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Transport in Plants Test - 61

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Transport in Plants Test - 61
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  • Question 1
    1 / -0
    When a plant undergoes senescence, the nutrients may be:
    Solution
    When a plant undergoes senescence, mineral ions are frequently mobilized from older parts to apical and lateral meristems, young leaves, developing fruits and seeds by diffusion and by active uptake by cells in the growing regions. This is known as translocation of nutrients.
    So, the correct answer is option C.
  • Question 2
    1 / -0
    Incipient plasmolysis is
    Solution

    Shrinkage of protoplast due to the occurrence of exosmosis in a cell is called Plasmolysis. In this process, in the initial stages, the plasma membrane is separated from the cell wall at the corners, this stage is called Incipient plasmolysis.

    So, the correct option is ‘Initial stage of plasmolysis’.
  • Question 3
    1 / -0
    The loss of water in the form of water vapour through stomata on leaves is known as 
    Solution
    a) Distillation is the process by which a mixture of liquids is separated into its components.
    b) Diffusion is the passive movement of molecules along their concentration gradient.
    c) Osmosis is the movement of water molecules from less concentrated solution to a more concentrated solution through a semipermeable membrane.
    d) Transpiration is the evaporation of water from the leaves through minute pores called stomata.
    So, the correct answer is D.
  • Question 4
    1 / -0
    Two semi-permeable bags containing 2% sucrose placed in two beakers, 'P' containing water and 'Q' containing 10% sucrose. Which one of the following outcomes is true?
    Solution
    Osmosis is the net movement of solvent molecules into a region of higher solute concentration through a semi-permeable membrane. In the given question, one of the 2% sucrose containing bags (semi-permeable) is placed in a water-containing beaker. Clearly, the concentration in the bag is more than the beaker and as a result, water will move through the semi-permeable membrane (endosmosis) and make the bag turgid. On the other hand, the second beaker contains 10% sucrose solution which is more concentrated than the semi-permeable bag's sucrose concentration. Hence water will move out of the bag to the beaker and make the bag flaccid (exosmosis). Thus, the answer B is correct.
  • Question 5
    1 / -0
    Glucose, gatactose and fructose all have the same molecular size and composition and their absorption through the mucosal cells takes place
    Solution
    Glucose and galactose when being absorbed are absorbed at a rapid rate and fructose because these are absorbed by active absorption. Here the ATP is used for the absorption of glucose and galactose. Fructose is absorbed passively by simple diffusion, therefore, it is a slower process.
    So, the correct option is 'glucose is absorbed most rapidly'

  • Question 6
    1 / -0
    During rainy season wooden doors and windows are not properly closed. Why?
    Solution
    During rainy season wooden doors and windows are not properly closed due to the phenomenon called as imbibition. During rainy season, there is high amount of moisture in the air. This moisture is absorbed by the cells of wooden doors and windows and they swell up.
    Thus, the correct answer is option D.
  • Question 7
    1 / -0
    Ringing/girdling experiments demonstrate
    Solution
    Ringing/Girdling experiments demonstrate that phloem is responsible for translocation of food because phloem is present outside to xylem so when a ring of bark is removed from a woody plant, the woody xylem part remains intact, water and nutrient reaches the leaves. After the preparation of the photosynthate, it is not transported to other parts below the girdle since the phloem part is removed. This experiment shows that the phloem tissue aids food transport.
    So, the correct option is A.
  • Question 8
    1 / -0
    Choose the correct answer from the alternatives given.
    If a cell is placed in an isotonic solution, what will occur?
    Solution
    Two or more isotonic solutions are those that have the same osmotic pressure across a semipermeable membrane. When a cell is placed in an isotonic solution, there will be no or equal exchange of salts between them; hence, then cells will neither shrink nor burst and there will be no movement of salts between the cells and the surrounding solution.

    So, the correct answer is 'None of the above will occur'.
  • Question 9
    1 / -0
    What indicate $$X, Y$$ in the given diagram?

    Solution
    The given diagram represents the symplastic pathway of water movement. In symplast pathway, water travels from one cell to next through plasmodesmata. The symplast consists of an entire network of cell cytoplasm which is interconnected by plasmodesmata. Hence, in the diagram, X is the cell surface membrane and Y is plasmodesmata or plasmodesma.
    So, the correct answer is A.

  • Question 10
    1 / -0
    Choose the correct answer from the alternatives given.
    Active transport from outside to inside of molecules across a membrane requires:
    Solution
    Active transport, which is the movement of ions or molecules across a cell membrane in the direction opposite that of diffusion, that is, from an area of lower concentration to one of higher concentration, requires the assistance of a type of protein called a carrier protein, using energy supplied by ATP. So, the correct option is 'ATP'.
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