KCET · BIOLOGY · STD 11 - 4. Animal Kingdom

An animal which has both exoskeletal endoskeletal structure is

A frog
B jelly fish
C fresh water mussel
D tortoise

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Answer & Solution

Correct Answer

(D) tortoise

Step-by-step Solution

Detailed explanation

(D) tortoise,
Tortoises possess an exoskeletal shell made of bony plates covered by keratin and an endoskeleton comprising a backbone and internal bones. This dual skeletal system provides protection and structural support, distinguishing tortoises from frogs (endoskeleton only), jellyfish (lacks both exoskeleton and endoskeleton), and freshwater mussels (exoskeleton only).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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