NEET2008BotanySexual Reproduction in Flowering PlantsActual
What does the filiform apparatus do at entrance into ovule?
Options
- AIt helps in the entry of pollen tube into synergid
- BIt prevents entry of more than one poll tube into the embryo sac
- CIt brings about opening of the pollen tut
- DIt guides pollen tube from a synergid to e
Correct answer
A. It helps in the entry of pollen tube into synergid
Step-by-step solution
In most cases the mature embryo 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 micropylar end. Filiform apparatus is formed due to invaginations of cell wall into the protoplasm and is made up of pectocellulosic fibres evolved in non-cellulo