Class 9th ICSE

Fertilisation and Post – Fertilisation Events * Syngamy or first fertilisation involves the fusion of one male gamete with the egg cell present in the egg apparatus that result in the formation of a diploid zygote. * Triple fusion involves the fusion of the other male gamete with the polar nuclei in the embryo sac ... Read more

Pollination and Major Agent * Pollination is a process through which pollen shed from the anther is transferred to the stigma of the pistil. * When pollination takes place within the same flower or between flowers of the same plant, it is known as self – pollination. * In autogamy, pollen is transferred from the ... Read more

Flowers * A flower is the sexual reproductive unit of flowering or angiosperms. * A flower ha four main whorls: Calyx, corolla, androecium and gynoecium, arranged on the thalamus or the receptacle. * A bisexual flower has both androecium and gynoecium, while a unisexual flower has either androecium and gynoecium. * Flowers can also be ... Read more

Plant Tissues * Tissues are a group of cells similar in structure and function. * Plant tissues include meristematic and permanent tissues. * Permanent tissues often form protective covering in the form of epidermis and cork. * Permanent tissues are of two types: simple and complex. * Simple tissues include parenchyma, collenchymas and sclerenchyma. * ... Read more

An Overview of Cell * Cell is the fundamental unit of life in all living organisms. * Modern cell theory states that:     • Living organisms are composed of cells and products of cells.     • Cells arise from pre-existing cells. * The plant cell is surrounded by a cell wall on the ... Read more