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explain the meaning of line..

since reproductive processes such as pollination and fertilization are independent of water seed formation is more dependable..


The above statement suggests Angiosperms are highly benefitted due to their reproduction by the method of seed formation. Seeds have better adaptive strategies for dispersal to new area, seed have sufficient food reserves, seed possess hard protective coating which provides protection to the developing embryo.

Bryophyte and pteridophyte succession is limited as they are dependent on water for the transfer of their gametes.
 

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The above sentence conveys that angiosperms are benefited by it's unique character of formation of seeds.

It is to be noted that Bryophytes and Pteridophytes succession is limited because the their gametes are being released in water. Hence their progeny are limited to ecological area where there is water resource.

In Angiosperms pollination and fertilization need not depend (with some exceptions), seed has an embryo which has the potential to give rise to new plant. The seeds through various biotic and abiotic factors (rather than water) get dispersed to various ecological area. Hence seed formation is more dependable.

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