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Sexual Reproduction In Flowering Plants — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYSexual Reproduction In Flowering Plants2 Marks
Question
Can we store pollen grains artificially? How?###Explain pollen bank.
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Answer

→It is also possible to store pollen grains of a large number of species for years in liquid nitrogen (-196°C).
→Such stored pollen can be used as pollen banks, similar to seed banks, in crop breeding programmes.

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Match Column I with Column II.
S. No.
Column I
S. No.
Column II
A.
Cleavage
1.
Outer layer of the blastocyst that attaches to the endometrium during implantation.
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2.
Mitotic divisions of the zygote in quick succession.
C.
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3.
Embedding of the blastocyst in the endometrium of uterus.
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Release of secondary oocyte from the ovary.
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