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12th CBSE
IMPORTANT
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Ploidy of nucellus, endosperm, polar nuclei, megaspore mother cell and female gametophyte is respectively 

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Important Questions on Sexual Reproduction in Flowering Plants

MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 2 - Sexual Reproduction in Flowering Plants>TEST QUESTIONS>Q (21)
Which of the following has proved helpful in preserving pollen as fossils?