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Plant Growth and Development Test - 45

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Plant Growth and Development Test - 45
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  • Question 1
    1 / -0
    A high concentration of synthetic auxin is generally used for 
    Solution
    2,4-D is the abbreviated form of 2,4-Dichlorophenoxyacetic acid. It is a chemical compound which is commonly used as a weedkiller. It is the synthetic form of auxin. The compound was used by the U.S. military to clear the trees by defoliation. These are used for clearing the areas of woody trees and some other herbaceous weeds. These hormones cause defoliation of the trees and thereby, killing the trees. 
    Thus, the correct answer is option A. 
  • Question 2
    1 / -0
    The bending of the stem of a plant towards light is due to the action of
    Solution
    The bending of the stem of a plant towards light is called as phototropism. 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.
    Therefore, the correct answer is option D.
  • Question 3
    1 / -0
    Auxin promotes
  • Question 4
    1 / -0
    Ethylene is a
    Solution
    Ethylene is a simple gaseous plant growth regulator (PGR). It is synthesised in large amounts by tissues undergoing senescence and ripening fruits. the hormone enhances the respiration rate during ripening of the fruits. Ethylene helps fruits ripen by making them softer, through the breakdown components of the cell walls, and sweeter, through the conversion of starches to sugars.
    Thus, the correct answer is option A.  
  • Question 5
    1 / -0
    Auxin promotes
    Solution
    Auxins are plant hormones produced at the shoot tips. Indole-3-acetic acid is the main auxin found in plants. Auxins promote growth in fruits, they induce dormancy in seeds and buds and also cause opening of stomata.
    So, the correct answer is, 'All of these'.
  • Question 6
    1 / -0
    Most of the plant's auxin is produced in its
    Solution
    • The term ‘auxin’ is applied to the indole-3-acetic acid (IAA), and to other natural and synthetic compounds having certain growth-regulating properties.
    • They are mostly produced by the growing apices of the shoot and roots, from where they migrate to the regions of their action.
    • They help to initiate rooting in stem cuttings, an application widely used for plant propagation.
    • Hence Most of the plant's auxin is produced in its shoot apex.
    • So, the correct answer is 'Shoot apex'.
  • Question 7
    1 / -0
    The hormone which decreases the rate of growth in roots is 
    Solution
    Auxins produced in the terminal buds suppress the growth of side buds. They also affect cell elongation (tropism), apical dominance and fruit drop or retention. Auxin decreases the rate of growth in roots.
    Cytokinins are a group of hormones. These hormones promote cell division in plant roots and shoots, and they promote the growth of buds.
    Therefore, the correct answer is option A.
  • Question 8
    1 / -0
    Which ofthe following test will you perform to demonstrate the presence of gibberellin?
    Solution
    Gibberellins are growth promoting phytohormones. Gibberellins promote stem elongation in many plants. The application of this hormone causes an increase in the internodal regions which enhances the rosette formation in the leafy vegetables. This process is known as bolting which is commonly seen in the cabbage plants.
    Thus, the correct answer is option A. 
  • Question 9
    1 / -0
    Which of the following hormones can replace vernalization?  
    Solution
    Vernalization is acquisition of ability of plants to flower by chilling treatment. In absence of cold treatment, accumulation of ent-kaurenoic acid in shoot tip occurs. Cold treatment followed by exposure to high temperatures convert it into GA9GA_9, which stimulates flowering response in plants. Thus, gibberellins can substitute the vernalization. Thus, option B is correct. 
  • Question 10
    1 / -0
    Phototropic and geotropic movements in plants have been traced to be linked with 
    Solution
    Growth curvature response of plants towards light is known as phototropism which is mediated by auxins in plants. Auxin causes growth of seedling and shoots of mature plants to grow towards the light. Geotropism is directional growth of plant organs in response to gravity. Redistribution of auxin to lower side of horizontally growing root cells inhibits the growth of lower side of roots while the upper side grows normally which in turn curves the roots downwards. Thus, option D is correct. 
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