Question

The characteristics of Amphibia and Aves respectively are
A. Cold-blooded, warm-blooded
B. Do not have scales or hair on their skin, have feathers
C. Both A and B
D. None of these

Answer 1

Hint: Amphibians do not maintain the body temperature by the inner physiological process. For eg: Frogs
Aves maintain the body temperature by the inner physiological process. For eg: Birds

Complete answer: Amphibians: The metabolic rate of Amphibians is low and as a result, their food and energy requirements are limited.
1. In the adult state of amphibians, they have tear ducts and movable eyelids, and most species have ears that can detect airborne or ground vibrations.
2. Amphibians have muscular tongues, which in many species can be protruded. Modern amphibians have fully ossified vertebrae with articular processes.
3. Their skulls are mostly broad and short and are often incompletely ossified.
4. The hearts of amphibians are three-chambered, two atria, and one ventricle.
5. Amphibians have a urinary bladder and nitrogenous waste products are excreted primarily as urea.
6. Amphibians lay their eggs in water and have aquatic larvae that undergo metamorphosis to become terrestrial adults.

Aves: The body of Aves is divided into- head, long neck, trunk, and short stumpy tail.
1. Endoskeleton is bony. Skull is monoconcyclic.
2. Tail vertebrae are fused to form pygostyle. Bones are pneumatic.
3. The presence of furcula is a unique characteristic of Aves. They have flight muscles known as the pectoralis major and pectoralis minor.
4. Respiration is pulmonary and the heart is 4-chambered.
5. Sense organs include eyes with a comb-like structure known as pecten.
6. Sexes are different from well-organized sexual dimorphism. They are amniotes.

Additional information: Amphibia: Amphibia are cold-blooded animals or poikilothermal. They have smooth moist skin with lots of glands on it. The exoskeleton is absent.
Aves: Aves are warm-blooded animals or homeothermic.
Skin is dry and devoid of glands other than oil or preen glands that are used for dressing and waterproofing of feathers. They have exoskeletons in the form of feathers, scales, claws, and a toothless beak. It is epidermal in origin.

So, the answer is C. Both A and B

Note: Carboniferous period was the ‘age of Amphibians’.
The Jurassic period is the ‘age of Birds’.