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

Because of the importance of apomixis in hybrid seed industry, active

research is going on in many laboratories around the world to understand

the genetics of apomixis and to transfer apomictic genes into hybrid

Varieties.

(page-39)

Autogamy: Pollination within the same flower

Geitonogamy: Pollination within different flowers of the same plant.

Papaya is dioecious as male and female flowers are borne on different

plants, the type of pollination it will undergo is xenogamy or

cross-pollination.

Megasporangium is commonly called as ovule, arise from placenta inside ovary.

(page-25)

After entering one of the synergids, the pollen tube releases the two male gametes into the cytoplasm of the synergid. One of the male gametes moves towards the egg cell and fuses with its nucleus thus resulting in the formation of a diploid cell, the zygote. The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid primary endosperm nucleus (PEN).

(page-34)

The context mentions 'an amazing range of adaptations to ensure formation of the end products of sexual reproduction, the fruits and seeds.' Post-fertilization events specifically involve the development of the zygote into an embryo (embryogenesis), the primary endosperm nucleus into endosperm, and the ovule into a seed, all contributing to fruit and seed formation.

While not explicitly stated in the provided text, the NCERT context leads to the understanding that sexual reproduction in flowering plants culminates in fruits and seeds. The ovule, after fertilization, develops into the seed. This is a fundamental concept in plant reproduction.

Pollen grains are male gametophytes, formed before fertilization. The embryo, endosperm, and seed are all products of successful fertilization and subsequent developmental changes.

The zygote's dormancy (or lack thereof) is directly related to its subsequent development into an embryo. Therefore, this question points towards the process of embryo development as a significant post-fertilization event.

The text states: 'an amazing range of adaptations to ensure formation of the end products of sexual reproduction, the fruits and seeds.' This clearly identifies fruits and seeds as the ultimate products.

The table of contents clearly lists '1.4 Post-fertilisation: Structures and Events' as the relevant section.