Botany and Plant Science

A flower is defined as a modified shoot that serves as the reproductive structure of angiosperms, containing the organs necessary for sexual reproduction.

In most angiosperms, pollen grains are shed at the 2-celled stage, consisting of a vegetative cell and a generative cell.

The female parent is tetraploid (4n), so the polar nuclei are 2n each. The male parent is diploid (2n), so the male gamete is n. Fusion of 2n + 2n + n results in a 5n (pentaploid) endosperm.

The filiform apparatus consists of finger-like projections in the synergid cells of the embryo sac, which help guide the pollen tube toward the egg.

Apogamy is the development of an embryo from cells of the gametophyte other than the egg, such as the synergids or antipodal cells, without fertilization.

In Agave, the floral buds often develop into bulbils, which are small plantlets that can detach and grow into new plants, a form of vegetative reproduction.

In the development of the anther wall, the primary parietal cells undergo periclinal divisions to form the endothecium, middle layers, and the tapetum. The middle layers are typically 1 to 3 layers thick, but the standard textbook description for the total wall layers is often cited as 3 layers (endothecium, middle layers, and tapetum).

Geitonogamy is the transfer of pollen grains from the anther to the stigma of another flower on the same plant. While it is functionally cross-pollination, it is genetically similar to self-pollination (autogamy) because the pollen comes from the same individual.

Claw and limb differentiation is found in petals.

Rosaceous corolla consists of five or more petals. 

Jasmine flower has rotate corolla.

The corolla of mustard is of cruciform type.

The outermost largest petal is known as vexillium.

Papilionaceous is a polypetalous and monosymmetrical corolla.

Campanulate corolla has bell-shaped structure.