Class 10 Biology



Control & Coordination

Exemplar Problems MCQ II

The main function of abscissic acid in plants is to

  • Increase the length of cells
  • Promote cell division
  • Inhibit growth
  • Promote growth of stem
    Answer: (c) Inhibit growth

The growth of tendril in pea plants is due to

  • Effect of light
  • Effect of gravity
  • Rapid cell divisions in tendrillar cells that are away from the support
  • 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

  • Hydrotropism
  • Chemotropism
  • Geotropism
  • Phototropism
    Answer: (b) Chemotropism

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

  • Phototropism
  • Geotropism
  • Chemotropism
  • Hydrotropism
    Answer: (a) Phototropism

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

  • Auxin
  • Gibberellin
  • Abscissic acid
  • Cytokinin
    Answer: (c) Abscissic acid

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

  • Auxin
  • Gibberellins
  • Cytokinins
  • Abscissic acid
    Answer: (d) Abscissic acid

Iodine is necessary for the synthesis of which hormone?

  • Adrenaline
  • Thyroxin
  • Auxin
  • Insulin
    Answer: (b) Thyroxine

Choose the incorrect statement about insulin

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

Select the mis-matched pair

  • Adrenaline: Pituitary gland
  • Testosterone: Testes
  • Estrogen: Ovary
  • Thyroxin: Thyroid gland
    Answer: (a) Adrenaline: Pituitary gland

The shape of guard cells changes due to change in the

  • Protein composition of cells
  • Temperature of cells
  • Amount of water in cells
  • Position of nucleus in the cells
    Answer: (c) Amount of water in cells