biology for grade 8

According to this theory, damage to mechanisms that synthesise proteins, results in faulty proteins, which accumulate to a level that causes catastrophic damage to cells, tissues and orga..

PSI PSII Is located on the outer surface of non appressed parts of grana thylakoids & tret channels. Is located on the inner surface of appressed parts of grana thylakoids. Comprises of about 200 - 400 chlorophylls, 50 carotenoids, one molecules of P 700 Comprises of about..

They are eight in number, arranged in form of a broken ring. The vascular bundles are conjoint, collateral and open. Xylem is on the inner surface and phloem on the outer surface. Xylem is described as endarc..

Nature and Scope of Biology..

Nature and Scope of Biology..

Cell division is a method by which new cells are originated from pre-existing cells. The formation of daughter amoebae in amoeba, the development of sex cells and the growth of a young animal or plant into an adult, all involve cell multiplication. In order to multiply in number, cells underg..

Embryology - It is one of the branches of biology which deals with the formation and development of the embryo. The events from initiation of the flower buds to be full development of the embryo are generally considered under embryology. In the earlier stages of embryo development there i..

Minerals are inorganic nutrients. They include both metallic and non-metallic elements, which are taken by the body in the form of salts. There are 24 elements that are used in our body. They have various functions such as formation of tissues such as the bone, conduction of nerve impulses, f..

The skull is the bony framework of the head, arranged in two parts-the cranium which has eight bones and facial skeleton having fourteen bones Human Sk..

Following are some of the diagnostic features of a young dicot stem * Presence of cuticle and trichomes. * Presence of stomata. * Presence of a hypodermis made up of collenchyma. * Presence of a wavy endodermis containing numerous starch grains. * Presence of a bundle cap above each v..