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Transport in Plants Test - 26

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Transport in Plants Test - 26
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Professor K.C. Mehta is known for his contribution in the field of
    Solution
    Professor K.C. Mehta is one of the eminent scientists of India. He is known for his contribution in the field of plant pathology. Plant pathology is a branch of science which deals with the study of diseases in plants which are caused by pathogens. Research of Professor K.C. Mehta related to recurrence of rust in the plains of India is most famous. He even worked on black rust of cereals in Cambridge University. From his researches, it has been concluded that Black rust in plains of India spreads from the Himalayas in the North and Nilgiri and Puleny hills in the South.
  • Question 2
    1 / -0
    Which of the following statement is correct?
    Solution
    Osmosis is the process of the movement of solvent molecules through a semipermeable membrane. In this process, the water molecule moves from a region of higher solvent concentration to the region of lower solvent concentration. The energy which drives this process is called osmotic pressure. Osmosis is of great importance in biological processes in plants and animals both. Thus, the correct answer is option D.
  • Question 3
    1 / -0
    Diffusion of water into endodermis takes place through ?
    Solution
    Cells of endodermis are covered with Casparian strips and do not allow free movement of water across the endodermal layer. However, in some plants endodermal layer is punctured by the presence of thin-walled passage cells through which water can pass easily. The passage cells are positioned against protoxylem so that water can easily enter the vascular bundles for transportation along the transpiration stream.
    So, the correct answer is option B.
  • Question 4
    1 / -0
    Imbibition is a
    Solution

    Solution

    Correct answer is option B.
    Explanation for correct option:

    • Imbibition is the physical adsorption of water molecules on the adsorbing surface. Seed absorb water due to imbibition.
    • The imbibition of water is the first step in seed germination.
    • Imbibant holds water through the processes of capillarity and adsorption.

  • Question 5
    1 / -0
    Which of the following is correct?
    Solution
    DPD stands for diffusion pressure deficit. Its value is calculated by the formula DPD = OP - TP, where OP stands for osmotic pressure and TP stands for turgor pressure. Water always flows from an area of lesser DPD towards an area having higher DPD. The TP is equal and opposite in direction to Wall Pressure or WP, as per Newton's law. On substituting WP in place of TP and transposing WP and DPD, the equation becomes WP = OP - DPD.
  • Question 6
    1 / -0
    The osmotic pressure of the cell sap is more in
    Solution
    Higher osmotic pressure in cell sap is a physiological adaptation, which helps xerophytes to absorb water. Xerophytes grow in an area water deficit. The water deficit can be physical example cold and hot deserts or physiological example areas with higher salinity and marshy areas.
  • Question 7
    1 / -0
    Rubber does not swell in water due to absence of
    Solution
    Imbibition is physical adsorption of water molecules onto the adsorbing surface. Seed absorb water due to imbibition. The imbibition of water is the first step in seed germination. Imbibant holds water through the processes of capillarity and adsorption. The dry adsorbent has a highly negative water potential. As it comes in contact with water, a steep water potential gradient is created. Water rapidly diffuses into adsorbent till an equilibrium is established. The amount of imbibition is influenced by the texture of imbibant, affinity of imbibant, temperature, pressure, electrolytes and pH. For example, the rubber will not imbibe water but will readily imbibe ether.
    Thus, the correct answer is option C.
  • Question 8
    1 / -0
    The equal and opposite pressure to turgor pressure is
    Solution
    OP stands for osmotic pressure and TP stands for turgor pressure. The TP is equal and opposite in direction to Wall Pressure or WP, as per Newton's law. Turgor pressure is the pressure exerted by cell cytoplasm on the cell wall and Wall pressure is the pressure exerted by Cell wall on cell cytoplasm. Wall will exert pressure on cytoplasm only if cytoplasm exerts pressure on wall. Further wall will exert only that much pressure as the cytoplasm will exert on wall.
  • Question 9
    1 / -0
    Osmotic potential of a solution is always
    Solution
    In a solution solute particles displace solvent molecules as compared to pure solvent. The number of solute particles directly determine the magnitude of osmotic potential. The sign of osmotic potential is negative. More negative osmotic potential means that more solute particles are present in the system and greater will be the tendency of water molecules to rush into such a system
  • Question 10
    1 / -0
    When epidermal peeling of Tradescantia is placed in a strong sugar solution and the cell content contract away from the cell wall. This phenomenon is called as
    Solution
    Plasmolysis occurs when water moves out of the cell due to the process of exosmosis and cell cytoplasm shrivels and leaves the cell wall. It occurs when a cell is placed in a hypertonic solution, whereas deplasmolysis occurs when a cell is placed in a hypotonic solution.
    So, the correct answer is option B.
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