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