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Plant Growth and Development Test - 50

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Plant Growth and Development Test - 50
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Presence of ethylene gas causes fruits to ripen. As fruit ripens, it produces increasing amounts of ethylene.

    This is an example of
    Solution
    ethylene gas is an aging hormone used for fruit ripening but may also cause the plant to die. Ethylene gas is released when the plant is damaged mechanically or physically.
    So the correct option is 'Positive feedback.'
  • Question 2
    1 / -0
    What could an experiment do to test the hypothesis that the response to light involves differential cell elongation?
    Solution
    Differential cell elongation is a widely used developmental program used in plants to respond to external and endogenous signals like that of light. 
    In order to test the response to light involves differential cell elongation, the marks are made on the seedling beforehand and the distance betweent he seedlings is measured. Once the seedling bends, the distance between the marks that have been made can be measured which should be different from the original distance, thereby indicating that response to light involves differential cell elongation.
  • Question 3
    1 / -0
    Apical dominance in plants is caused by
    Solution
    Auxin is a plant growth hormone used to promote initiation of adventitious roots and are the active ingredient of the commercial preparations used in horticulture to root stem cuttings. They can also be used to promote uniform flowering, to promote fruit set, and to prevent premature fruit drop. 
    Typically, the end of a shoot contains an apical bud, which is the location where shoot growth occurs. The apical bud produces an auxin (IAA) that inhibits the growth of the lateral buds further down on the stem towards the axillary bud and promote the stem elongation.
  • Question 4
    1 / -0
    Artificial ripening of fruits is accomplished by treatment with 
    Solution
    Ethylene is the chemical that is produced in the fruits in the natural ripening process. But in the artificial process calcium carbide that produces acetylene acts as ripening agent. Thus, the correct option is B
  • Question 5
    1 / -0
    A student had heard in his biology class that placing a ripe apple into a closed container with an unripe fruit would cause the unripe fruit to ripen. The student set up an experiment in which an unripe banana was placed into a paper bag. A second unripe banana was placed into a separate bag with a ripened apple and sealed shut. Both bags were allowed to sit undisturbed at room temperature for 48 hours. The student noted that after 48 hours, the first banana was still green and unripe. The second banana was yellow and soft to the touch.
     Which statement best represents a conclusion the student might reach?
    Solution
    The second banana which was placed with a ripened apple became yellow and soft because it got ripened in presence of apple. This happened because of secretion of 'Ethylene' by the apple. Ethylene is a gaseous hormone and promotes fruit ripening. It is secreted by all parts of seed plants. As the Ethylene was secreted by the apple, the banana which was placed with apple got ripened under the influence of Ethylene.
    Hence the student might reach the conclusion that the apple emitted a substance (the gaseous hormone ethylene) that caused the banana to ripen in its presence.
    So, the correct answer is 'The apple emitted a substance that caused the banana to ripen in its presence'.
  • Question 6
    1 / -0

    The key feature of vernalization is

    Solution
    In many plants, the temperature has a profound effect on flowering. Some plants do not flower under the inductive photoperiod conditions but flower when a cold temperature treatment is given to them. This acquisition or acceleration of the ability to flower by a chilling treatment is said to be vernalization. It is the method of inducing early flowering in plants by pretreatments of their seeds at a very low temperature. Thus option B is the correct answer. 
  • Question 7
    1 / -0
    During the development, zygote shows
    Solution
    • Differentiation is the ability of the cells to be specialized and perform specific functions. 
    • The zygote is formed by the fusion of male and female gametes. The zygote undergoes division and forms a group of undifferentiated and unspecialized cells.
    • These cells further divide and differentiate to form specialized organs. 

    So, the correct answer is option A.
  • Question 8
    1 / -0

    The xylem which differentiates has a thick secondary wall made of

    Solution
     Xylem cells are dead and elongated hollow cells consists of secondary cell wall contains lignin.
    So the correct option is 'Lignin.'
  • Question 9
    1 / -0
    Reduction in transpiration is a function of which of the following differentiated cell?
    Solution
    Trichomes are the differentiated cells. These are the small hairy outgrowth on the leaf surface. These hair like structures block air flow across the surface of leaf thereby reducing water loss from plants by the process of transpiration. Thus the correct answer is option A.
  • Question 10
    1 / -0
    The phenomena of vernalization is discovered by the
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