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Transport in Plants Test - 51

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Transport in Plants Test - 51
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  • Question 1
    1 / -0
    Assume that an actively respiring cell has $$3X$$ number of $$K^+$$ in its cytoplasm and $$2X$$ number of $$K^+$$ outside. After some time X number of $$K^+$$ entered the cell. What is the process by which $$K^+$$ transport has taken place?
  • Question 2
    1 / -0
    In seed germination the first step that occurs is :
    Solution
    Water plays an important in germination. It enters inside the seed by the process of imbibition. Water allows the seed to swell which breaks the seed coat and the seed germinate. The process of adsorption of water by solid particles of a substance without forming a solution is called imbibition. Water molecules are at constant random motion because of its less viscosity so it has greater kinetic energy. Due to its kinetic energy, water is adsorbed by the surface from higher concentration to lower concentration. The kinetic energy is released as heat.
    So, the correct answer is option C.
  • Question 3
    1 / -0
    Cotton fibres dipped in water absorb water through
    Solution
    (A) Endosmosis is the movement of solution from outside the cell to the inside of the cell.
    (B) Exosmosis the movement of solution from inside of the cell to the outside of the cell. Cotton fibers do not contain any solution so there is no diffusion as a result of which there is no condition of exosmosis and endosmosis.
    (C) Capillarity is the property of a liquid in a capillary to rise and fall due to surface tension. Cotton fibers are like fine threads and they are able to absorb water and water raises by capillary action when they are dipped in water. 
    (D) Imbibition is the diffusion of the solution by solids. Cotton fibers are not perfect solids so there is no imbibition.
    So, the correct option is 'Capillarity'.
  • Question 4
    1 / -0
    In osmosis, the volume of solvent (in solution) will 
    Solution
    Osmosis is the process of movement of molecules from the region of higher concentration to the lower concentration. The cells absorb water by the process of osmosis from its surrounding and the volume of solvent increases. On absorption of water the turgor pressure inside the cells increases as the number of solvent molecules increases inside the cells.
    So, the correct answer is option B.
  • Question 5
    1 / -0
    Plasmolysis is due to :
    Solution
    • Plasmolysis occurs when plant cells lose water after being placed in a solution that has a higher concentration of solutes than the cell. 
    • Hence, water flows out from the cells and into the surrounding fluid. As the movement of water is from the cell to the outside, this process is exosmosis.

    Thus, the correct answer is option A.
  • Question 6
    1 / -0
    The loss of which will harm the tree most
    Solution
    (A) The loss of bark called girdling will eventually lead to the death of the plant.
    (B) Loss of half of the leaves will affect the rate of transpiration and the production of starch.
    (C) Loss of half of the branches would not affect plant much.
    (D) Loss of all of the leaves will either make the new leaf growth or if the plant is weak it will die.
    So, the correct answer is 'Bark'.
  • Question 7
    1 / -0
    The movement of water from one cell of cortex to the next in the root is due to 
    Solution
    (A) Water potential is the relative tendency of water to move from one area to another.
    (B) The chemical potential gradient is the energy gradient, form of energy absorbed or released during the chemical reaction.
    (C) Accumulation of inorganic salts in the cell does not affect the water movement in roots.
    (D) Accumulation of organic salts in the cell does not affect the water movement in roots.
    So, the correct answer is 'Water potential gradient'.
  • Question 8
    1 / -0
    Root pressure is due to  
    Solution
    (A)Active absorption is the absorption of water by roots with the help of ATP.
    Root pressure is due to active absorption and active distribution of mineral nutrients. It is measured by potometer.
    (B)Passive adsorption is the energy independent process.
    (C)Transpiration is the evaporation of water from the upper surface of the leaves.
    (D)Photosynthesis is the process of making of glucose.
    So, the correct answer is (A) 'Active absorption/ transportation'.
  • Question 9
    1 / -0
    Plant cooling occurs due to 
    Solution
    Transpiration is the evaporation of the water from the stomata of the plants. The water absorbed by the roots is transported up to the leaves where stomata are present. Stomata open during the daytime and increasing temperature results in loss of water in the form of vapours. This is similar to the sweating process that occurs in humans. It cools the plants during high temperature.
    Assimilation is the use of minerals by plants.
    Guttation is oozing out of water in liquid form during night-time.
    Photorespiration is a deviation in photosynthesis when the concentration of oxygen increases.
    Transpiration is evaporation of water due to increased temperature during daytime.
    So, the correct answer is 'Transpiration'.
  • Question 10
    1 / -0
    Which one dies first when a ring of bark is removed?
    Solution
    The total removal of bark is called girdling, so when the bark is removed the roots will die first as they will starve without the sugar production by the leaves transported down.
    So, the correct answer is 'Root'.
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