Question

Select the true statement regarding frog (Rana tigrina).

• A. Frog is a homeothermal animal.
• B. Frog drinks about 5 litres H${}_2$O per day.
• C. Poisonous glands are found on the body of frog.
• D. A very long tail is present in posterior part of frog's body.

Answer 1

Answer: (C)

Poisonous glands are found on the body of frog.

A. Frogs are poikilothermal, i.e., cold-blooded animals. So, frogs have to adopt suitable behaviour patterns to regulate their temperature. To warm up, they can move into the sun or onto a warm surface, if they overheat, they can move into the shade or adopt a posture that exposes the minimum area of skin to the air.
B. They do not drink water like we do. They absorb water directly through their skin in an area known as the 'drinking patch' located on their belly and the underside of their thighs.
C. Most toads and some frogs have an aggregation of poison glands called the parotid glands, located on the sides of their heads behind the eyes. These glands secrete mucus and a range of toxins which may be irritating, bitter and that make frogs slippery to hold and distasteful or poisonous and dangerous to its enemies. If the noxious effect is immediate, the predator may cease its action and the frog may escape. If the effect develops more slowly, the predator may learn to avoid that species in future.
D. Frogs have no tail, except in larval stage.

So, the correct answer is option C.