Match and choose the correct pair `{:((a),"Cephalopoda "-,"Closed circulatory "-, "Pinctada"),((b),"Echinoidea "-, "Aristotle's lantern "-,"Sea Urchin"),((c),"Tentaculat "-,"Cnodolasts "-,"Pleurobrachia"),((d),"Hexactinellida "-,"Siliceous spicules "-,"Venus flower basket"-):}`

Options

A. (b), (d)
B. (a), (d)
C. (c), (d)
D. (a), (c)

Answer

To solve the question, we need to match the given pairs correctly based on the characteristics of the respective classes and examples provided. Let's analyze each option step by step.

### Step-by-Step Solution:

1. **Option (a): "Cephalopoda" - "Closed circulatory" - "Pinctada"**
- **Analysis**: Cephalopoda, which includes squids and octopuses, indeed has a closed circulatory system. However, Pinctada is not a cephalopod; it belongs to the class Bivalvia (specifically, it is known as the pearl oyster).
- **Conclusion**: This pair is incorrect.

2. **Option (b): "Echinoidea" - "Aristotle's lantern" - "Sea Urchin"**
- **Analysis**: Echinoidea refers to sea urchins, which do possess an Aristotle's lantern, a structure used for scraping food off surfaces. This is a correct match.
- **Conclusion**: This pair is correct.

3. **Option (c): "Tentaculat" - "Cnodolasts" - "Pleurobrachia"**
- **Analysis**: Tentaculat refers to a group of organisms that have tentacles, and Pleurobrachia is a genus of ctenophores (comb jellies). However, "Cnodolasts" is a feature of the phylum Cnidaria, not related to Pleurobrachia.
- **Conclusion**: This pair is incorrect.

4. **Option (d): "Hexactinellida" - "Siliceous spicules" - "Venus flower basket"**
- **Analysis**: Hexactinellida is a class of sponges known for having siliceous spicules. The Venus flower basket is indeed a well-known example of this class.
- **Conclusion**: This pair is correct.

### Final Conclusion:
The correct pairs are:
- **(b)**: "Echinoidea" - "Aristotle's lantern" - "Sea Urchin" (Correct)
- **(d)**: "Hexactinellida" - "Siliceous spicules" - "Venus flower basket" (Correct)

Thus, the correct answers are **B and D**.