transportation factoring

. Today, petroleum based automobiles have largely diversified into: public transport vehicles - lorries, buses, trains, trams private transport vehicles - cars, vans, scooters, mopeds, motorcycles The gravity of problem of pollution due to transport vehicles is not the..

+ve and Rh-ve, based on the presence or absence of Rhesus factor, an antigen. In human circulatory system the blood is flows in closed blood vessels called the arteries, veins and their capillaries. Arteries and veins have elastic and muscular walls. Capillaries lack muscles. Arteries ari..

The growth of plants is regulated by certain chemical substances, which are synthesized by the plant in very small quantities. These substances are formed in one tissue or organ of the plant and are then transported to other sites where they produce specific effects on growth and developm..

Cell is the structural and functional unit of the organism. Water is the principal constituent of plants and is essential for the maintenance of life, growth and development. Plants absorb water from the soil through their roots, transport it to other parts of the plant through the xylem ..

The study of world of life is as old as man itself. All living organisms are made up of a few elements which are repeated in each of them. The basic unit of life - cell, is a structural and functional entity of life. Of all the environmental factors that affect plant life, none is more im..

The liver is an important organ in the body, in addition to being a digestive gland. Its importance can be understood by listing its functions which are as follows: It produces bile which helps in digestion of fats and lipids It converts glucose to glycogen and helps to control the level of sug..

+ve and Rh-ve, based on the presence or absence of Rhesus factor, an antigen. In human circulatory system the blood is flows in closed blood vessels called the arteries, veins and their capillaries. Arteries and veins have elastic and muscular walls. Capillaries lack muscles. Arteries ari..

>When the transpiration pull is exerted, a negative pressure or tension is generated in the xylem. About 98% water absorbed by land plants evaporates from aerial plants parts and diffuses into atmosphere. The opening and closing of stomata is controlled by the size and shape of guard cells resultin..

fig. 22.6 Elongation of Polypeptide Chain on a Ribosome The above figure shows, A. A charged tRNA arriving at the A site, reading its codon on the mRNA. B. Amino acid of tRNA at P site is ready to be transferred to the amino acid of tRNA at A site. C. Amino acids are joined by peptide bond and..

Role of potassium, chloride and malate ions in stomatal opening (PEPcase = Phosphoenol pyruvate carboxylase) Levitt (1974) observed that proton (H + ) uptake by guard cells, chloroplasts takes place with the help of ATP. This leads to increase in value of pH in guard cells. Rise in pH converts star..