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Transport in Plants Test - 53

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Transport in Plants Test - 53
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  • Question 1
    1 / -0
    Water absorbed by root to meet the requirement of transpiration is possible due to 
    Solution
    (A)Diffusion is the movement of water from the higher concentration to lower concentration.
    (B)Osmosis is the movement of water from low solute concentration to high concentration through a semi-permeable membrane.
    Water concentration in soil is low than water potential of root so water is absorbed by root from the soil.
    (C)Imbibition is the diffusion when water is absorbed by solid colloid.
    (D)Plasmolysis is the contraction of protoplast due to the loss of water.
    So, the answer is 'Osmosis'. 
  • Question 2
    1 / -0
    Dry wooden stakes driven in cracks of a rock and soaked will develop pressure that will split the rock. The phenomenon is 
    Solution
    (A) Osmotic pressure is the pressure applied to the pure solvent to prevent it from passing a solution.
    (B) Imbibition is the flow of water from the outer environment to solids like wooden things. Eg. Water flows into wooden doors and rocks.
    Due to imbibition only dry wooden stakes driven in cracks of rock and soaked will develop pressure that will split the rock.
    (C) Turgor pressure is the pressure applied by the osmotic flow of water on the walls of the cell.
    (D) Deplasmolysis is the entrance of water into a plasmolysed cell.
    So, the correct answer is 'Imbibition'.
  • Question 3
    1 / -0
    Osmotic potential is depicted as 
    Solution

    Correct answer: option (A)
    Explanation for the correct option:

    • Osmotic potential is the potential of water to move from the region of its higher concentration to the region of its lower concentration. Its value is zero for pure water and becomes negative on the addition of solute.
    • As water always exists in the form of a solution with solutes added to it. the value of osmotic potential is always negative.

  • Question 4
    1 / -0
    Given below are assertion and reason. Point out if both are true with the reason being a correct explanation (A), both true but the reason is not a correct explanation (B), the assertion is true but the reason is wrong (C) and both are wrong (D).
    Assertion : A plant girdled up to bark shows signs of degeneration of the lower portion.
    Reason : Water transportation will cease.
    Solution
    Girdling is the removal of the bark totally from the tree which ceases the metabolism of the plant and slowly leads to plant death. The plant dies starving due to the cease in solute transportation.
    So, the correct answer is 'C'.
  • Question 5
    1 / -0
    Loading of phloem means
    Solution
    Loading of phloem is a process of loading carbon into the phloem for transport to different sinks in a plant. Sinks include metabolism, growth, storage and other processes or organ that need carbon solutes to persist.
    So, the correct answer is 'Pouring of sugar into phloem'.
  • Question 6
    1 / -0
    Water lost through transpiration is 
    Solution
    Transpiration is the process of the evaporation of water molecule from the upper surface of the leaves.
    The water eluted out is the water without any solute concentration, so the water is pure.
    So, the correct answer is 'Pure water'.
  • Question 7
    1 / -0
    In pickles, infection is rare due to 
    Solution
    In pickles, infection is rare due to the high concentration of the salt which inhibits the growth of the microorganism and even kill the growing microbes. The microbes are unable to grow because high salt concentration leads to exosomosis. The cells of microbes losses water as there is a lesser concentration of solvent molecules than the fluid inside the cell so the solvent molecules are forced outside the cell from the region of higher concentration to the lower concentration. The cell turns flaccid. On the further loss of water, the protoplasm shrinks and moves away from the cell wall and the cell gets dehydrated and finally, the microbes die.
    So, the correct answer is option A.
  • Question 8
    1 / -0
    In the experiment to demonstrate root pressure, where did the cut was made on the plant? 
    Solution
    Root pressure is the transverse osmotic pressure within the cell of root that causes the rise of sap through the stem of the plant. So, to demonstrate root pressure the cut made is on the shoot just a few centimetres above from the ground.
    So, the correct answer is 'A few centimetres above the soil'.
  • Question 9
    1 / -0
    Exchange of substances between a cell and its environment is mediated through
    Solution
    Exchange of substances between a cell and its environment is mediated through osmosis, active transport and diffusion.
    Osmosis is the process of diffusion of molecules from the region of higher concentration to the lower concentration through a semipermeable membrane. The cells absorb water by the process of endosmosis from its surrounding and water exits by the process of exosmosis. 
    Active transport is the transport which requires energy and helps to transfer molecules from region of low concentration to high concentration. Water and minerals ions are inorganic material present in the soil. They exist mainly in ionic form because the root hair absorbs the mineral by passive absorption to outer space like intercellular space and cell wall but for absorption into the inner space like cytoplasm and the vacuoles, it needs active transport which required ions to create a concentration gradient. 
    Diffusion is random movement of molecules from the region of higher concentration to the lower concentration. It allows the gaseous exchange during transpiration from the stomata. 
    So, the correct answer is option D.
  • Question 10
    1 / -0
    Munch hypothesis is based on translocation of food due to
    Solution
    Munch hypothesis is also called the pressure flow hypothesis, it explains the movement of sap through the phloem. It proposed by Ernest Munch in 1930. High concentration of organic substance inside the cell of the cells of the phloem at a source that creates the diffusion gradient drawing water from the adjacent xylem resulting into the turgor pressure.
    So, the correct answer is 'Turgor pressure gradient'.
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