Study the following statements w.r.t. frog.

a) Corpora quadrigemina forms midbrain.

b) Receptors of touch, smell and taste are the cellular aggregations around the nerve endings.

c) Ears help in hearing and balancing.

d) Eye lids are absent.

Which of the above are incorrect?

The midbrain in frogs is characterised by a pair of optic lobes (corpora bigemina).

Frogs have eyelids which helps them to keep their eyes moist and clean. They have immovable lower lids and movable upper lids. They also possess a third eyelid called nictitating membrane.