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Plant Growth and Development Test - 68

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Plant Growth and Development Test - 68
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  • Question 1
    1 / -0
    Consider the following statements regarding growth movements in plants.
    a. Growth movements in flowering plants are always induced by external stimuli such as light and gravity.
    b. Differential growth of cells in different parts of the affected organ is responsible for growth movement.
    c. Growth movements are very slow and can be observed only through timelapse photography.
    Of these statements.
  • Question 2
    1 / -0
    Assertion (A): Tissues removed from crown gall tumours can be grown in culture without the addition of auxin and cytokinin.
    Reason (R): The bacterial plasmid contains the genes for the synthesis of plant auxin and cytokinin.
  • Question 3
    1 / -0
    What prevents over-ripening of banana and browning of cut fruits?
    Solution
    • Lemon juice helps keep the apple from browning because it is full of ascorbic acid (Vitamin C) and it has a low (acidic) pH level. Ascorbic acid works because oxygen will react with it before it will react with the polyphenol oxidase. However, once the ascorbic acid gets used up, the oxygen will start reacting with the enzyme and browning will occur. Lemon juice's low pH level also helps prevent browning. Polyphenol oxidase works best when the pH level is between 5.0 and 7.0. However, below a pH level of 3.0, the enzyme becomes inactivated. The pH of lemon juice is in the 2.0 range, making it very effective against browning.
    • Hence Ascorbic acid prevents over-ripening of banana and browning of cut fruits.
    • So, the correct answer is 'Ascorbic acid'.
  • Question 4
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    Which one of the following generally acts as an antagonist to gibberellins?
    Solution
    Gibberellins and Abscisic Acid (ABA) are antagonistic to each other. Gibberllins promotes seed germination whereas ABA promotes seed dormacy.
  • Question 5
    1 / -0
    Hormone that is associated with retaining the chloroplast chlorophyll is ?
    Solution
    Cytokinin is a plant hormone which acts as plant growth regulator. It is associated with retaining the chloroplast chlorophyll in the leaves. The cytokinin has anti-senescence effect on the plant. It delays the senescence of the leaves and prevents the destruction of chloroplast.
    Thus, the correct answer is option C.
  • Question 6
    1 / -0
    The activity of alpha-amylase in the endosperm of barley plants is induced by _____________.
  • Question 7
    1 / -0
    The living differentiated cell which have lost capacity to divide can regain capacity of division under certain conditions. This phenomenon is called
    Solution
    Differentiation is the process by which cells move from a less specialized (such as stem cells) form to a more specialized form having a specific function. Dedifferentiation is the process whereby completely differentiated cells regress to a simpler state (such as stem cells) and gain the capacity to divide again. The process by which a group of once specialized cells (de-differentiated) return to their original specialized state is known as redifferentiation. Regeneration is the process of renewal or restoration of growth to recreate damaged tissues, limbs etc. So, the correct answer is 'dedifferentiation'.
  • Question 8
    1 / -0
    The plant hormone which promotes parthenocarpy (formation of seedless fruit) is
    Solution
    Parthenocarpy is the natural or artificial production of fruit without seeds in plants.
    Plant hormones like auxin, gibberellin or gibberellic acid and cytokinins stimulate the development of parthenocarpic fruits when sprayed on flowers.
    Thus, the correct answer is option D.
  • Question 9
    1 / -0
    Which of the following statements are correct?
    a. Gibberellins can substitute light treatment
    b. Gibberellins can convert biennials into annuals
    c. Gibberellins favour flowering in long day plants
    c. Gibberellins induce flowering in short day plants.
    Select the correct answer.
  • Question 10
    1 / -0
    The formation of gibberellins is necessary during the germination of barley seeds for the synthesis and secretion of hydrolase's. The gibberellins is formed in the _____________.
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