The group of cells performing some collective function is called tissue. Tissues organize the body of plant for performing different function. Many types of tissues associate with each other to form tissue system. Vascular system is an example of tissue system. The tissues have following characteristics: Tissues are composed of many cells. These cells may be of one type or ...

WATER Absorption: of water*, root hairs: .[he absorption of \safer from the soil takes place tlitimigh the root hairs. Ihe root hairs are in contact with the wateriilms on the soil particles. ‘[here is a thin lining of cytoplasm inside the root hair. This cytoplasm encloses a large vacuole filled with cell sap. The Cytoplasm and cell sap of the ...

The traits limited to only one sex due to anatomical differences are called a sex limited treat. Such trait affects a structure or function of the body of males or females only. These traits are controlled by sex-linked or autosomal genes. For example: (i).       Genes for milk production in dairy cattle affect only cows. (ii).      Beard growth in humans is ...

XY – MECHANISM This pattern of sex determim tion is round in Drosophila, man and many other organisms. (a) Male: Male is XY. Mite is heterogametic. It produces two types of sex-determining sperms. Half the sperms carry X-chromosome and the other half carry Y — chromosome. Chances for both types of sperms are equal. ) Female: Female is XX. Female ...

The Powerhouse Of The Cell Mitochondria is commonly called as power house of the cell. They provide energy transuding system. This system is used to change the food into chemical energy by oxidative phosphorylation. ATP is synthesized during oxidative phosphorylation. Discovery: Mitochondria was first described by Altmann in 1894. He named them as bioblast. He predicted that bioblast had some ...

Gymnospermae They are shrub or trees. The trees are rdsinous. Stern has central pith. Vascular bundles are present in rings. Secondar) growth occurs due to cambium. Leaves are needle like. They form cones. Ovule is naked. It is not covered by ovary. Pollination occurs through direct contacts. It has three orders:F I. Order Gnetaceae Order Coniferae Order Cycadaeeae Classification system ...

ANATOMY OF ROOT Root has following types of tissues:  Side: The vascular tissue and the pericycle form a tube of conducting cells called stele. Xvlems are present in the centre of the root. Xylems are composed of tracheids and vessels. The xylem of the root is continuous %s al) the xylem tissue in the stein. The xylem tissues are surrounded ...

Sex Linkage in Man  Colour Blindness Color blindness, or color vision deficiency, in humans is the inability to differentiate between som or all colors that other people can distinguish. It is most often of szr.etie nature. But it may also occur because of eye, nerve, or brain da. ,age, or due to exposure to certain chemicals. The English chemi.,t John ...

Sex Linkage in Drosophila Thomas Hunt Morgan (1910) discovered sex linkage in fruit fly Drosophila. It supported the chromosomal theory of heredity. Morgan deveioped cultures of Drosophila flies. He studied different traits like mour of the eye. Normal fruit flies or wild type have bright red eyts One of his coworkers Calvin Bridges discovered a white eye mutan. —ale fly. ...

collenchyma and sclerenchyma tissues Table of Simple Tissues is as Follow   Collenchyma Tissues Collenchyma is a living tissue composed of more or less elongated cells with unevenly thick, glistering, primary non-lignified walls. Collenchyma develops from the elongated cells which resemble procambium or from isodiametric cells of the ground meristems. Collenchyma functions as supporting tissue in young growing organs and ...