Test: Frog - 1 - NEET MCQ

Frogs use their skin for cutaneous respiration when they are in water, absorbing oxygen directly from the dissolved oxygen in the water through their moist skin.

Line in NCERT: "In water, skin acts as aquatic respiratory organ (cutaneous respiration)."

Frogs do not have a tail; they have a head and trunk directly connected, without a distinct neck or tail.

Digestion in frogs primarily occurs in the intestine, where final digestion and absorption of nutrients take place after initial processing in the stomach.

Line in NCERT: "Final digestion takes place in the intestine."

The skin of a frog is smooth and slippery due to the presence of mucus. The skin has a moist characteristic which is maintained. A frog does not drink water but has the ability to absorb water through its skin.

Line in NCERT: "The skin is smooth and slippery due to the presence of mucus."

The body of the frog is divided into a head and a trunk. Neck and tail are absent. Frogs are green with dark irregular spots on the dorsal side. On the ventral side, they are pale yellow in color.

Line in NCERT: "Body of a frog is divisible into head and trunk."

The nictitating membrane protects the eyes of the frog in water. The tympanum is the ear of the frog. Cloaca are excretory organs. Bidder’s canal is a part of the male reproductive system of frogs.

Line in NCERT: "Eyes are bulged and covered by a nictitating membrane that protects them while in water."

The tympanum is the ear of frog. It receives sound signals from the environment. The tympanum is a membranous structure. The received environmental sound signals is then transmitted to the nervous system.

Line in NCERT: "On either side of eyes a membranous tympanum (ear) receives sound signals."

Each forelimb of frog has four digits while each hindlimb of frog has five digits. The hindlimbs are larger and more muscular than the forelimbs. The limbs are used for leaping, swimming and burrowing.

Line in NCERT: "The hind limbs end in five digits and they are larger and muscular than fore limbs that end in four digits."

Frogs are carnivorous and primarily feed on insects, small invertebrates, and occasionally small vertebrates like fish, making them important predators in their ecosystems.

Male frogs can be identified by their vocal sacs, which are used to produce sound during mating calls. This feature is critical for attracting females and establishing territory. Additionally, male frogs typically have a copulatory pad on the first digit of their fore limbs, which aids in grasping females during reproduction. This sexual dimorphism is an interesting adaptation that enhances reproductive success in frogs.

Line in NCERT: "Male frogs can be distinguished by the presence of sound producing vocal sacs and also a copulatory pad on the first digit of the fore limbs which are absent in female frogs."