Question:
Double fertilization (or trbsle fusion) leading to initiation of endosperm in angiosperms, requires
Double fertilization (or trbsle fusion) leading to initiation of endosperm in angiosperms, requires
Updated On: Aug 1, 2022
- fusion of four or more polar nuclei and the second male gamete only
- fusion of two polar nuclei and second male gamete only
- fusion of one polar nucleus and second male gamete only
- all the above types of fusion in different types of angiosperms
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The Correct Option is B
Solution and Explanation
Nawaschin $(1898)$ was first to show that both the male gametes released by a pollen tube are involved in fertilization. Nucleus of one gamete fuses with egg nucleus (syngamy). Nucleus of the other gamete fuses with the polar nuclei or their fusion product (secondary nucleus). Most of the plants have two polar nuclei; hence second fertilizaton involves the fusion of three nuclei (triple fusion).
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Concepts Used:
Pollination and Double Fertilization
Pollination is defined as the pre-fertilization event or process, where pollen grains from another are transferred to the stigma of a flower.
Double fertilization is a complex process that involves the fusion of one female gametophyte with two male gametes.
Types of Pollination:
All plants having flowers completely rely on the pollination method for reproduction. There are 2 types of pollination –
- Self Pollination
- Cross-Pollination
The end products of double fertilization are:
- Diploid Zygote
- Primary Endosperm Nucleus