Control & Coordination

NCERT Exemplar Problems

MCQs Part 2

Question 11: 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

Question 12: Which of the following is not associated with growth of plant?

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

Question 13: Iodine is necessary for the synthesis of which hormone?

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

Question 14: 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

Question 15: Select the mis-matched pair

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

Question 16: 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

Question 17: 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

Question 18: The growth of pollen tubes towards ovules is due to

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

Question 19: 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