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Silk, honey and lac are

1. Secretory substance of insects.
2. Secretory substance of plants
3. Artificial chemicals.
4. All of the above.

Correct answer: Secretory substance of insects.

Solution

Silk, honey, and lac are all produced by insects: silkworms make silk, honeybees make honey, and lac insects secrete lac. So they are secretory substances of insects.

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