Assertion : In angiosperms, endosperm development precedes embryo development.\ Reason : Double fer

Question

Assertion : In angiosperms, endosperm development precedes embryo development.\ Reason : Double fertilisation ensures that the nutritive tissue is formed before the zygote starts cleaving.\

Professor PC Thomas Classes · Answer

(a) : During double fertilisation in angiosperms, one male gamete fuses with the egg to form the diploid zygote (syngamy or generative fertilisation). The diploid zygote finally develops into embryo. The other male gamete fuses with the two polar nuclei (or secondary nucleus) to form the triploid primary endosperm nucleus, PEN (triple fusion or vegetative fertilisation). Double fertilisation ensures that the nutritive tissue is formed before the zygote starts cleaving, providing the nutrients to growing embryo. This adaptation supports seed development and increases the chances of seedling survival.