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Plant Growth and Development Test - 57

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Plant Growth and Development Test - 57
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  • Question 1
    1 / -0
    Which of the following stimulates growth or cell enlargement?
    Solution
    Auxin is a plant hormone that plays important role in plant growth. It stimulates stem elongation by increasing permeability of cells which in turn increases uptake of water by cells. It also increases the respiration rate.  It also enhances plasticity of cell walls which results in cell enlargement. 
    Thus, the correct answer is option B.
  • Question 2
    1 / -0
    Flowering in Pineapple is promoted by
    Solution
    Flowering in pineapple is not only based on external factors like temperature, daylength but also is based on internal factors like phytohormones. Pineapple flowering can be artificially induced by activity of the ethylene and IAA (indoleacetic acid). During flowering of pineapple, low temperature stimulates ethylene biosynthesis. Other hormones which are involved in initiating pineapple flowering are a-naphthalene acetic acid (NAA), indolbutiric acid (IBA), 2,4-dichlorofenoxiacetic acid (2,4-D). 
    Thus, the correct answer is option D.
  • Question 3
    1 / -0
    Cytokinins have the ability to
    Solution
    Cytokinins are plant hormones that are involved in various physiological processes. They promotes cell division by stimulating mitosis. Due to increased rate of mitosis, they induce shoot and root morphogenesis. They also plays important role in formation of fruits and seeds.
    Thus, the correct answer is option A.
  • Question 4
    1 / -0
    Artificial ripening of fruits/banana is accomplished by treatment with
    Solution
    Ethylene is a plant hormone. It is also called as ripening hormone as it is responsible for ripening of fruits. Fruit ripening is accompanied by increased rate of respiration. It inhibits cell division. Ethylene in gaseous form is used to accelerate the process of ripening of fruits like banana.
    Thus, the correct answer is option C.
  • Question 5
    1 / -0
    What causes a green plant to bend towards light as it grows?
    Solution
    Auxin is a plant hormone that plays important role in phototropism, growth movement in response to light. It promotes cell elongation. It is unequally distributed in the plant cells. It is transported towards the shady side and thus present in higher concentration. However, less auxin is transported towards the illuminated side. Due to this, the plant to grow more on the shaded side and bend in the direction of the light source. It shows phototropic response where faster cell elongation is seen on the shaded side than on the illuminated side. 
    Thus, the correct answer is option D.
  • Question 6
    1 / -0
    Cytokinin
    Solution
    Cytokinins is a plant hormone. It plays important role in cell division. It retards ageing senescence of plant parts. It delays destruction of chlorophyll. It has an effect on protein synthesis and mobilizing nutrients. 
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    Exactly opposite response of stem and root to gravity is because of
    Solution
    Auxin is a plant hormone that plays important role in the growth of stem and roots to gravity. Root shows positive gravitropism and shoot shows negative gravitropism. This exactly opposite response of stem and root is due to changes in concentration of the auxin. Roots bend towards gravity due to regulated movement of the auxin known as polar auxin transport. Stem and root cells require differential optimum concentration for elongation. In roots, auxin accumulates towards the gravity that results in the inhibition of cell expansion on the lower side and the curvature of the roots towards gravity. In stems, auxin accumulates towards the gravity. However, it results in increase in cell expansion and results in the shoot curving up.
    Thus, the correct answer is option A.
  • Question 8
    1 / -0
    Which one of the following is a natural growth inhibitor?
    Solution
    There are several plant hormones which regulates the plant growth. Hormones like gibberellic acid (GA), Indoleacetic acid (IAA), a type of auxin, cytokinin (CK) are growth promoter. Hormones like Abscisic Acid (ABA), ethylene are growth inhibitor. These hormones accelerate abscission process and are involved in inhibition of growth. Naphthaleneacetic acid (NAA) is a synthetic auxin hormone that promotes growth.
    Thus, the correct answer is option B.
  • Question 9
    1 / -0
    Hormone involved in phototropism is
    Solution
    The tropic movement of plant part in response to the sunlight is called phototropism. The stimulus for phototropism is a IAA hormone that is present at the tip of the stem and is responsible for bending towards light. When the tip of stem is cut, the decapitated plant does not bend towards light because of lack of IAA at the tip.
    Thus, the correct answer is option A.
  • Question 10
    1 / -0
    Bioassay of IAA is
    Solution
    Bioassay is a sensitive and specific test that determines the biological activity of hormones by measuring its effect on a specific part of plant material. There are various bioassays to determine the concentration of auxin hormone in plant such as Avena coleoptile test, split pea stem curvature test, cress root inhibition test. The Avena coleoptile curvature test is a bioassay for IAA (indole-3-acetic acid) that is dependent on differential growth due to the polar transport of IAA from the tip towards the base of coleoptiles in Avena. 
    So, the correct answer is 'Avena curvature test'
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