Question

Animals that live in both land and water condition is called as
(a) Terrestrial
(b) Aquatic
(c) Amphibians
(d) All of the above

Answer 1

Hint: Animals that live in both land and water include frogs, toads, Hyla, salamander, etc. These animals are ectothermic and also have accessory respiratory systems. Their larvae mature in water and breathe gills, while adults breathe in air through lungs and skin.

Complete answer:
Amphibian, derived from the Greek word amphibious meaning “living a double life,” reflects the dual life strategy. Amphibians are poikilotherms animals. They are amphibious in nature viz. they leave in both land as well as water. They are mostly found in warm areas and are cold-blooded animals. The skin is smooth or rough having cutaneous glands that keep it moist.
Amphibians start their lives as larvae living in the water. The larval stage of amphibians has gills. The young amphibians undergo metamorphosis from larva with gills to an adult air- breathing form with lungs. Amphibians use their skin as secondary respiratory surfaces. The respiratory organs are lungs, buccopharyngeal cavity, skin, and gills. They return to the water for breeding. The metamorphosis is usually present. A fish- like stage, the tadpole stage is present.
So, the answer is, ‘Amphibians’.

Additional Information: - These have two pairs of limbs for locomotion - The heart is three- chambered, having two auricles and one ventricle. - Both the hepatic portal and renal portal are well developed. - Kidneys are mesonephric. Larva and tailed amphibians are ammonotelic. Frogs and toads are ureotelic.

Note: - Even though evolutionarily amphibians are linked with pieces they lack scales on their body except for Caecilians that have hidden scales beneath their skin. - Some small terrestrial salamanders and frogs lack lungs and rely entirely on their skin. - The gills are present at the larval stage and later replaced by the ling. But some amphibians carry them in addition to the lung. - The urinary bladder is present in the frog.