Question

Which of the following is true or false

1) One of the defining characteristics of the Phylum Crustacea is that they have a swimming veliger larva that has a globular body and two large round ear-like lobes that are ciliated for locomotion and filter feeding.

2) The genus Homo appeared about 2.5 million years ago, Homo sapiens appeared about 150,000-200,000 years ago, and the flowering of human culture occurred about 40,000 years ago.

3) One of the factors that can determine whether or not a coral reef survives or not is the rate of land subsidence.

4) Diversification within the Phylum Platyhelminthes includes one Class that is free living and three classes that are parasitic (either ectoparasitic or endoparasitic).

Answer 1

Ans-

• 1. False

The veliger larva is found mostly in molluscs. The crustacea lacks veliger larva

• 2. False

Homo appeared 2 million years ago. Homo sapiens appeared 300,000 to 200,000 years ago

• 3. True

As coral raised above sea level generally dies. If the land subsidence is slow they still keep pace by growing on the older dead reef.

• 4. True

Platyhelminthes contain four classes Turbellaria, Monogenea, Trematoda and Cestoda. Out of which Turbellaria is free living and rest three are parasite.