Question

Tick the correct option (1x5=5)

I. The hinge joints allow movement in-

a) All direction

b) Two planes only

c) One plane only

d) Depends on where the joint is located in the body.

II. Unicellular organism-

(a) Human being

(b) Amoeba

(c) Earthworm

(d) Octopus

III. Light, spongy and hollow bones are features of –

(a) Terrestrial animals

(b) Areal animals

(c) Aquatic animals

(d) None of these

IV. How much of the Earth surface is covered with water?

(a) Exactly three-fourth

(b) About three-fourth

(c) About two-third

(d) About one-fourth

V. Most abundant gas in the Earth’s atmosphere is-

(a) Nitrogen

(b) Oxygen

(c) Argon

(d) Carbon dioxide​

Answer 1

Explanation:

a) Unicellular organisms have a one-celled body. True

(b) Muscle cells are branched. False

False- Because muscle cells are spindle-shaped.

(c) The basic living unit of an organism is an organ. False

False- Because the basic living unit of an organism is cell.

(d) Amoeba has an irregular shape. True

Answer 2

Answer:

1) c) One plane only.

2) b) Amoeba

3) b) Aerial animals.

4) b) About three-fourth

5) a) Nitrogen