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1.Sexual Reproduction in Flowering Plants
medium
What does the filiform apparatus do at the entrance into ovule?
A
It brings about opening of the pollen tube.
B
It guides pollen tube from a synergid to egg.
C
It helps in the entry of pollen tube into a synergid.
D
It prevents entry of more than one pollen tube into the embryo sac.
(AIPMT-2008)
Solution
(b) : Within the embryo sac three cells are grouped together at the micropylar end and constitute the egg apparatus. The egg apparatus, in turn, consists of two synergids and one egg cell. The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which plays an important role in guiding the pollen tubes into the synergid. Three cells are at the chalazal end and are called the antipodals. The large central cell, has two polar nuclei.
Standard 12
Biology
