Human Reproduction. Humans undergo sexual reproduction. This involves two parents: a male and a female. Humans are unisexual organisms. Humans exhibit sexual dimorphism. Humans are viviparous organisms. In humans, a male reproductive system is found in males, and a female reproductive system is found in females. The fusion of male and female gametes forms a…
Post-fertilization Structures and Events. All the events involving the maturation of the ovule into a seed and the development of the ovary into a fruit are collectively referred to as post-fertilization events. Endosperm. The development of the endosperm precedes the development of the embryo. The primary endosperm cell undergoes repeated divisions to form a triploid…
Pollination. The transfer of pollen from the anther to the stigma of the pistil is called pollination. Types of Pollination: 1. Autogamy 2. Homogamy 3. Cross-Fertilization Autogamy – When pollen is transferred to a flower of the same plant, it is called autogamy. This type of pollination occurs in only one flower. For autogamy to…
Structure of the Pistil. The gynoecium represents the female reproductive organ of the flower. The pistil has three parts. Stigma Stylus Ovary The pollen grain reaches the stigma. The style is a tubular part. The lower, swollen part of the pistil is the ovary. The gynoecium may contain one or multiple pistils. 1. Monocarpic -…
Microsporogenesis in Botany. Structure of the Stamen. A typical stamen is a bilocular, divided into two parts. Long and thin filament Anther (bilobed) Structure of the anther. Pollen grains develop in the microsporangium within the anther. The anther has a four-sided (quadrangular) structure, with microsporangia present at each corner. Structure of the Microsporangium. Epidermis -…
Sexual Reproduction in Flowering Plants Flower Structure. Angiosperms are attached to the plant by a pedicel, the basal part of which is called the anther. Parts of a Flower. A flower has four main parts: Sepals Corolla Stamens Gynoecium The sepals and corolla are called the accessory whorl, and the stamens and gynoecium are called…
