Question

An animal which has both exoskeletal and endoskeletal structures is
A) Freshwater mussel
B) Tortoise
C) Frog
D) Jellyfish

Answer 1

Hint: Exoskeleton is the outer skeleton that protects the animal’s body. Exoskeleton contains rigid components that help in protection, excretion etc. An endoskeleton is an internal support structure of an animal which contains mineralized tissue.


Complete answer:
Frogs have endoskeleton which is a hard structure like bones and protects an organism internally. Frogs belong to amphibians (cold blooded animals) and have delicate skin. Jellyfish are invertebrates which is a form of endoskeleton also known as hydrostatic skeleton. In jellyfish the advantage of endoskeleton is that as living tissue endoskeleton grows in tandem with the rest of the body.
Advantages of exoskeletal structure-
>Gives support against any abrasion.
>Helps in complex movements due to appendages.
>Exoskeletal structure provides protection against the animal's organ as well as muscles from getting injured.
>Arthropods, which include insects, cockroaches, spiders, snails, crabs, ants, bees etc. all are the animals with exoskeleton.
Advantages of endoskeletal structure
>As endoskeleton holds the inner components, it provides structural support to the body.
>Helps in storing minerals and lipids, supports organs and helps in movement.
>Endoskeletons are human beings, dolphins, whales, fish and birds.

Hence the correct answer is option ‘B’ i.e, Tortoise.

Note:The skeleton of Tortoise is made up of two parts-
>Exoskeleton which consists of carapace and plastron.
>Endoskeleton consists of appendicular and axial skeleton.