Question

Crab and prawn belongs to a class
A. Insects
B. Diplopoda
C. Crustacea
D. Arachnida

Answer 1

Hint: Insecta, Diplopoda, Crustacea and Arachnids belong to the phylum Arthropoda, which is the largest phylum of Kingdom Animalia. Organisms that belong to the class crustacean have a chitinous exoskeleton and much-modified appendages. They feed on algae, planktons, etc.

Complete step by step answer:
A. Insects: Insects have three pairs of jointed legs. They have uniramous limbs. Example, ants, bees, wasps, etc.
B. Diplopoda: They have two pairs of jointed legs and have uniramous limbs. They are also known as millipedes.
C. Crustacea: Organisms that belong to this class have five pairs of jointed legs. They have biramous limbs. Example: crabs, prawns, etc.
D. Arachnida: They have eight pairs of jointed legs and have uniramous limbs. Examples: spiders, daddy longlegs, etc.
Hence, the correct answer is option C.

Additional information: Some of the features of Arthropoda are as follows:
i. They have a chitinous exoskeleton.
ii. They undergo the moulting process.
iii. Their legs have jointed appendages.
iv. They have a segmented body.
v. They are oviparous in nature.
vi. Usually all organisms of the phylum Arthropoda have larva stages.

Note: Biramous limbs are limbs that have two parts. It is a type of limb in which it is divided into two branched segmented limbs, whereas uniramous limbs are single-segmented limbs. Organisms belonging to the phylum Arthropoda have highly developed sense organs. The phylum Arthropoda is the largest phylum followed by the Molluscs.