Question

Assertion: In Pleuraobrachia, eight comb like ciliary plates called comb plates are present on the body that help in locomotion.

Reason: Pleurobrachia reproduces sexually and its life cycle includes cydippid larva.

• A. Both assertion and reason are true and reason is the correct
  explanation of assertion
• B. Both assertion and reason are true but reason is not the correct explanation of assertion
• C. Assertion is true but reason is false
• D. Both assertion and reason are false

Answer 1

The correct option is B Both assertion and reason are true but reason is not the correct explanation of assertion

Pleuraobrachia belongs to the phylum ctenophora in which the body bears eight external rows of ciliated comb plates that help in locomotion.
Ctenophores are hermaphroditic and the gonads of both sexes are located in the lining of the meridional canals. Gametes are shed to the sea through numerous tiny gonopores in the comb rows. Fertilization of the gametes is external. Development is direct without metamorphosis but includes a cydippid larval stage which resembles the adult form.