving from an area of higher concentration (inside the cell) to an area of lower concentration (outside the cell). This movement requires energy and is often facilitated by ion pumps or channels in the cell membrane.

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  • 36. 

    What is the difference between active and passive transport?

    • A.

      Active does not need energy and passive uses ATP (energy)

    • B.

      Active uses ATP (energy) and passive does not need energy

    • C.

      Active stores transport proteins and passive releases

    • D.

      Active uses hormones and passive does not

    Correct Answer
    B. Active uses ATP (energy) and passive does not need energy
    Explanation
    Active transport requires the use of ATP (energy) to move molecules across the cell membrane against their concentration gradient. This process is carried out by specific transport proteins. On the other hand, passive transport does not require energy and occurs spontaneously, moving molecules along their concentration gradient. This can happen through processes like diffusion, osmosis, and facilitated diffusion. Therefore, the correct answer is "Active uses ATP (energy) and passive does not need energy."

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  • 37. 

    If the blue colour in the figure below represents the concentration of Cl - ions inside cells of Nitella algae and the yellow colour represents its concentration in the swamp. So Cl ions enter inside the algae by means of …..

    • A.

      Active transport

    • B.

      Diffusion

    • C.

      Osmosis

    • D.

      Passive transport

    Correct Answer
    A. Active transport
    Explanation
    Active transport is the process by which ions or molecules are moved across a cell membrane against their concentration gradient, requiring the use of energy. In this case, the blue color representing the concentration of Cl- ions inside the cells of Nitella algae suggests that the concentration of Cl- ions is higher inside the cells compared to the swamp represented by the yellow color. Active transport is the only process that can move ions against their concentration gradient, allowing Cl- ions to enter inside the algae cells. Diffusion, osmosis, and passive transport do not require energy and cannot move ions against their concentration gradient.

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  • 38. 

    The diagram shows the movement of molecules across a cell membrane. Which conclusion can be drawn from the diagram?

    • A.

      Only water molecules move into the cell by osmosis

    • B.

      Only glucose molecules move into the cell by active transport

    • C.

      Both water and glucose molecules move into the cell by diffusion

    • D.

      Both water and glucose molecules move into the cell by active transport

    Correct Answer
    A. Only water molecules move into the cell by osmosis
    Explanation
    The diagram shows that only water molecules are moving across the cell membrane, indicating that osmosis is the process by which they are entering the cell. Osmosis is the movement of water molecules from an area of lower solute concentration to an area of higher solute concentration through a selectively permeable membrane. Since the diagram does not show any movement of glucose molecules, it can be concluded that only water molecules move into the cell by osmosis.

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  • 39. 

    The Orobanche is a/an …….. organism.

    • A.

      Parasitic

    • B.

      Saprophytic

    • C.

      Insectivorous

    • D.

      Photosynthetic

    Correct Answer
    A. Parasitic
    Explanation
    The correct answer is "Parasitic" because Orobanche is a type of plant that is known for being parasitic. It lacks chlorophyll and cannot produce its own food through photosynthesis, so it relies on other plants for nutrients by attaching itself to their roots and extracting resources from them. This parasitic lifestyle allows Orobanche to survive and thrive in various environments.

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  • 40. 

    All of the following are among the adaptations of root hairs to their function except ……

    • A.

      Root hairs secrete a viscous substance To help these hair to find their way easily among the soil particles.

    • B.

      Root hairs have thin cell walls to permit the passage of water and salts.

    • C.

      The osmotic pressure of the root hair is less than that of the soil inorder to absorb water by osmosis.

    • D.

      They are large in number to increase the area of absorption.

    Correct Answer
    C. The osmotic pressure of the root hair is less than that of the soil inorder to absorb water by osmosis.
    Explanation
    Root hairs have a higher osmotic pressure than the soil in order to absorb water by osmosis. This is because the higher osmotic pressure in the root hairs allows them to draw water from the soil. The other adaptations mentioned in the options, such as the secretion of a viscous substance, thin cell walls, and large numbers of root hairs, are all true and contribute to the function of root hairs in absorption of water and nutrients from the soil.

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  • 41. 

    Which of the following substances can absorb mineral ions independently of water ….

    • A.

      Suberin

    • B.

      Cellulose

    • C.

      Lignin

    • D.

      None of them

    Correct Answer
    D. None of them
    Explanation
    Suberin, cellulose, and lignin are all substances found in plant cell walls. However, none of them have the ability to absorb mineral ions independently of water. Plant roots have specialized structures called root hairs that are responsible for absorbing water and mineral ions from the soil. These substances in the cell walls of plants provide support and structure, but they do not have the ability to absorb mineral ions on their own. Therefore, the correct answer is None of them.

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  • 42. 

    Which one of the following is not a micronutrient?

    • A.

      Magnesium

    • B.

      Molybdenum

    • C.

      Boron

    • D.

      Zinc

    Correct Answer
    A. Magnesium
    Explanation
    Magnesium is not a micronutrient because it is required by plants in relatively large amounts compared to other micronutrients. Micronutrients are essential elements that are required by plants in very small quantities, typically in the range of parts per million. Magnesium, on the other hand, is required in larger quantities and is considered a macronutrient. It plays a crucial role in various plant functions, including photosynthesis, enzyme activation, and nutrient transport.

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  • 43. 

    Which of the following minerals help to activate enzymes?

    • A.

      Nitrogen and phosphorus

    • B.

      Magnesium and manganese

    • C.

      Potassium and molybdenum

    • D.

      Aluminium and copper

    Correct Answer
    D. Aluminium and copper
    Explanation
    Aluminium and copper are minerals that help to activate enzymes. Enzymes are proteins that act as catalysts in biochemical reactions, and they require certain minerals to function properly. Aluminium and copper are two such minerals that play a crucial role in enzyme activation. Aluminium is involved in the activation of enzymes like phosphatases and catalases, while copper is necessary for the activation of enzymes such as cytochrome oxidase and superoxide dismutase. These minerals assist in the proper functioning of enzymes, allowing them to carry out their specific biochemical reactions effectively.

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  • 44. 

    During rainy season, wooden doors are difficult to open or closure because of …..

    • A.

      Imbibition

    • B.

      Osmosis

    • C.

      Difusion

    • D.

      Selective permeability

    Correct Answer
    A. Imbibition
    Explanation
    During the rainy season, wooden doors are difficult to open or close because of imbibition. Imbibition is the process by which water is absorbed by a solid material, such as wood. When wood absorbs water, it swells and becomes larger in size, causing the doors to become difficult to open or close. This is because the absorbed water causes the wood to expand, making it harder to move the doors within their frames.

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  • 45. 

    Imbibition is the absorption of water/liquid by a solid substance …….. forming solution.

    • A.

      With

    • B.

      Without

    • C.

      Both of them

    • D.

      None of them

    Correct Answer
    B. Without
    Explanation
    Imbibition is the process of absorption of water or liquid by a solid substance. It does not involve the formation of a solution. In imbibition, the liquid is absorbed by the solid substance without any chemical reaction or dissolution of the solute. Therefore, the correct answer is "Without".

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  • 46. 

    A cell increases in volume when it is placed in …..

    • A.

      Hypertonic solution

    • B.

      Hypotonic solution

    • C.

      Isotonic solution

    • D.

      A solution that has the same salt concentration

    Correct Answer
    B. Hypotonic solution
    Explanation
    When a cell is placed in a hypotonic solution, it means that the concentration of solutes outside the cell is lower than inside the cell. As a result, water molecules move into the cell through osmosis, causing the cell to swell and increase in volume.

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  • 47. 

    The part of root involved in water absorption is ……

    • A.

      Zone of cell division

    • B.

      Zone of root hairs

    • C.

      Zone of elongation

    • D.

      Zone of root cap

    Correct Answer
    B. Zone of root hairs
    Explanation
    The zone of root hairs is responsible for water absorption in plants. Root hairs are tiny, finger-like projections that increase the surface area of the root, allowing for more efficient absorption of water and nutrients from the soil. These root hairs have a high concentration of water-permeable cell membranes, which facilitate the movement of water into the root. Therefore, the zone of root hairs is the part of the root that is directly involved in water absorption.

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  • 48. 

    If the concentration of K+ ions in the swamp is 1.2 x 103 ion/ liter. So the concentration of K+ ions in the cell sap of Nitella alga is ……. ion/liter.

    • A.

      1.2 x 103

    • B.

      0.8 x 103

    • C.

      2.4 x 103

    • D.

      0.15 x 103

    Correct Answer
    C. 2.4 x 103
  • 49. 

    The ability of plant cells to imbibe water is due to ……

    • A.

      Their colloidal nature

    • B.

      Their flexibility

    • C.

      Their selective permeability

    • D.

      All the previous

    Correct Answer
    A. Their colloidal nature
    Explanation
    The ability of plant cells to imbibe water is due to their colloidal nature. Colloidal substances have the property of imbibing water, which allows plant cells to absorb and retain water. This is important for various cellular processes, including maintaining turgidity and facilitating nutrient uptake. The colloidal nature of plant cells enables them to swell and expand as they absorb water, providing structural support to the plant.

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  • 50. 

    The graph below illustrates the phenomenon of …..

    • A.

      Osmosis

    • B.

      Active transport

    • C.

      Imbibition

    • D.

      Diffusion

    Correct Answer
    D. Diffusion
    Explanation
    The graph below illustrates the phenomenon of diffusion. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. In the graph, the molecules are spreading out evenly over time, indicating the movement from an area of higher concentration to lower concentration. This process is characteristic of diffusion.

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