Question

Consider the following statements.

(A) In the animals of phylum Porifera, called sponges, the reproduction is only asexual by budding.
(B) Many forms of Coelenterata possess a hard exoskeleton of lime to form corals.
(C) In the animals of phylum Echinodermata, the body surface is covered all over by calcareous spines.
Which of the above statement(s) is/are incorrect?

• A. Only A
• B. Only B
• C. A and B
• D. A, B and C

Answer 1

The correct option is A Only A

Sponges can reproduce sexually as well as asexually. After fertilization in the case of sexual reproduction in the sponge, the larva is released into the water. It floats for a few days. The larvae later sticks to a solid to begin its growth into an adult sponge. Sponges are also able to reproduce asexually through budding.
Coelenterates possess a hard external skeleton of calcium carbonate to form corals.
The skeleton of echinoderms consists of multitudes of small calcareous plates called ossicles.

Thus, the correct answer is option A.