The exoskeleton of insects consists of chitinous cuticle. It gets hardened due to deposition of calcium. It prevents dessication and gives protection.

Correct Option: B

The exoskeleton of insects consists of chitinous cuticle. It gets hardened due to deposition of calcium. It prevents dessication and gives protection.

Metagenesis is defined as alternation of generation found in phylum cnidaria (eg. Obelia). In this phenomenon one generation of an organism reproduces asexually, followed by a sexually reproducing generation.

Correct Option: A

Metagenesis is defined as alternation of generation found in phylum cnidaria (eg. Obelia). In this phenomenon one generation of an organism reproduces asexually, followed by a sexually reproducing generation.

In nature insects have the highest number of species (30 million). Fungi have 100,000, angiosperms have 260000 and birds have 10,000 species.

Correct Option: B

In nature insects have the highest number of species (30 million). Fungi have 100,000, angiosperms have 260000 and birds have 10,000 species.

Coelom or body cavity, when derived from blastocoel is pseudocoelom as in nematodes, rotifers. In this type of cavity, mesoderm is lined by only one side i.e., towards the body wall. Schizocoel is true coelom derived from mesodermal segments.

Correct Option: B

Coelom or body cavity, when derived from blastocoel is pseudocoelom as in nematodes, rotifers. In this type of cavity, mesoderm is lined by only one side i.e., towards the body wall. Schizocoel is true coelom derived from mesodermal segments.

In radial symmetry – body is cut longitudinally through any radius into two equal halves. Present in sessile animals i.e. star fish that live in the sea bottom.

Correct Option: C

In radial symmetry – body is cut longitudinally through any radius into two equal halves. Present in sessile animals i.e. star fish that live in the sea bottom.