Learn about the comparison between Male Gametophytes of Cycas and Male Gametophytes of Pinus. Comparison # Male Gametophyte of Cycas: 1. Microspores, which develop into male gametophytes, are un-winged in Cycas. 2. Only one prothallial cell is present in cycas. 3. In cycas the lone prothallial cell persists almost till the end of the male gametophyte development. 4. Pollination takes [...]
Learn about the comparison of Female Gametophytes of Cycas and Female Gametophyte of Pinus. Comparison # Female Gametophyte of Cycas: 1. Cycas is formed by the free-nuclear divisions of megaspore. Wall formation starts after the formation of about 1000 nuclei. 2. A very long resting period is not required in cycas between the free-nuclear stage and start of wall formation. [...]
Essay on Gymnosperms! The word 'gymnosperm' was used in 300 B.C., by Theophrastus in his book 'Enquiry into Plants'. He used this term to include all those plants where seeds are unprotected, (Gymnos = naked; sperma = seeds). The seed plants (spermatophyta) are grouped into two major groups on the basis of protection afforded to the ovule before and after [...]