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

The endothecium is a layer of cells found in the anther of a plant. It plays a crucial role in the dehiscence of the anther, which is the process where the anther releases pollen. The endothecium cells have thickened walls that help in the splitting of the anther when it is mature, facilitating the release of pollen grains.

Sporopollenin is known to be one of the most resistant natural organic materials. It is a major component of the outer wall of spores and pollen grains. Its resistance to chemical and biological degradation makes it extremely durable, ensuring the protection of the genetic material within the spores and pollen.

The nucellus is a mass of parenchymatous tissue found in the ovule of seed plants. It provides nourishment to the developing embryo sac and is a key tissue in the reproductive structure of the plant.

A typical anther is bilobed, meaning it has two lobes. Each lobe typically contains two microsporangia, making a total of four microsporangia in a typical anther. Therefore, the correct answer is 'Two lobe Four sporangia'.

During the development of a monosporic embryo sac, the nucleus of the functional megaspore undergoes three mitotic divisions to form an 8-nucleate structure. Hence, the correct answer is '3 times'.

Cross pollination leads to genetic recombination, which increases genetic diversity in the offspring. This genetic diversity can provide a better chance of survival and adaptation to changing environments. Therefore, the correct answer is 'Genetic recombination'.

Unisexual flowers have either male or female reproductive organs, but not both. This prevents self-pollination because the flowers cannot fertilize themselves. They rely on cross-pollination from another flower.

The filiform apparatus, found in the synergids of the ovule, guides the pollen tube to ensure that it reaches the egg cell for fertilization.

Coconut water is an example of free-nuclear endosperm. In this type of endosperm, nuclear divisions occur without immediate cell wall formation, resulting in a liquid endosperm.

In maize seeds, the radicle (embryonic root) is protected by a sheath called the coleorhiza. This structure helps in safeguarding the radicle as it emerges during germination. Hence, the correct answer is coleorhiza.