Q.Draw a labelled diagram of the L.S. of anatropous ovule and list the components of embryo sac and mention their fate after fertilization.

The anatropous ovule's L.S. shows the funicle, hilum, chalaza, integuments, micropyle, and embedded embryo sac; after fertilization, the egg becomes the zygote/embryo, the secondary nucleus becomes the endosperm, and the synergids and antipodals degenerate. …

This question has two parts. For the labelled diagram itself, draw and label your anatropous ovule strictly from your own textbook's printed figure (this platform's own-drawn art is a checked reference for study, not a substitute for practicing the exact figure your exam expects you to reproduce by hand). A correctly labelled anatropous ovule shows: the funicle (stalk) attaching the ovule to the placenta; the hilum, where the funicle meets the ovule body; the chalaza at the base, opposite the micropyle; the outer and inner integuments surrounding the central nucellus; the micropyle, the narrow apical opening lying close to the funicle (because the ovule is inverted in the anatropous type); and, embedded within the nucellus, the embryo sac.

Components of the embryo sac and their post-fertilization fate:

• Egg cell (haploid, at the micropylar end): fuses with a male gamete in syngamy to become the diploid zygote, which develops into the embryo.
• Two synergids (haploid, flanking the egg, bearing the filiform apparatus): one receives the pollen tube discharge; both synergids degenerate after fertilization.
• Two polar nuclei / secondary (definitive) nucleus (formed by fusion of the two polar nuclei): undergoes triple fusion with the second male gamete to form the triploid primary endosperm nucleus, which develops into the nutritive endosperm.
• Three antipodal cells (haploid, at the chalazal end): play a nutritive/supportive role during development and degenerate after fertilization. …

List each embryo-sac component and separately state its specific fa …

• Forgetting that synergids and antipodals both simply degenerate; only the egg and the secondary nucleus go on to form new post-fertilization structures. …