Atmospheric oxygen is needed by all terrestrial and aquatic plants and animals for respiration. Twenty-one percent of Earth’s atmosphere has oxygen and this is rapidly cycled between plants, animals, and the atmosphere through photosynthesis and respiration. Photosynthesis During photosynthesis, atmospheric carbon dioxide is converted into glucose inside the leaves of plants. It is a … Read more
Surface Chemistry: Properties of Colloids Due to their small size, colloidal particles do not settle out of solution. Particles lying in the colloidal size range possess an enormous surface area compared with the surface area of an equal volume of larger particles. In order to compare the surface area of different systems, we use the … Read more
Surface Chemistry: Lyophobic, multimolecular and macromolecular colloids Two phases are involved in a colloidal system Dispersed phase – solid, liquid, gas Dispersion medium (continuous phase) — solid, liquid, gas General types of colloidal system: Lyophobic colloids are solvent hating colloids(Lyo means solvent and phobic means hating). There is minimal or no affinity between particles … Read more
Introduction. Pollination is the transfer of pollen grains from the anther of one flower to the stigma of the same or different flower. Self-pollination- transfer of pollen grains from the anther of one plant to the stigma of the same plant. Cross-pollination- transfer of pollen grains from the anther of one plant to the … Read more
The origin of life is a scientific complication which has no solution yet. There is a large number of ideas but few have turn into reality. We will never say anything with conviction because life on earth begins four billion years ago. For life to have gotten ahead there must have been genetic molecules … Read more
The origin of life is a scientific complication which has no solution yet. There is a large number of ideas but few have turn into reality. We will never say anything with conviction because life on earth begins four billion years ago. For life to have gotten ahead there must have been genetic molecules … Read more
Surface Chemistry: Lyophilic colloids The nature of interactions between a dispersed phase and dispersion medium directs the colloidal solutions to be classified into two types as lyophilic and lyophobic sols. Lyophilic colloids aresolvent loving(Lyo means solvent and philic means loving). These are the colloidal solutions, in which the particles of the dispersed phase have a … Read more
Oogenesis also known as ovogenesis or oögenesis is the differentiation of the ovum(egg cell) into a cell competent to further develop when fertilized. Oogenesis start with a single germ cell called an oogonium by which it undergoes mitosis so as to increase in number resulting to one up to two million cells in the … Read more
Nutrient cycling is an important process that happens in any ecosystem. The nutrient cycle describes the movement, use, and nutrient recycling in the environment. Valuable elements which are vital to life must be recycled for organisms to exist and survive. These valuable elements are carbon, phosphorous, hydrogen, nitrogen and oxygen. These cycles include both … Read more
Surface Chemistry: Enzyme catalysis and colloidal state Enzymes are extremely effective biologically active catalysts. They are homogeneous catalysts, reacting in solution with body fluids. Only one type of molecule selectively fits the active site in its “lock and key” mechanism. Therefore, enzymes are very specific as to what they catalyse on a specific substrate. Enzymes … Read more