SSLC EXAM FINAL TOUCH | BIOLOGY

BIOLOGY

1. Identify the odd one and write the common feature of others.

Touch, Sound, Smell, Thirst

Thirst – Others are external stimuli.

2. Identify  the word pair relationship and fill the blanks.

Myelin sheath : Covers and protects axon

…………………… : Covers and protects brain

Meninges

3. Find out the correct statements related to myelin sheath from those given below.
4. a) Dendrons of all neurons are covered with myelin sheath.
5. b) Myelin sheath in the nerves are made up of schwann cells and that of brain and spinal cord is formed of oligodendrocytes.
6. c) Myelin sheath has dark colour.
7. d) Myelin sheath reduces the speed of impulses through axon.
8. b) Myelin sheath in the nerves are made up of schwann cells and that of brain and spinal cord is formed of oligodendrocytes.
9. Select the correct statement from the following related to myelin sheath.
10. a) Myelin sheath covers the dendrons of all neurons.
11. b) Schwann cells repeatedly encircle the axon to form Myelin sheath.
12. c) Myelin sheath has shiny white colour.
13. d) Myelin sheath decreases the speed of impulses through the axon.
14. b) Schwann cells repeatedly encircle the axon to form Myelin sheath.
15. c) Myelin sheath has shiny white colour.
16. Identify the parts of the nervous system with each of the following functions.
17. a) Plays a major role in the maintenance of homeostasis.
18. b) Acts as relay station of impulses
19. a) Hypothalamus
20. b) Thalamus
21. “Myelin sheath accelerates the speed of impulses through axon and provides nutrition to it.” How does myelin sheath form?

Myelin sheath is formed due to the repeated encircling of schwann cells around the axon.

7. Select the correct statements regarding the cerebrum.
8. a) Centre of thought, intelligence, memory and imagination.
9. b) Maintains equilibrium of the body
10. c) Sensations
11. d) Maintenance of homeostasis
12. a) and c)