Question

Which among these is not a homeotherm?
A. Aptenodytes
B. Testudo
C. Delphinus
D. Neophron

Answer 1

Hint: The warm-blooded animals that maintain the internal body temperature stable are called homeotherm. It is not necessarily considered as endothermic. The homeothermic animals show behavioral thermoregulation which means maintaining constant body temperature through behavioral mechanisms. For example – reptiles like desert lizards.

Complete answer:
> Option B: The genus that contains the species of tortoises is called Testudo. The mode of reproduction is sexual. They are found in Western Asia, North Africa, and Europe. Most of the Testudo species are wild and mainly from habitat destruction. The tortoise from the Testudo genus is small with average length ranging from 7.0 to 35 cm and weight 0.7 to 7.0 kg. The animals of the Testudo genus are cold-blooded like fishes, invertebrates, reptiles, and amphibians.

> Option A: The genus that contains the species of penguins is called Aptenodytes. Penguins and all birds are warm- blooded. The meaning of the word Aptenodytes is the warm-blooded animals that can dive without wings. They are also known are kings or great penguins. The weight of king penguins is 11 to 16 kg and height 90 cm tall.

> Option C: The genus that contains species of dolphins is called Delphinus. The aquatic mammals like whales, dolphins, seals, etc., are warm-blooded and can maintain a stable temperature of their body. The dolphins are found in the Indian ocean and red sea which has a long thin beak.

> Option D: The genus that contains the species of scavenger vultures is called Neophron.

Hence, the correct answer is option (B).

Note: homeothermic animals are warm-blooded whose body temperature inside the body is stable. They mainly consist of birds, marine mammals, etc. There is always a behavioral change in the warm-blooded animals. They change their behavior according to environmental changes. On the other hand, cold-blooded animals are reptiles, amphibians, etc., mainly show changes in response to habitat.