Question

cycas microsporophyll describe
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Answer 1

Answer

Cycas is a genus of plants belonging to a very ancient lineage, the Cycadophyta, which are not closely related to palms. ferns, trees or any other modern group of plants. They are evergreen perennials which achieved their maximum diversity in the Jurassic and Cretaceous periods, when they were distributed almost worldwide. At the end of the Cretaceous, when the non-avian dinosaurs became extinct, so did most of the cycas in the Northern Hemisphere.

Answer 2

Answer:

Explanation:

• Cycas is a gymnosperm.The gymnosperms (gymnos : naked, sperma : seeds) are plants in which the ovules are not enclosed by any ovary wall and remain exposed, both before and after fertilisation.
• The gymnosperms are heterosporous; they produce haploid microspores and megaspores.
• The two kinds of spores are produced within sporangia that are borne on sporophylls which are arranged spirally along an axis to form lax or compact strobili or cones.
• The strobili bearing microsporophylls and microsporangia are called microsporangiate or male strobili.
• The microspores develop into a male gametophytic generation which is highly reduced and is confined to only a limited number of cells.
• This reduced gametophyte is called a pollen grain.
• The development of pollen grains take place within the microsporangia.
• The cones bearing megasporophylls with ovules or megasporangia are called macrosporangiate or female strobili.
• The male or female cones or strobili may be borne on the same tree (Pinus).
• However, in cycas male cones and megasporophylls are borne on different trees.