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Transport in Plants Test - 46

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Transport in Plants Test - 46
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  • Question 1
    1 / -0
    The living cells of phloem is
    Solution
    D. Both B and C
    Reason: In plants, xylem and phloem are found as vascular tissues. Phloem is responsible for transportation of food materials. It consists of four type of components i.e. Sieve tube, companion cell, phloem parenchyma and phloem fiber.
    Phloem parenchyma contains a defined nucleus and dense cytoplasm.
    Sieve tube has a large vacuole and peripheral cytoplasm but lacks nucleus.
    Companion cells are living parenchymal components of phloem.
    Phloem fibres at the only dead component of phloem with thick walls.
  • Question 2
    1 / -0
    Phloem parenchyma acts like
    Solution
    The parenchyma cells in the phloem tissue are known as phloem parenchyma. There are different types of phloem parenchyma cells, companion cells, albuminous and other parenchyma cells. The transfer cells are a type of companion cells. These are the cells which have folded cell wall surface which help in scavenging the solutes which require ATP to move across the membranes. 
    The parenchyma cells act as packaging material. These cells fill the gaps between the other cells in the phloem. 
    The sieve cells are the conducting cells in the phloem. These are the cells which help in the transport of sugar. 
    Thus, the correct answer is option D. 
  • Question 3
    1 / -0
    The movement of solvent molecules into the region of higher solute concentration through a semipermeable membrane is called
    Solution
    Osmosis is defined as movement of solvent or water from a region of its higher concentration to a region of its lower concentration through a semi permeable membrane that tends to equalize the solute concentrations on the two sides. The energy which drives this process is called as osmotic pressure and is important for living organisms because it allows water and nutrients dissolved in water to pass through cell membranes.
    Thus, the correct answer is option C.
  • Question 4
    1 / -0
    The value of osmotic potential of an electrolyte is always
    Solution
    • Osmotic potential refers to the effect of dissolved solutes on the water potential.
    • Since electrolytes dissociate into their component ions; the increased number of dissolved particles as compared to the non-electrolytes imparts more reduction in the water potential of a solution with reference to the state of pure water. 
    • So, the osmotic potential of the electrolyte is more than that of non-electrolytes.
      Hence, the correct option is A.
  • Question 5
    1 / -0
    This experiment is conducted to prove 

    Solution
    The experiment was performed to measure the root pressure. The plant stem is cut and the manometer is attached to it. There is a graduated tube filled with mercury. The level of the mercury rises with the absorption of water by the roots. This level of mercury can be used to predict the pressure on the root. 
    Thus, the correct answer is option A.  
  • Question 6
    1 / -0
    If transpiration doesn't take place in plants, which process will  also not occur?
    Solution
    Transpiration is the process in which there is loss of water from the plants in the form of water vapour. Since, there is loss of water there is a pressure of suction force created in the upward direction. This allows the cells of the root hair to absorb more water. When the water is absorbed, the suction force causes the water to move in the upward direction from the roots to the leaves. 
    Thus, the correct answer is option C. 
  • Question 7
    1 / -0
    Osmosis is a type of
    Solution
    Osmosis is the movement of water through a semipermeable membrane down the concentration gradient. So, it is a type of diffusion of solvent, not of solute. Imbibition is the absorption of water by a seed or any dry surface. Evaporation refers to the transition of water into the vapor phase. 
    So, the correct answer is option B.
  • Question 8
    1 / -0
    The first process which occurs when the seed is placed in the soil is ______.
    Solution

    During the beginning stage of the germination, the seeds take up water rapidly and this results in swelling and softening of the seed coat at an optimum temperature. By rupturing of the seed coats helps to emerge the radicle and the plumule to form a primary root. This stage is referred to as an imbibition. So, the correct answer is ‘Imbibition’.

  • Question 9
    1 / -0
    Root pressure is measured by
    Solution
    Root pressure is the pressure in roots caused by the osmosis between roots and soil. It is also called as osmotic pressure. The manometer is a device used for measuring root pressure. Whereas potometer is used to measure the rate of transpiration, a barometer is used to measure atmospheric pressure and auxanometer measures the rate of growth of plants
    So, the correct answer is 'Manometer'
  • Question 10
    1 / -0
    The process of absorption of water into raisins occurs through its membranes. This process is known as
    Solution
    Osmosis is the flow of solvent from their higher concentration region to their lower concentration region through a semipermeable membrane. The raisin membrane is semipermeable hence it absorbs water. This process continues till the cells become turgid. Thus the correct answer is option B.
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