Hemorrhage is the escape of blood from a blood vessel or the heart. In rupture of the wall of a vessel, hemostatic mechanisms start to control the hemorrhage. A small hemorrhage may have no bad effect but an acute massive hemorrhage threatens the life. Chronic blood loss produces an iron-deficiency anemia. Hemorrhage may be local … Read more
Auxin is a indole radicle plant hormone which is produced by growing tip of a coleoptile and influence growth rate of the cells and also encourages the length of roots and stems of plants. This type of hormone contains different types of organic acid. The plant hormone auxin and its role were first discovered by … Read more
There are various synthetic organic compounds which are applied to plants to give some positive responses. These compounds are artificial plant hormones which help in a deficient concentration (< 0.001 M) in maintaining of growth and development of the plants. These are now widely used to get a better result in the field of agriculture … Read more
British physiologist William Harvey (1628) first of all expressed the plan of special type of system within the body. This system is called the blood circulatory system. In our body, this special system perform several functions like carrying food substances, respiratory gases, excretory wastes, and control body temperature and metabolic activities, prevent infection and coordinate … Read more
Virus is an infectious agent with microscopic size that needs living cells of plants, animals or bacteria to multiply. The name virus is derived from Latin word meaning “poison” or “slimy liquid”. There are various economic importance of viruses. It is used in preparation of sera and vaccines to prevent various diseases. They are not … Read more
Gametes are produced by the animals through meiosis cell division from diploid mother cells (gonads). There are two types of gonads such as testis in males and ovaries in females. The process of gamete production (ovum and sperm) is known as gemetogenesis (Gr. Gamos=marriage; genesis=origin). Testes produce male gametes or sperms through the process of … Read more