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Transport in Plants Test - 42

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Transport in Plants Test - 42
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  • Question 1
    1 / -0
    Process by which both living and dead tissues absorb water ?
    Solution
    It is a process by which both living and dead tissues absorb water. This is because the substances like cellulose and proteins have great affinity for water. i.e., they are hydrophilic.
  • Question 2
    1 / -0
    When dried seeds are placed in water they absorb water and swell this because of
    Solution
    The substances like cellulose and proteins have great affinity for water i.e., they are hydrophilic this property is called inhibition. When dried seeds are placed in water they absorb water and swell similarly. If dried fruits or raisins are placed in water they imbibe water. You might have noticed that during rainy season wooden doors also absorb some moisture and it becomes difficult to close the doors many components of cells like starch and cellulose attract water. When seed coats get ruptured and process of germination of seed takes place.
    So, the correct answer is 'Both'.
  • Question 3
    1 / -0
    If the stem of the plant is cut just above the root then
    Solution
    Root pressure can be defined as the pressure exerted by the cortical cells of the root upon the sap in the xylem vessels which pushes the sap upwards if the stem of the plant is cut just above the root, water seeps or exudes out of the cut end of the stem for a considerable period of time. This indicates that there is a force pushing water up the stem from the roots.
  • Question 4
    1 / -0
    Root pressure helps in

    i Continuous flow of water in plants
    ii Pulling force
    iii Replacement of lost water
    Solution
    Root pressure provides a force which causes pushing of water in a stem. A continuous flow of water is maintained in the plants because the leaves transpire water through stomata and to replace the lost water the water drawn by the roots moves up.
  • Question 5
    1 / -0
    The pressure applied to stop the flow from low concentration solution to high concentration through a semipermeable membrane is
    Solution
    The movement of water from high to low concentration results in the decrease in the amount of water from the area from where water is transferred. The pressure which is just sufficient to stop the flow of solvent from the weaker solution to the concentrated solution through a selectively permeable membrane is termed as osmotic pressure.
  • Question 6
    1 / -0
    Food substances travel up and down through
    Solution
    Xylem is a type of vascular tissue in plants that transports water and solutes from the roots to the leaves. Phloem is the vascular tissue in plants which conducts sugars and other metabolic products (food) upward and downwards from the leaves.
    Thus, the correct answer is option B.
  • Question 7
    1 / -0
    Movement of food in plants is known as ______________.
    Solution
    Phloem transports synthesized food from the leaves to the rest of the plant body. The transport of water along with food from one part of a plant to another is called as translocation. 
    So, the correct answer is option C.
  • Question 8
    1 / -0
    Food is transported in leaves with the help of
    Solution
    The food manufactured in the leaves is translocated upwards, downwards and laterally to all parts of the plant through the phloem. The phloem also conducts some other substances such as amino acids. The conducting cells of the phloem are cylindrical cells called sieve tubes, which have sieve like partitions at both ends. These partitions are called as sieve plates. 
  • Question 9
    1 / -0
    A vascular tissue in land plants primarily responsible for the distribution of sugars and nutrients manufactured in the shoot is
    Solution
    Xylem conducts water and minerals to different parts of the body which can be used for photosynthetic reaction and for several metabolic processes.
    Phloem is responsible for transporting sugars, proteins and other organic molecules in plants. It is a vascular tissue in land plants primarily responsible for the distribution of sugars and nutrients manufactures in the shoot.
    So, the correct answer is option B.
  • Question 10
    1 / -0
    Phloem tissue is responsible for
    Solution
    Phloem tissue is responsible for translocation, which is the transport of soluble organic substances, e.g., sugar. The substances travel along sieve elements, but other types of cells are also present: the companion cells, parenchyma cells, and fibres.
    So, the correct answer is option A.
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