Control and Coordination class 10 science NCERT Exemplar problems solution mcq part 2

Control & Coordination

Exemplar Problems MCQ II

The main function of abscissic acid in plants is to

  1. Increase the length of cells
  2. Promote cell division
  3. Inhibit growth
  4. Promote growth of stem
    Answer: (c) Inhibit growth

The growth of tendril in pea plants is due to

  1. Effect of light
  2. Effect of gravity
  3. Rapid cell divisions in tendrillar cells that are away from the support
  4. Rapid cell divisions in tendrillar cells in contact with the support
    Answer: (c) Rapid cell divisions in tendrillar cells that are away from the support

The growth of pollen tubes towards ovules is due to

  1. Hydrotropism
  2. Chemotropism
  3. Geotropism
  4. Phototropism
    Answer: (b) Chemotropism

The movement of sunflower in accordance with the path of sun is due to

  1. Phototropism
  2. Geotropism
  3. Chemotropism
  4. Hydrotropism
    Answer: (a) Phototropism

The substance that triggers the fall of mature leaves and fruits from plants is due to

  1. Auxin
  2. Gibberellin
  3. Abscissic acid
  4. Cytokinin
    Answer: (c) Abscissic acid

Which of the following is not associated with growth of plant?

  1. Auxin
  2. Gibberellins
  3. Cytokinins
  4. Abscissic acid
    Answer: (d) Abscissic acid

Iodine is necessary for the synthesis of which hormone?

  1. Adrenaline
  2. Thyroxin
  3. Auxin
  4. Insulin
    Answer: (b) Thyroxine

Choose the incorrect statement about insulin

  1. It is produced from pancreas
  2. It regulates growth and development of the body
  3. It regulates blood sugar level
  4. Insufficient secretion of insulin will cause diabetes
    Answer: (b) It regulates growth and development of the body

Select the mis-matched pair

  1. Adrenaline: Pituitary gland
  2. Testosterone: Testes
  3. Estrogen: Ovary
  4. Thyroxin: Thyroid gland
    Answer: (a) Adrenaline: Pituitary gland

The shape of guard cells changes due to change in the

  1. Protein composition of cells
  2. Temperature of cells
  3. Amount of water in cells
  4. Position of nucleus in the cells
    Answer: (c) Amount of water in cells


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