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Plant Growth and Development Test - 11

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Plant Growth and Development Test - 11
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  • Question 1
    1 / -0
    A ripe mango, kept with unripe mangoes causes their ripening. This is due to the release of a gaseous plant hormone
    Solution
    Ethylene is a gaseous hormone which has many functions such as fruit ripening, flower wilting, and leaf fall. It is unusual because of its gaseous nature. Ethylene brings about change in colour, texture and softens the ripening fruits. Some fruits release ethylene as the ripening begins. Thus, the correct answer is option  D.
  • Question 2
    1 / -0
    Which hormone is responsible for phototropisms?
    Solution
    Growth curvature response of plants towards light is known as phototropism which is mediated by auxins in plants. Bending of the plant is caused by more elongation of the shaded part as compared to the lighter side, caused by increased auxin concentration on shaded side and decreased on the other side. Thus, the correct answer is option C.
  • Question 3
    1 / -0
    Phytocytomine is a
    Solution
    Phytocytomine is a plant growth regulator. It is a kind of kinetin. It is synthesized from Licheniformis bacillus.
  • Question 4
    1 / -0
    The plant hormone responsible for phototropism in plants is
  • Question 5
    1 / -0
    Artificial ripening of fruit is carried out by
    Solution
    Ethylene is sprayed on fruits to promote artificial ripening, which is very commonly seen in fruit shops.
    Ethylene is applied on fruits in the form of a spray. It acts to the fruit cell wall made of pectin or cellulose and promotes ripening.
  • Question 6
    1 / -0
    In living things growth happens _________. 
  • Question 7
    1 / -0
    Bananas can be prevented from overripening by
    Solution
    During ripening process, plants produce ethylene gas. To prevent overripening of bananas, the chemical reaction of ripening process needs to slow down. Cold temperatures will slow down the reaction and hence delay the ripening of banana. However, storing in freezer will slow down the ethylene emission more than refrigerating it.
    Thus, the correct answer is option D.
  • Question 8
    1 / -0
    Gaseous growth hormone is
    Solution
    Ethylene is the only gaseous plant hormone. It is also called as ripening hormone as it plays the important role in controlling the fruit ripening. During fruits ripening, the respiration rate in fruits is increased by ethylene. Due to increased respiration, complex carbohydrates are broken down into simpler sugars and cell wall becomes soft. It inhibits cell division. It is also involved in abscission of leaves, fruits and flowers.
    Thus, the correct answer is option D.
  • Question 9
    1 / -0
    Fruit ripening is accelerated by
    Solution
    Ethylene is a plant hormone. It is also called as ripening hormone. It is responsible for ripening of fruits. Fruit ripening is accompanied by increased rate of respiration. Ethylene rich atmosphere is used to accelerate the process of ripening of fruits like banana.
    Thus, the correct answer is option D.
  • Question 10
    1 / -0
    Growth of a shoot or a root involves
    Solution
    Growth is an irreversible increase in the size. There are three developmental stages of growth of all plant parts including shoot and root. These are cell division, cell enlargement and cell differentiation. Cell division is the first phase that results in increase in the number of cells. In plants, karyokinesis, division of nucleus is followed by cytokinesis, the division of the cytoplasm. Cell enlargement gives the proper size to the organ and tissue. During this, protoplasm, vacuole, etc are formed. Cell differentiation is seen at cell level, tissue level, organ level and at the level of an organism. The cells differentiate to form different types of tissues that later perform different but specific functions.
    Thus, the correct answer is option D.
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