Group 11: Gymnospermae
sidraThey 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…
Sex Limited Trait
rubabThe 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…
ZIN MECHANISM
This type of sex — determination pattern is common in birds. butterflies and moths. It was discovered by .1. Seiler in 19 14 in 1110111. It is the reverse of…
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.…
MECHANISM OF ABSORPTION OF WATER
sanaWATER 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…
Classification system of Carolus Linnaeus
The classification system of Linnaeus was based on floral characteristics. He chiefly used characters of stamen's. Therefore, his system is called sexual system. This system is very convenient for the…
PLASMA MEMBRANE
abidaThe plasma membrane surrounds the cell. Chemically plasma membrane is composed of: Protein: 60 to 80% Phospholipids: 20 to 40 % Cholesterol in small amount Carbohydrates in small amount Fig:…
XO MECHANISM
The sex determining mechanism in which sex is determined by In X chromosome only is called X() mechanism. This pattern of sex determination is found in grasshopper and protenor bug.…
SEX DETERMINATION
The chromosomes which determine sex in the different organisms are called sex chromosomes. 'Fhe term -sex- refers to the processes that enable species to exchange materials between homologous chromosomes. Ii…
CELL, TISSUES 0 GAN 14 ORGAN SYSTEM OF ANIMAL
CE L All animals are made up of cells. The cell plays a fundamental role in the understanding of zoology. It also helps in the understanding of chemistry. Cell is…