The nervous system consists of the brain, spinal cord, and nerves. The brain is responsible for thinking in the cerebrum. When the hand touches something hot, the spinal cord commands the hand to remove itself. Sensory nerves carry messages from sense organs like the skin, eyes, and tongue to the brain and spinal cord. The skin is the largest sense organ and contains nerve endings sensitive to stimuli like heat and pain.

1. The Nervous System

2. 1. Which of this is a part of the
nervous system?
• Brain.
• Spinal cord.
• Nerves.
• All of these.

3. 2. In the human brain thinking is
done by the -
• Cerebrum.
• Cerebellum.
• Medulla.
• Spinal cord.

4. 3. If your hand accidentally touches
a hot glass, the command to
remove the hand in given by –
• Medulla.
• Cerebrum.
• Spinal cord.
• Skin on the hand.

5. 4. The nerves that carry messages
from sense organ to brain / spinal
cord are -
• Mixed nerves.
• Sensory nerves.
• Motor nerves.

6. 5. The coloured part of the eye is
called -
• Iris.
• Cornea.
• Pupil.
• Retina.

7. 6. These help us to maintain our
body balance -
• Only the inner ear.
• Inner ear and cerebrum.
• Inner ear and cerebellum.
• Ear and nose.

8. 7.The largest sense organ in our
body -
• Eye.
• Skin.
• Tongue.
• None of the above.

9. 8. In which sense organ are the
nerve endings sensitive to heat,
pressure , cold and pain ?
• Eyes.
• Skin.
• Tongue.
• Nose.

10. 9.The part of the brain that works
even when we sleep -
• Cerebrum.
• Cerebellum.
• Medulla.
• All the above.

11. 10.The part of the eye where
images are formed -
• Cornea.
• Lens.
• Optic nerve.
• Retina.