1. What is the function of the
nervous system?
ANS: The nervous system controls and
co-ordinates all the activities of our body.
2. List down the main organs of
the nervous system.
ANS: The main organs of the nervous
system are, brain, spinal cord, nerves and sense organs.
3.
Name the most delicate part of the human nervous system.
ANS: Brain
4. The brain is protected by
the _____.
ANS: skull
5. The weight of the human
brain is about _____ kg.
ANS: 1.35 kg
6. The _____ portion of the
brain controls the left part of the body.
ANS: right
7. The ______ portion of the
brain controls the right part of the body.
ANS: left
8. By the age of five, a
child’s brain reaches _____ per cent of its full weight.
ANS: 90 per cent
9. Name the parts of the human
brain.
ANS: The parts of the human brain
are, cerebrum, cerebellum and medulla.
10. Name the tube-like
structure attached to the brain.
ANS: spinal cord
11.
The length of the spinal cord is about _____ long.
ANS: 50 cm
12. State the function of the
spinal cord.
ANS: It carries messages from the
brain, to all parts of the body, and from the body parts, back to the brain.
13. Name the structure that
protects the spinal cord.
ANS: back bone (spinal cord)
14. The nervous system consists
of billions of _____.
ANS: nerve cells
15. The messages (sensations)
travel throughout the body as a _____.
ANS: small electrical current (nerve
impulse)
16. Define nerve impulse.
ANS: The electrical signals through
which the sensations travel throughout the body are called nerve impulse.
17. Nerves are of ___ types.
ANS: two
18. Name the two types of
nerves.
ANS: The two types of nerves are,
sensory nerves and motor nerves.
19. The _____ nerves carry
message from sense organs to the brain.
ANS: sensory nerves
20. The ____ nerves carry
commands from the brain to the muscles.
ANS: motor nerves
21. The ____ gives commands to
the muscles.
ANS: brain
22. Human brains have _____
major sense organs for different senses.
ANS: five
23. Name the sense organs of
our body.
ANS: The sense organs of our body
are, nose, eyes, ears, skin and tongue.
24. The nose is sensitive to
____.
ANS: smell
25. Our eyes are sensitive to
_____.
ANS: light (vision)
26. We blink about ____ times
on an average.
ANS: six
27. Our ears are sensitive to
____.
ANS: sound (hearing)
28. The skin is sensitive to
____.
ANS: touch
29. The tongue is sensitive to
_____.
ANS: taste
30. There are about _____ taste
buds on our tongue.
ANS: 10,000
31. State the functions of
sense organs.
ANS: The sense organs, on receiving a
message, in the form of a sensation (smell, touch, taste, vision and sound),
send it to the brain through the sensory nerves.
32. State the function of
sensory nerves.
ANS: The sensory nerves carry message
from the sense organs to the brain.
33. State the function of motor
nerves.
ANS: The motor nerves carry commands
from the brain to the muscles.
34. Why is it important to
remove waste products from the body?
ANS: The waste products if
accumulated may become poisonous for the body. So, it is important to remove
them.
35. Name the system which helps
in removing the waste products from our body.
ANS: excretory system
36. How waste products are
removed from the body through the skin?
ANS: The skin gets rid of water, and
excessive salts, in the form of sweat, through the sweat glands, located on the
skin.
37. The ____ glands are located
on the skin.
ANS: sweat glands
38. How the lungs help in removing
waste products from the body?
ANS: The lungs remove carbon dioxide
during respiration.
39. The faeces is eliminated
from the rectum, through the ____.
ANS: anus
40. ______ is the major waste
product of our human body and it is excreted in the form of _______.
ANS: urea is the major waste product
of our human body and it is excreted in the form of urine.
41. Name the parts of the human
urinary system.
ANS: The parts of the human urinary
system, kidneys, ureters, urinary bladder and urethra.
42. What is urine?
ANS: The waste products like urea are
removed from the human body in form of a light yellow coloured liquid called
urine.
43. There are _____ kidneys in
our body.
ANS: two
44. State the function of
kidney.
ANS: Kidney helps to remove waste
products like urea and excess water from the body.
45. There are _____ ureters in
our body.
ANS: two
46. What is the function of
ureters?
ANS: The ureters carry urine from the
kidney to the urinary bladder.
47. Name the part of the
urinary system where urine is stored.
ANS: urinary bladder
48. About _____ litres of urine
are excreted daily.
ANS: 1.5 to 2.5 litres
49. The urine from the body gets
discharged through the _____.
ANS: urethra
50. Name the opening of the
human urinary system.
ANS: urethra
51. Name the parts which make
the human skeleton system.
ANS: Skull, backbone, ribs, hip bones
and bones of arms and legs make the human skeleton system.
52. State the functions of the
skeleton system.
ANS: The functions of the skeleton
system are as follows,
(i) It gives shape to the body
(ii) It helps in the movement of the
body with the help of muscles.
(iii) It protects the soft, delicate,
and internal organs of the body from injuries.
53.
How the bones are joined together?
ANS: The bones are joined together by
ligaments.
54. What are ligaments?
ANS: The ligaments are the elastic
strands that join bones together.
55. How the muscles are
attached to bones?
ANS: The muscles are attached to the
bones by tendons.
56. What are tendons?
ANS: The tendons are the non-elastic
tissues that attach muscles to bones.
57. Distinguish between ligaments
and tendons.
ANS:
|
Ligaments |
Tendons |
|
Ligaments connect bones to bones. |
Tendons attach muscles to bones. |
|
These are elastic tissues. |
These are non-elastic tissues. |
58. How do bones move?
ANS: The muscles which are attached
to the bones contract and relax. This helps the bones to move.
59. The human skeleton of an
adult is made up of ____ bones.
ANS: 206
60. The male reproductive
system has a pair of _____.
ANS: testes
61. Sperms are produced by the
_____.
ANS: testes
62. The female reproductive
system has a pair of ____.
ANS: ovaries
63. Eggs are produced by the
_____.
ANS: ovaries
64. Name the process of fusion
of an egg with a sperm.
ANS: fertilisation
65. Define fertilisation.
ANS: The process of fusion of an egg
with a sperm is called as fertilisation.
66. The fertilised egg develops
into an ______.
ANS: embryo
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