Human Population may be defined as a group of organisms belonging to one species which occupy a given area. It has characteristics which are a function of the whole group and not of the individuals. These are population density, birth rate, death rate, age distribution, biotic potential, rate of dispersion and growth form. … Read more
As a result of the complex chemical reactions taking place within the body, certain metabolic waste products are formed. For example : large amounts of CO2 and water are produced from metabolism of carbohydrates, fats and proteins. We are going to discuss about Excretory System, products from Excretory System & structure of kidney. Ammonia, urea … Read more
Human heart is a reddish brown, pulsatile, pumping centre. It pumps and collects blood to and from the various body parts. It is of the size of a human closed fist. It weighs about 300 g. It is a broad conical structure. Upper side of human heart is broad called base and the lower pointed … Read more
Formed (cellular) elements Formed (cellular) elements (RBCs, WBCs and Platelets) are shaped structures visible under the microscope as cells and cell-like structures present in the blood. They form 42 – 45% of blood. These are of three types i.e., Red Blood Cells (RBCs) or Erythrocytes. White Blood Cells (WBCs) or Leucocytes. Blood platelets or Thrombocytes. … Read more
Filling the petrol tank of a motor car is of no use, unless there is a pipeline to carry the petrol from the tank to the engine. Similarly, digesting food in alimentary canal and absorbing O2 from external environment in respiratory organs shall be of no use to an animal unless the digested nutrients and … Read more
Normally, plants are fixed in the soil and do not move here and there. However movement is seen in certain cases. We are going to read about Tropic Movements in Plants. Chlamydomonas and Volvox show movement by means of flagella. Mosses and ferns are ciliated and move about in water. Plants show movement in response … Read more
Growth is one of the most fundamental characteristics of all living organisms. We are going to discuss about Plant Hormones : Auxins, Gibberellins, Cytokinins, Ethylene and Abscisic Acid. It is the net result of various processes that together cause an irreversible permanent increase in the size of an organism or its parts. In plants, growth take … Read more
If you are searching that, ” What are the different types of transpiration ?”. Then you are at the correct article because we are going to discuss about definition, types, process and factors of transpiration. Plants absorb large quantities of water as well as mineral salts from the soil with the help of their roots. … Read more
It is a matter of common observation that all the individuals belonging to one species are alike. Humans resemble one another and so do the dogs, cats, tigers, mango plants, wheat or pea. This is natural because every living organism in this universe maintains its continuity by producing progeny similar to them by the process … Read more
The word Chromosome is derived from two words (Chrome- coloured, soma- body). These are small but thick, rod like darkly stainable structures. These are seen in the nuclei of dividing cells only at metaphase and anaphase stage of cell division. Whereas in non-dividing cells they are seen as a network of thread-like structures called … Read more