InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
Which one of following is a correct statement?A. Pteridophyte gametophyte has a protonemal and leafy stageB. In gymnosperms female gametophyte is free-livingC. Antheridiophores and archegoniophores are present in pteridophytesD. Origin of seed habit can be traced in pteridophytes |
|
Answer» Correct Answer - D (d) Origin of seed habitat can be traced in pteridophytes. Some pteridophytes like Selaginella and Salvinia are heterosporous as they produce teo kinds of spores micro (small) spores and macro (large) spores, which germinate and give rise to male and female gametophyte respectively. The female gametophyte in these plants are retained on the parent sporophytes for variable periods. The development of the zygote into young embryos takes place within the female gametophyte. This event is the precursor to the seed habit and considered to an important step in evolution. |
|