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In Amphioxus, blood circulatory system i...

In Amphioxus, blood circulatory system is :–

A

Closed

B

Without heart

C

Without respiratory pigment

D

All of above

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The correct Answer is:
To answer the question regarding the blood circulatory system in Amphioxus, we can break down the information step by step: ### Step-by-Step Solution: 1. **Understanding Amphioxus**: Amphioxus, also known as lancelets, are small, fish-like marine animals that belong to the subphylum Cephalochordata. They are significant in studying the evolutionary aspects of vertebrates. 2. **Type of Circulatory System**: The circulatory system in Amphioxus is classified as a **closed circulatory system**. This means that the blood circulates within blood vessels and does not flow freely in the body cavity. 3. **Absence of Heart**: Unlike many other organisms, Amphioxus does not possess a heart. Instead, the blood is moved through the vessels by the contraction of the vessel walls. 4. **Lack of Respiratory Pigments**: Amphioxus does not have respiratory pigments like hemoglobin in their blood. This means that oxygen is not transported in the same way as in organisms with hemoglobin. 5. **Conclusion**: Based on the above points, we can conclude that the blood circulatory system in Amphioxus is closed, without a heart, and lacks respiratory pigments. ### Final Answer: In Amphioxus, the blood circulatory system is closed, without a heart, and without respiratory pigments. ---
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