Sexual Reproduction in Flowering Plants MCQs for NEET — Botany Questions with Answers

a typical angiosperm embryo sac at maturity is 7 celled 8 nucleated

FACTUAL

Although seeds, in general are the products of fertilisation, a few flowering
plants such as some species of Asteraceae and grasses, have evolved a
special mechanism, to produce seeds without fertilisation, called apomixis

In plants, the embryo develops from the zygote. The zygote is formed after the fertilization of the egg cell by a sperm cell. The zygote then undergoes multiple cell divisions and differentiation to form the embryo.

The embryo of a flowering plant is always diploid (2n). This is because it develops from the zygote, which is formed by the fusion of a haploid (n) sperm cell with a haploid (n) egg cell, resulting in a diploid (2n) cell.

The stamen is a modification of the microsporophyll. The microsporophyll is a leaf-like structure that bears microsporangia, where microspores are produced. In the context of flowering plants, the stamen is the male reproductive part that produces pollen, which contains the male gametes.

A microspore is the first cell of the male gametophyte. In the life cycle of plants, the microspore undergoes mitotic division to form the male gametophyte, which will eventually produce the male gametes (sperm cells).

An anther typically consists of four microsporangia. Each microsporangium is a site where pollen (containing microspores) is produced. These microsporangia are grouped in pairs in the anther, making a total of four.

The nucellus is the central part of an ovule in seed plants. The cells of the nucellus are diploid (2n) because they are part of the sporophytic tissue. This means they carry a full set of chromosomes, one from each parent.