Question

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

• A. Cycads
• B. Conifers
• C. Polypetalous angiosperms
• D. Gamopetalous angiosperms

Answer 1

Answer: (A)

Cycads

Cycas is a gymnosperm. It belongs to order Cycadals of gymnosperms. The plant body is sporophytic differentiated into root, stem, and leaves. The male gametes of cycas are largest in nature, visible to naked eye, oval in form and top-shaped. Male gamete is spirally coiled in the anterior half with thousands of small cilia. After fertilization, the ovule is converted into a seed. In the endosperm of seed lies a well-developed embryo having two cotyledons, a plumule, and a radicle.

So, the correct answer is option A.