What does the filiform apparatus do at the entrance into ovule?
Correct answer: C. It helps in the entry of the pollen tube into a synergid
- A. It brings about the opening of the pollen tube
- B. It guides the pollen tube from a synergid to the egg
- C. It helps in the entry of the pollen tube into a synergid
- D. It prevents the entry of more than one pollen tube into the embryo sac
Explanation
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.
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About Kingdom Plantae
Plants are multicellular, photosynthetic eukaryotes with cellulose cell walls, chloroplasts and large vacuoles. Coverage includes alternation of generations, vascular and non-vascular plants, seedless and seed-producing groups, gymnosperms and angiosperms, and the distinction between monocot and dicot features.
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