Control and coordination Worksheet-17

Control and coordination Worksheet-17

Subjective questions:

41. How many cranial nerves are present in a mammal?

42. How many spinal nerves are present in man?

43. What is the basic function of a receptor?

44. Name the hormones that control the metabolism of calcium and phosphorus.

45. Mention the function of fore-brain.

46. Give technical terms for following events :

(a) The movement of plant in the direction of light.

(b) The movement of plant parts in response to water.

(c) The movement of plant parts towards chemical substance.

(d) The downward movement of roots in response to gravitational force.

47. Name the pigment present in plant which perceives light stimulus.

48. Name the endocrine gland which is present just above the heart.

49. Name the endocrine gland which is four-lobed.

50. Name the largest and second largest part of the brain.

51. Mention the various -components of hind-brain.

52. Name the part of the brain which controls equilibrium and posture of the body.

53. Name the reflex centre of the brain.

54. Name the structural and functional unit of nervous system.

55. Write the functions of cerebral hemisphere.

56. Name the growth regulator found in plants.

57. Give the role of cytokinin in plants.

58. Which plant growth regulator is found in the form of gas?

59. Name the growth regulator which promotes stem elongation.

60. Explain the position of pituitary gland.

Answer:

41. 12 pairs of cranial nerves are present in a mammal.

42. 31 pairs of spinal nerves are present in man.

43. The basic function of a receptor is to receive a particular stimulus and convert it into electrical potential changes that can run along a nerve fibre.

44. Calcitonin and Parathormone.

45. Fore brain is the region for mental abilities, memory, reasoning, speech and consciousness.

46. (a) Phototrophism (b) Hydrotropism (c) Chemotropism (d) Geotropism.

47. Chlorophyll.

48. Thyroid gland.

49. Parathyroid gland.

50. Cerebrum is the largest part of the brain. Cerebellum is the second largest part of the brain.

51. Various components of hind brain are cerebellum, pons and medulla oblongata.

52. Cerebellum part of hind brain.

53. Medulla oblongata.

54. Neuron or nerve cell.

55. Cerebral hemispheres controls intelligence, memory, speech and voluntary muscular movement.

56. Auxins, Gibberellins, Cytokinihs, Abscisic acid and Ethylene.

57. Cytokinins suppress apical dominance and lead to the growth and germination of seeds.

58. Ethylene.

59. Gibberellins.

60. Pituitary gland is situated at the base of brain, i.e., hypothalamus by a thin stalk called infundibulum just behind the optic chiasma.