Biology Lecture Notes: Pollen and Sexual Reproduction

Vocabulary-based flashcards derived from biology lecture notes covering pollen structures, reproductive stages, and preservation methods.

Tapetum

The specific tissue that nourishes the pollen mother cells.

Parthenium

A specific example of a plant that is known to cause pollen allergy.

Sexual Reproduction Events

The three main events in sexual reproduction are pre-fertilization, fertilization, and post-fertilization.

Mature Pollen Grain Cells

The two cells found in a mature pollen grain: the vegetative cell and the generative cell.

Exine

The outer layer of a pollen grain, which is composed of a highly resistant chemical called sporopollenin.

Intine

The inner layer of a pollen grain, consisting primarily of cellulose and pectin.

Sporopollenin

An organic resistant material present in the exine of pollen grains.

Pollen Preservation

The process of storing pollen grains in liquid nitrogen at $-196^{\text{ o}}C$ for use in pollen banks and crop breeding programs.

Pollen Viability (Rice and Wheat)

In certain cereals like rice and wheat, pollen grains lose their viability within $30\text{ minutes}$ of their release.