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Top-shaped multiciliate male gametes, and the mature seed which bears only one embryo with two cotyledons, are characteristic features of

1. Cycads
2. Conifers
3. Polypetalous angiosperms
4. Gamopetalous angiosperms

Correct answer: Cycads

Solution

Cycads are gymnosperms with large, top-shaped multiciliate (motile) male gametes. Their seeds typically contain one embryo with two cotyledons, which fits the description given.

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