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Grade: 12

                        

Which of the following is correct for pteridophytes showing the events which is precursor to the seed habit? A) These are heterosporous B) The female gametophytes in these plants are retained on the parent sporophyte for variable periods C) The development of zygotes into young embryo’s take place within the female gametophytes D) All are correct

4 months ago

Answers : (2)

Arun
24737 Points
							
Genera like Selaginella and Salvinia which produce two kinds of spores, are known as heterosporous. The megaspores and microspores germinate and give rise to female and male gametophytes, respectively.The female gametophytes in these plants are retained on the parent sporophytes for variable periods. The development of the zygotes into young embryos take place within the female gametophytes. This event Is the precursor to the seed habit which is considered as an important step in evolution.
4 months ago
Vikas TU
12119 Points
							
Pollen after being trapped in the distal cavity of the megasporangium produces pollen tube which carry male gametes deep into the embryo sac to fertilize the egg, forming a zygote, that forms an embryo. This event is of significant important and acts as a crucial step for the formation of seed habit
4 months ago
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