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Transport in Plants Test - 17

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Transport in Plants Test - 17
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The process of osmosis involves
    Solution
    Osmosis involves movement of solvent through a semipermeable membrane along the concentration gradient.
  • Question 2
    1 / -0
    Plant cell gets plasmolysed in a solution which is
    Solution
    When a cell is placed in hypertonic solution then exosmosis occurs. Due to exosmosis the protoplasm shrinks and leaves the cell wall and thus cell becomes flaccid. The cell shrinks because the water flows from lower concentration of solute, that is from inside the cell  to the higher concentration of solute, that is outside the cell, and the protoplasm shrinks towards a corner of the cell, called plasmolysis.
    So, the correct answer is option B.
  • Question 3
    1 / -0
    Which of the following is not a function of water in cell?
    Solution
    Water is universal solvent and acts as medium for chemical reactions. It can release hydrogen ions on ionisation but does not provides energy. ATP provides energy in living system. ATP is universal energy currency. In fact energy is required to break water, because otherwise water is a very stable molecule and has the capacity to form hydrogen bonds.
  • Question 4
    1 / -0
    When plant cells are kept in a concentrated salt solution, they are
    Solution
    • When plant cells are kept in a concentrated salt solution, water will flow out from plant cells due to the process of exosmosis, and thus, cells shrink, called plasmolysis, and cells are called plasmolyzed cells. 
    • This is because water always flows from a region of high to low water potential. 
    • In this case, water inside the plant cell has more potential as compared to the water present outside in concentrated salt solution. 
    • Thus, the correct answer is option B.
  • Question 5
    1 / -0
    In seed germination, the first phenomenon to take place is
    Solution
    Imbibition is the first phenomenon in seed germination. Imbibition is a passive physical process and is actually adsorption of water by the dry surface. It causes swelling of dry seeds. Water is the medium for all the metabolic reactions in the living system. Hence, the most important requirement of seed germination is water. Dry seeds adsorb water which marks the beginning of seed germination.
    So, the correct answer is 'Imbibition'
  • Question 6
    1 / -0
    What shall be the sequence of events during wilting of a plant?
    Solution
    Exosmosis is a movement of water from the cell to outside. This leads to plasmolysis. Plasmolysis is the phenomenon in which protoplasm of the cell of the leaves moves away from the cell wall and starts to shrink. The plasmolysis leads to drooping of leaves, which is known as wilting.
  • Question 7
    1 / -0
    When a potato piece is kept in a highly concentrated salt solution, then
    Solution
    In a highly concentrated salt solution, water is present at a low concentration as compared to the concentration inside the potato cells. This leads to loss of water from cells of potato and potato is plasmolysed.
  • Question 8
    1 / -0
    Which of the following has more imbibition power?
    Solution
    Imbibition is a physical process in which water is adsorbed on the surface. Proteins show higher imbibition capacity than cellulose and fats. Thus, pea seed gets swelled more due to imbibition. 
  • Question 9
    1 / -0
    Which of the following experiment is called physiological demonstration of osmosis?
    Solution
    • Osmosis can be defined as the movement of solvent from a dilute solution (high concentration of solvent) to a concentrated solution (lower concentration of solvent)
    • In Thistle funnel experiment, an egg's membrane/parchment paper is tied tightly around the  mouth of the funnel with thread or rubber band. 
    • Now dilute sugar solution is carefully poured into the stem of the funnel to a certain level. 
    • The wide mouth of the funnel containing sugar solution is now kept in a beaker with the help of an Iron stand. 
    • Now 75% of the beaker is filled with water. A similar control setup also arranged but by taking plain water in the beaker and also plain water in Thistle Funnel. 
    • The apparatus is left undisturbed for 10 minutes. We find the level of sugar solution increases from its initial level in the experimental setup while there is no change in the level of water in the stem of Thistle Funnel in the control setup. 
    • This observation clearly indicates the movement of water molecules occurred from the beaker into Thistle Funnel in the case of experimental setup while in the control setup there is no movement of water molecules from beaker into Thistle Funnel through egg's membrane/parchment paper because both the solutions are of same concentration.

    So, the correct answer is 'Both A and B'.
  • Question 10
    1 / -0
    Movement of particles of matter in the cell due to its own kinetic energy is called
    Solution
    • Kinetic energy is the energy present in the solute or solvent when the molecules are in a state of constant or random motion. The process of adsorption of water by a solid 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 absorbed by the surface from higher concentration to lower concentration. The kinetic energy is released as heat.

    So, the correct answer is option A.
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