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

Pollen grains germinate on the stigma of a flower. The stigma is a part of the pistil, which is the female reproductive organ of the flower. The pollen tube grows from the pollen grain on the stigma to the ovule, where fertilization occurs.

The source of food for the developing embryo in angiosperms (flowering plants) is the endosperm. The endosperm is a tissue produced inside the seeds of most flowering plants following fertilization. It provides the necessary nutrients to the developing embryo.

The larger cell of a pollen grain with an irregularly shaped nucleus is the vegetative cell. The vegetative cell plays a crucial role in the growth of the pollen tube, which is essential for the fertilization process in plants.

The suspensor is a structure in plant embryos that pushes the developing embryo towards the endosperm to facilitate nutrient transfer. It acts as a conduit, providing the necessary support and nutrition to the growing embryo.

The development of the male gametophyte begins before pollination. It starts with the formation of the pollen grain in the anthers. The pollen grain undergoes mitotic division to form two cells – a larger vegetative cell and a smaller generative cell, which further divides to form two sperm cells. This entire process takes place before pollination.

Male gametes in plants are produced by the generative cell of the pollen grain through mitosis. These gametes are haploid, meaning they contain a single set of chromosomes. This ensures that after fertilization, the zygote will have the correct diploid number of chromosomes.

The tapetum is the innermost layer of the anther and provides nourishment to the developing pollen grains. It plays a crucial role in the development of viable pollen by supplying essential nutrients and enzymes.

The hypophysis is a group of cells in the developing embryo that gives rise to the root cap and the apical meristem of the radicle, which is the embryonic root. Thus, the radicle tip is derived from the hypophysis.