Match the items in Column I with those in Column II:

A. Yeast	(i) Earthwormc
B. Diaphragm	(ii) Gills
C. Skin	(iii) Alcohol
D. Leaves	(iv) Chest cavity
E. Fish	(v) Stomata
F. Frog	(vi) Lungs and skin

Mark ‘T’ if the statement is true and ‘F’ if it is false:

Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction − upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square.

(i) The air tubes of insects

(ii) Skeletal structures surrounding chest cavity

(iii) Muscular floor of chest cavity

(iv) Tiny pores on the surface of leaf

(v) Small openings on the sides of the body of an insect

(vi) The respiratory organs of human beings

(vii) The openings through which we inhale

(viii) An anaerobic organism

(ix) An organism with tracheal system

The mountaineers carry oxygen with them because:

(a) At an altitude of more than 5 km there is no air.

(b) The amount of air available to a person is less than that available on the ground.

(c) The temperature of air is higher than that on the ground.

(d) The pressure of air is higher than that on the ground.