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In flower (of angiosperm) : 1. Each of the cells of an embryo-sac is haploid. 2. Each embryo-sac has a three-celled egg apparatus – one egg cell and two synergids, two antipodal cells and three polar nuclei. 3. The two synergids fuse to produce a diploid secondary nucleus. Regarding 1,2 and 3:

( a ) 1 is correct but 2 and 3 are incorrect
( b ) 2 is incorrect but 1 and 3 are correct
( c ) 1 is incorrect but 2 and 3 are correct
( d ) 3 is incorrect but 1 and 2 are correct

1 Answer

(A) is the right answer.

flower (of angiosperm) : The female *** organ in a flower is the pistil. Pistil consists of an ovary enclosing one to many ovules. Within ovules are present highly reduced female gametophytes termed embryo- sacs. The embryo-sac formation is preceded by meiosis. Hence, each of the cells of an embryo-sac is haploid. Each embryo-sac has a three-celled egg apparatus – one egg cell and two synergids, three antipodal cells and two polar nuclei. The polar nuclei eventually fuse to produce a diploid secondary nucleus.
answered Mar 20, 2014 by pady_1
 

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