Question

1. Determine the correct pair

a.Rohu fish - Accessory respiratory organ

b. Mosquito - body surface

c. House lizard - Lungs

d.Amoeba - trachea​

Answer 1

The correct pair is- c. House lizard- Lungs.

• In rohu fish, four pairs of gills are present that act as the respiratory organ. The gills help in taking dissolved oxygen (present in water) inside the fish body.
• In mosquitoes, the trachea acts as a respiratory organ. Instead of nostrils, spiracles are present through which oxygen enters their body.
• In house lizards, lungs act as the only respiratory organ. As the body of lizards is covered by scales, the diffusion of gases cannot occur through their skin.
• In amoeba, the cell membrane acts as the respiratory organ. Exchange of gases takes place through simple diffusion between the cell membrane and environment.

Answer 2

a. Rohu fish - Accessory respiratory organ

b. Mosquito - trachea

c. House lizard - Lungs

d. Amoeba - body surface ​

Explanation:

• The fish breathe through the gills. Most of the fish species usually have 4-7 pairs of gills. Oxygen and carbon dioxide are soluble in water whereas most of the fish exchange dissolved oxygen and carbon dioxide through the gills in the water.
• Mosquito pupae have evolved to adapt to aquatic life by breathing with oxygen. As an aquatic insect, the mosquito pupa systemic respiratory has limited access to atmospheric oxygen. All reptiles breathe from the lungs.
• Lizards do not have a diaphragm. Instead, the chest muscles move the chest wall, causing the lungs to inflate and contract.
• Amoeba respiration is caused by simple diffusion, in which oxygen gas dissolved in water or the environment diffuses into the cell through the cell wall.