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Plant Growth and Development Test - 17

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Plant Growth and Development Test - 17
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  • Question 1
    1 / -0
    Phototropism in shoots is attributed to ................
    Solution
    Auxins also play a part in phototropism, an occurrence that involves plants bending or moving away from light. The shoot tip is responsible for directional movement by the plant in response to sunlight, as this is the area where auxins can be found. Sunlight eradicates auxin, meaning that the part of the shoot tip of the plant which is receiving direct sunlight will have the least amount of auxin. The extra auxin present on the shaded side promotes more cell division and elongation, causing the plant to bend towards the sunlight after this lop - sided growth.
  • Question 2
    1 / -0
    Commonly used auxin in callus and suspension cultures, is .............
    Solution
    2, 4 - D is the synthetic auxin, which is commonly used in callus as well as suspension cultures. Both the propagation of cells, as well as the differentiation of embryos was inhabited by a continuous application of these growth regulators. For this reason, a long period on medium lacking growth regulators was necessary before the differentiation of embryos occurred again.
  • Question 3
    1 / -0
    One of the commonly used plant growth hormone in tea plantation is
  • Question 4
    1 / -0
    Auxins inhibits the growth of
    Solution
    Apical dominance is the phenomenon, where the main central stem of the plant is dominant over other side stems; on a branch the main stem of the branch is further dominant over its own side branchlets. Apical dominance is shown by auxin hormone. Thus it prevents the lateral growth, but results in the growth of plant length - wise.

  • Question 5
    1 / -0
    Pollen extract stimulates the formation of fruit in the unpollinated carpel because extract has which of the following hormone?
    Solution
    Pollen grain which are the male gametes will stimulate the formation if fruit in an unpollinated carpel because of the presence of auxin hormone. This condition is called as parthenocarpy which is more stimulated in the presence of auxin hormone.
    So, the correct answer is 'Auxin'
  • Question 6
    1 / -0
    Plant hormone which is translocated to other parts for growth of the plant is known as .............
    Solution
    Indole-3-acetic acid is the most common naturally occurring plant hormone of the auxin class. It is the best known of the auxins and has been the subject of extensive studies by plant physiologists. IAA is translocated to different parts of the plant for growth.
  • Question 7
    1 / -0
    The movement of auxin is largely 
    Solution
    Auxin is a prominent plant hormone that has several functions in plants. It shows polar movement. It is basipetal in the stem but acropetal (from root tip towards shoot) in the root. 
    So, the correct answer is (A).

  • Question 8
    1 / -0
    The substances which have proved very effective in inducing root from the cut end of the stem is
    Solution
    Many new plants are usually propagated by stem cutting. Dipping the lower stem cuttings in a dilute solution of auxins (IBA) will result in the development of a large number of roots on the cut ends, which can ultimately develop into a whole plant.
  • Question 9
    1 / -0
    IAA and serotonin are derived (formed) from which of the following?
    Solution
    The amino acid tryptophan is an indole derivative and the precursor of the neurotransmitter serotonin. It is also found out as the precursor for IAA as a result of studies in cucumber,
  • Question 10
    1 / -0
    Which of the following prevents falling of fruits?
    Solution
    Naphthalene acetic acid (NAA) is a synthetic form of the plant hormone auxin. There are different physiological effects of the auxins on the growth of the plants. These regulators prevent the falling or dropping of the fruits and vegetables. They increase the fall time for dropping of the fruits from the thin stems after the maturation or ripening of the fruit takes place. 
    Thus, the correct answer is option B. 
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