Reproduction in OrganismHard
Question
What does the filiform apparatus do at the entrance into ovule ?
Options
A.It helps in the entry of pollen tube into a synergid
B.It prevents entry of more than one pollen tube into the embryo sac
C.It brings about opening of the pollen tube
D.It guides pollen tube from a synergid to egg
Solution
In most cases the mature embriyo sac contains 7-cells and 8-nuclei. THe cells are arranged as egg apparatus (two synergid cell and one egg cell), a central cell with two nuclei and antipodal cells (3 in number). The synergid cells occur laterally to the egg cell. These cells are characterised by finger-like projections called filiform apparatus towards the micropyler end. filiform apparatus is found due to invaginations of cell wall into the protoplasm and is made up of pectocellulosic fibres evolved in non-cellilosic sheath. Secretion of chemotactic substances for the attraction of pollen tube during fertilization is the function of synergids. One synergid becomes degenerate during pollen entry into the embryo sac and thus, peovides a way for entry of pollen tube into the embryo sac.
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