Pollen-Pistil Interaction & Double Fertilisation — NEET Biology
📚 Practice ConceptPollen-pistil interaction involves all events from the landing of pollen grains on the stigma until the pollen tube enters the embryo sac (when the pollen is compatible) or pollen inhibition (when the pollen is incompatible). Following compatible pollination, pollen grain germinates on the stigma and the resulting pollen tube grow through the style, enter the ovules and finally discharges two male gametes in one of the synergids. Angiosperms exhibit double fertilisation because two fusion events occur in each embryo sac, namely syngamy and triple fusion. The products of these fusions are the diploid zygote and the triploid primary endosperm nucleus (in the primary endosperm cell). Zygote develops into the embryo and the primary endosperm cell forms the endosperm tissue. Formation of endosperm always precedes development of the embryo.
Which of the following statements are NOT correct? S1: Double fertilisation, a unique characteristic of angiosperms, involves two distinct fusion events leading to the formation of the embryo and nutritive endosperm. S2: Syngamy results in a triploid Primary Endosperm Nucleus, while triple fusion forms a diploid zygote. S3: The central cell, after triple fusion, contains a triploid Primary Endosperm Nucleus and becomes the Primary Endosperm Cell (PEC), which typically undergoes free-nuclear divisions to form endosperm. S4: In all flowering plants, the pollen tube exclusively enters the ovule through the micropylar end, guided by the filiform apparatus of the egg cell. S5: The nutritive endosperm tissue, which is always completely consumed during embryo development in both albuminous and non-albuminous seeds, precedes embryo development.
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