Question

The urinary bladder is absent in _____.
(A) Chameleon
(B) Snake and crocodile
(C) Snake
(D) Wall lizard

Answer 1

Hint: The animal kingdom is divided into various phyla and then to class depending on the characteristics and features of the organisms.
Reptiles are of the group of animal kingdoms that have different characteristics and within this class also organisms have different body structure and organ function.

Complete answer: Reptiles are the organism that first adapted to life on land, they had evolved from amphibians, they are cold blooded organisms belonging to phylum chordata.
They are creeping terrestrial organism that have scales in their body, they mostly found in warm regions, they do not have glands and have rough skin, the respiration takes place in the lungs, the limbs are pentadactyl have bearing claws, they have three chambered heart while crocodiles have four chambered heart.
Reptiles have organs different from other animals; this includes digestive system that is same as that of vertebrates but for some of the reptiles the salivary gland is evolved to poison gland such as in snakes they are venomous, the excretory system is also same as that of vertebrates but some of the species like snakes and crocodiles do not have urinary gland in the excretory system they converts the waste to insoluble uric acid and these are eliminated through cloaca in such organisms.

Now lets us find the solution from the given options:
1. Chameleon belongs to the lizard family considered as an old world lizard. They have the ability to change the body colour according to the surface they live in. They have a complete excretory system along with a urinary bladder.
2. Next, snakes and crocodiles are reptiles found in both land and terrestrial regions. They lack a urinary bladder as they form a semi-solid waste composed of uric acid they excrete it through cloaca.
3. Snakes are the reptiles found in both land and water. As mentioned above they lack a urinary bladder and excrete via cloaca.
4. Wall lizards are the common lizard that we can observe in our home. They also excreted through cloaca like the snake and crocodiles.

Hence, the correct option is (B). snakes and crocodiles.

Note: The snake and lizards have converse body water and convert their nitrogenous wastes to insoluble uric acid, but for other organisms like alligator excreted their nitrogenous waste as ammonia and they have the urinary bladder.