Question

Name the two groups of animals which have been classified on the basis of origin of mouth.

Answer 1

Protostomes and Deuterostomes are the two groups of animals that have been classified on the basis of the origin of the mouth.

Protostomes:

1. Protostomes are created when the blastopores change into the mouth and another cavity becomes the anus.
2. Ventral and solid nerve cords make up the nervous system.
3. By digging into the embryo, the digestive tract creates the anus.
4. Simpler and lower organisms like annelids, flatworms, arthropods, bees, etc., are included in protostomes.

Deuterostomes:

1. During embryonic development in deuterostomes, the blastopores changed into the anus.
2. The nerve fibers in the nervous system are revered.
3. By tunneling into the embryo, the digestive tract creates the mouth.
4. Deuterostomes include sophisticated and higher organisms like humans, monkeys, etc.