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Mature archegonium of Fern attractes ant...

Mature archegonium of Fern attractes antherozoids chemotactically by means of

A

Soluble proteins

B

Sugars

C

Malic acid

D

Citric acid.

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### Step-by-Step Solution: 1. **Understanding the Question**: The question asks about the chemical substance that allows the mature archegonium of ferns to attract antherozoids (male gametes) through chemotaxis. 2. **Identifying the Options**: The options provided include: - Soluble protein - Sugars - Citric acid - Mellic acid 3. **Evaluating Each Option**: - **Soluble Protein**: This option is incorrect as it does not play a role in the attraction of antherozoids. - **Sugars**: This option is also incorrect; while sugars can have various roles in plant physiology, they are not the attractants for antherozoids in ferns. - **Citric Acid**: This is not the correct answer either, as it does not function as a chemoattractant in this context. 4. **Identifying the Correct Answer**: The correct answer is **Mellic Acid**. The mature archegonium releases mellic acid into the surrounding environment. 5. **Mechanism of Attraction**: Mellic acid acts as a chemical attractant for antherozoids. The concentration of mellic acid is higher near the archegonium and decreases with distance. This gradient of concentration guides the antherozoids toward the archegonium. 6. **Conclusion**: Therefore, the mature archegonium of ferns attracts antherozoids chemotactically by means of mellic acid.
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