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The larvae of Echinodermates are (a) Tro...

The larvae of Echinodermates are
(a) Trochophore and Auricularia
(b) Bipinnaria and Brachiolaria
(c) Redia and Carcaria
(d) Miracidium and Cysticerci.

A

Trochophore and Auricularia

B

Bipinnaria and Brachiolaria

C

Redia and Carcaria

D

Miracidium and Cysticerci.

Text Solution

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The correct Answer is:
To solve the question regarding the types of larvae found in Echinodermata, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Question**: The question asks for the types of larvae that are characteristic of Echinodermata. We need to identify which option correctly lists these larval forms. 2. **Review the Options**: - **(a)** Trochophore and Auricularia - **(b)** Bipinnaria and Brachiolaria - **(c)** Redia and Carcaria - **(d)** Miracidium and Cysticerci 3. **Identify Echinoderm Larvae**: - Echinoderms, such as starfish and sea urchins, have specific larval forms. The two primary larval forms are **Bipinnaria** and **Brachiolaria**. - **Bipinnaria** is the first larval stage that swims in the seawater for a few weeks. - **Brachiolaria** is the subsequent larval stage that develops from Bipinnaria. 4. **Evaluate Each Option**: - **Option (a)**: Trochophore and Auricularia - These are not associated with Echinoderms; they are related to other groups like mollusks and annelids. - **Option (b)**: Bipinnaria and Brachiolaria - These are indeed the correct larval forms of Echinoderms. - **Option (c)**: Redia and Carcaria - These are larval forms associated with parasitic flatworms, not Echinoderms. - **Option (d)**: Miracidium and Cysticerci - These are larval forms associated with certain parasites, not Echinoderms. 5. **Conclusion**: Based on the evaluation, the correct answer is **(b) Bipinnaria and Brachiolaria**. ### Final Answer: The larvae of Echinodermates are **(b) Bipinnaria and Brachiolaria**.
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