Question

Question 20
Match the names of organisms in Column I with their organs of breathing given in Column II.

Answer 1

(a). Butterfly (iii). Spiracles

1. Respiration in insects such as cockroaches, houseflies, butterflies, etc., occurs through a tracheal system.
2. The tracheal system connects with the external environment through tiny pores on the insect’s abdomen and thorax called spiracles.
3. A pair of spiracles are present on each body segment.
4. The air enters the spiracles connected to the tracheal chamber, which branch out into tracheoles that deliver the oxygen directly to every part of the body.
5. The expansion and contraction of the abdomen allow the gaseous exchange of oxygen and carbon dioxide.

(b). Earthworm (iv). Skin

1. The skin of the earthworms feels moist.
2. That is why they are called slimy creatures.
3. The reason behind their moist skin is that earthworm’s breathing organ is their skin.
4. Air can easily pass through the skin of an earthworm.
5. The exchange of gases usually takes place through its moist skin and capillaries.
6. In these regions the oxygen gas is picked up by the haemoglobin dissolved in the blood and carbon dioxide is released out.

(c). Sparrow (i). Lungs

1. The respiratory organ of birds is a pair of lungs.
2. Air sacs are also connected to the lungs and supplement respiration.

(d). Fish (ii). Gills

1. Gills are projections present on the skin of an organism which lives underwater.
2. It is richly supplied with blood vessels which help in the exchange of gasses.

Final answer:

Column I	Column II
(a). Butterfly	(iii). Spiracles
(b). Earthworm	(iv). Skin
(c). Sparrow	(i). Lungs
(d). Fish	(ii). Gills