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Plant Growth and Development Test - 15

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Plant Growth and Development Test - 15
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  • Question 1
    1 / -0
    Auxins were discovered by
    Solution
    Auxins were discovered by Went. Auxins are a class of plant hormones with some morphogen - like characteristics. Auxins have a cardinal role in coordination of many growth and behavioural processes in the plant's life cycle and are essential for plant body development.
  • Question 2
    1 / -0
    Growth is maximum in the zone of
    Solution
    Growth is estimated by an increase in cell number, area, volume, and length. Cell growth undergoes three major phases. They are as followed:
    a) During cell division, the meristematic cells divide rapidly to increase the number of cells. This increases the number of cells. 
    b) During the cell elongation phase, the newly formed cells elongate and increase in length and volume. It also shows increased vacuole formation and new cell wall deposition. Amount of protoplasm increases.
    c) During cell differentiation, the cell has achieved maximum growth and proceeds towards maturation to attain specific function.
    As, maximum increase in length and volume takes place in the cell elongation phase. It is considered as zone of maximum growth.
    So, the correct answer is 'Cell elongation'.

  • Question 3
    1 / -0
    The plant material which is widely used in the preparation of culture medium is
    Solution
    Cocis nucifera is the scientific name for coconut. Coconut water is mainly used as culture media. However, in an emergency, it can be even used as a substitute for human blood plasma.
  • Question 4
    1 / -0
    Evergreen trees remain green throughout the year on account of ..........
    Solution
    Evergreen trees are the trees which remain green throughout the year. It is because of their specialty of shedding a very few leaves in small intervals and not shedding entire leaves in a single season. So these, trees looks green forever and thus the name. Examples: blue spruce and red cedar.
  • Question 5
    1 / -0
    Falling of leaves occur as abscission layer is formed when the content of ...........
    Solution
    Abscission is a term used in several areas of biology to mean shedding of various parts of an organism. In plant sciences, it  most commonly refers to the process by which a plant drops one or more of its parts, such as leaf, fruit, flower or seed. Auxin inhibits abscission of leaves and fruits. Abscission layer is produced, when the auxin content falls below a minimum.
    So, the correct answer is 'Auxin decreases'
  • Question 6
    1 / -0
    A high concentration of synthetic auxin is generally used for ....................
    Solution
    Weeds are undesirable crops grown on a field along with the desired crop plant which results in poor yield from the crop. There are several synthetic auxins like 2, 4 - D, which is a famous herbicide or weedicide by which broad - leaved weeds can be destroyed but does not affect mature monocot plants, which are the desired crops.
  • Question 7
    1 / -0
    Indole-3-acetic acid called as auxin was first isolated from 
    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. It is the first naturally occurring auxin, which was isolated by Kogl and Haagen-Smit from human urine.
    So, the correct answer is option A.
  • Question 8
    1 / -0
    A well known naturally occurring auxin is or A natural growth regulator (hormone) is ........................
    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.
  • Question 9
    1 / -0
    Which of the following is not a naturally occurring plant hormone?
    Solution
    2, 4 - Dichlorophenoxyacetic acid is a common systemic herbicide used in the control of broadleaf weeds. It is one of the most widely used herbicides in the world. 2, 4 - D is a synthetic auxin and as such it is often used in laboratories for plant research and as supplement in plant cell culture media such as MS medium.
  • Question 10
    1 / -0
    Cell elongation in plants is caused by ....................... .
    Solution
    A- Auxin is a plant hormone produced in the stem and root tip that promotes cell elongation, stem and root growth. Auxins have four characteristic effects on plant growth: 1) Stimulating shoot elongation 2)Controlling seedling orientation 3)Stimulates root branching 4) Promoting fruit development.
    So the correct option is A.
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