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Transport in Plants Test - 31

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Transport in Plants Test - 31
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  • Question 1
    1 / -0
    Phloem tissues in plants are responsible for
    Solution
    Phloem transports food materials, usually from leaves to other parts of the plant. Phloem is a vascular tissue in land plants primarily responsible for the distribution of food synthesized by the leaves. It is fully developed in gymnosperm and angiosperm.
    So, the correct answer is option B.
  • Question 2
    1 / -0
    Which of the tissue is more important for translocation of sucrose?
    Solution
    Translocation of organic nutrients from the region of source or supply to the region of sink or utilisation is mostly in the form of sucrose. Phloem (sieve tubes or sieve cells) is the pathway for this translocation, as found put by stem girdling, sieve tube puncturing, radioautography and chemical analysis of sieve tube sap.
  • Question 3
    1 / -0
    The cause of guttation is mainly due to
    Solution
    Guttation is a loss of water from plants in liquid form through hydathodes. The force responsible for guttation is positive root pressure. Guttation is easily observed when transpiration rate is low and soil is well watered.
    So, the correct answer is option A.
  • Question 4
    1 / -0
    Organic substances such as sugars are translocated in phloem can be demonstrated by
    Solution
    Translocation of organic substances is the movement of organic nutrients from the region of the source to sink. Phloem (sieve tubes or sieve cells) is the pathway for this translocation, as proved by stem girdling, sieve tube puncture, radio autographs and sieve tube analysis experiment.
    So, the correct answer is option B.
  • Question 5
    1 / -0
    One molar solution of which substance will have maximum O.P?
    Solution
    Osmotic pressure depends on the number of solute particles in the solution. One molecule of sodium chloride in aqueous solution will give rise to two particles-one sodium and another chlorine ion. 
    All the other compounds will remain as one particle only. Thus, in one molar solution of sodium chloride twice the number of particles will be present as compared to one molar solution of other compounds. Thus, osmotic pressure of one molar solution of sodium chloride will be maximum.
  • Question 6
    1 / -0
    Mass-flow hypothesis is also known as
    Solution
    • Mass flow hypothesis is also known as pressure flow hypothesis. This theory was proposed by Ernst Munch. According to this theory, the movement of sap through the phloem occurs by mass flow from the sugar-rich area to the sugar-deprived area.
    • The sugar molecules produced by the process of photosynthesis moves from leaves into the phloem cells through active transport.
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    Osmosis is the diffusion of solution of a weaker concentration, when both are separated by semi-permeable membrane. What is error in the statement?
    Solution
    Osmosis is defined as the movement of solvent (water in living systems) molecules from a region of their high concentration (less concentrated solution) to a region of their lower concentration (more concentrated solution), across a semi-permeable membrane.
  • Question 8
    1 / -0
    Osmosis means transfer of 
    Solution
    During osmosis, water flows from a region of its own higher concentration (less concentrated solution) to a region of its own lower concentration (more concentrated solution) through a semi permeable membrane.
  • Question 9
    1 / -0
    The loss of water from the plants is known as
    Solution
    Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. Transpiration is essentially evaporation of water from plant leaves. Transpiration also cools plants, changes osmotic pressure of cells and enables mass flow of mineral nutrients and water from roots to shoots.
    Therefore, the correct answer is option B.
  • Question 10
    1 / -0
    Water enters into the root hair from the soil in its normal condition because the osmotic pressure of the soil solution
    Solution
    Plants obtain water and minerals from soil solution. The soil solution is a dilute solution of minerals. Because minerals i.e., solutes are present in low concentration in soil solution, the osmotic pressure of soil solution is low. Thus, it is hypotonic as compared to the solution in cell sap. The cell sap is a concentrated solution as compared to soil solution. Hence, plant roots are able to absorb water easily from soil.
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