Question

Which of the following is correct?

• A. Ornithorhynchus lays eggs
• B. Rat has cloaca
• C. Camel has biconcave RBCs
• D. Bat has feathers

Answer 1

The correct option is A

Ornithorhynchus lays eggs

Ornithorhynchus (platypus) is an egg-laying mammal. Cloaca is a common chamber into which the alimentary, reproductive and urinary tracts open, in amphibians and some reptiles. Rat is however, a mammal, and does not possess a cloaca. Amphibian skin is smooth and moist and is devoid of scales. Feathers are typical of birds. Bat is a mammal, and is devoid of feathers on its body.