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Transport in Plants Test - 22

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Transport in Plants Test - 22
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  • Question 1
    1 / -0
    The chief role of transpiration in plants is to cause
    Solution

    Transpiration is the process by which plants throw out the extra water present in it. Since water is an essential ingredient in the survival of the plants, it is absorbed through the roots. However, only a small amount of water is taken up for the metabolic activity. The rest 90-95% water is thrown out through the process of transpiration. The stomata along with the guard cells present in the underside of the leaves help the plants to transpire.  The process of transpiration enables the mass flow of mineral and water from the roots to the shoots and thus maintains the osmotic pressure of the cells and cools the plants.
  • Question 2
    1 / -0
    The transportation of food in phloem is
    Solution
    The transportation of food through Phloem takes place both in acropetal and basipetal direction, that is, from source to the sink. In basipetal transportation the movement of food is from the leaves to the root, while in acropetal transportation the movement of food is from storage organs like root to the leaves.
    So, the correct answer is 'Both A and B'
  • Question 3
    1 / -0
    When a plant is girdled
    Solution
    In girdling experiments phloem is removed so food cannot be transported to locations beyond the point of girdling. Hence root of such a plant dies because food supply from leaves is cut off.
  • Question 4
    1 / -0
    Bidirectional translocation of materials takes place in
    Solution
    The plant carries photosynthesis during the growth and stores the prepared food in the leaves which is further channelized to the different part of the body. The phloem conducts the food from the source to the sink (the part of the plant requiring or storing food). During spring, this process is reversed as the food stored in the sink is mobilised toward the growing buds of the plant, through the phloem. Thus, the movement of food in the phloem is bidirectional. So, the correct answer is option B.
  • Question 5
    1 / -0
    The shoot pressure is measured by
    Solution
    Scholander et al. (1965) were the first to measure the pressure / tension directly by using pressure chamber method or pressure bomb technique. A pressure bomb or pressure chamber or Scholander bomb is an instrument with which it is possible to measure the approximate water potential of plant tissues. 
  • Question 6
    1 / -0
    By many evidences, it can be known that the downward movement of food takes place through
    Solution
    Movement of food takes place through phloem tissue. This can be demonstrated through ringing experiment in which, if ring of vascular tissue including phloem is removed in a dicot tree. The plant parts located below the point of ringing will die because these parts do not get food.
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    Who has used two bulbs of semipermeable membrane to explain pressure flow theory?
    Solution
    Munch (1930) explained pressure flow theory. He postulated the mass flow of organic solute takes place from the site of higher concentration to the site of lower concentration. According to it model, phloem sap moves from sugar sources to sugar sinks through turgor pressure, due to the high concentration of organic substances inside source cell. This result in movement of food from source to sink. Thus, the correct option is A.
  • Question 8
    1 / -0
    Munch hypothesis is based on
    Solution
    Munch proposed bulk transport theory to explain transportation of sugars in plants. At the site of synthesis i.e., leaves sugars are synthesised, which leads to an increase in osmotic pressure inside leaf mesophyll due to which water from xylem moves inside mesophyll cells. At the site of sugar utilisation, sugars are used up and so water moves from inside the cells to the xylem vessels. The difference in sugar concentration at source and sink creates a pressure gradient and sugars move in bulk from source to sink.
    So, the correct answer is option B.
  • Question 9
    1 / -0
    Leaf photosynthates are transported to other parts of higher plants through
    Solution
    Phloem is involved in transport of sugars. Phloem cells are living cells, which carry out the physiological process of sugar transport in higher plants.
  • Question 10
    1 / -0
    The term 'water potential' was proposed by
    Solution
    Water potential is a modern term, which is being used in place of DPD. This term was first used by Slatyer and Taylor(1960). Water potential is the difference in chemical potential of water, i.e., free energy per unit molal volume, in a system over its pure state at the same temperature and pressure.
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