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1. Double fertilisation is an event unique to angiosperms and gymnosperms. 2. The zygote develops into an embryo 3. Primary endosperm nucleus (PEN) develops into endosperm which provides nourishment to the developing embryo. 4. The synergids and antipodals degenerate after fertilisation. 5. During these events the ovules develop into seeds and the ovaries develop into fruit. Regarding 1,2,3,4 and 5:

( a ) 3 is incorrect but 1,2,4 and 5 are correct
( b ) 2 is incorrect but 1,3,4 and 5 are correct
( c ) 1 is incorrect but 2,3,4 and 5 are correct
( d ) 4 is incorrect but 1,2,3 and 5 are correct
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(C) is the right answer.

flower (of angiosperm) : One male gametes fuses with the egg cell to form a zygote (syngamy); other male gamete fuses with the diploid secondary nucleus to produce the triploid primary endosperm nucleus (PEN). Because of the involvement of two fusions, this event is termed as double fertilisation,an event unique to angiosperms. The zygote develops into an embryo (with one or two cotyledons) and the PEN develops into endosperm which provides nourishment to the developing embryo. The synergids and antipodals degenerate after fertilisation. During these events the ovules develop into seeds and the ovaries develop into fruit.
answered Mar 20, 2014 by pady_1
 

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