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Ink glands or sacs produce coloured pigm...

Ink glands or sacs produce coloured pigment which is ejected out into the water and form smoke screen for offence and defence. Such specs are found in

A

Sepia

B

Pecten

C

Mytilus

D

Teredo

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The correct Answer is:
To answer the question regarding which organism possesses ink glands or sacs that produce colored pigment for offense and defense, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Ink Glands**: Ink glands are specialized structures found in certain marine animals that produce a dark pigment, primarily melanin. This pigment can be ejected into the water to create a smoke screen, aiding in defense against predators. 2. **Identifying the Organism**: The question specifically asks for an organism that has these ink glands. The most well-known group of animals that possess ink sacs are cephalopods. 3. **Recognizing Cephalopods**: Cephalopods include squids, octopuses, and cuttlefish. Among these, the cuttlefish is particularly noted for its ink production. 4. **Focusing on Cuttlefish**: The scientific name for cuttlefish is "Sepia." This organism is known for its ability to eject ink as a defense mechanism, creating a cloud in the water to confuse predators. 5. **Evaluating Other Options**: The other options provided in the question include: - **Pactin**: A genus of marine bivalve mollusks, which do not have ink glands. - **Mytilis**: Refers to saltwater mussels, also lacking ink production. - **Teredo**: A type of bivalve mollusk that is modified for boring into wood, which does not possess ink sacs. 6. **Conclusion**: Based on the information, the correct answer to the question is **Sepia**, which is the cuttlefish known for its ink-producing capabilities. ### Final Answer: The correct answer is **Sepia** (cuttlefish). ---
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