Volvox is a common freshwater free-floating chlorophytic green alga that belongs to Volvocaceae family under order Volvocales of division Chlorophyta. They occur in temporary and permanent freshwater tanks, ponds, pools, ditches, etc. There are some 20 freshwater species of Volvox which prefer to live in colonies with up to 60,000 cells by making a gelatinous … Read more
Johannes Friedrich Miescher (a Swiss physician and biologist) first discovered the Nucleic acids as ‘nuclein’ from the nucleus in 1869. Severo Ochoa de Albornoz (a Spanish-American physician and biochemist) discovered the RNA synthesis mechanism in 1959. He won the Nobel Prize jointly with Arthur Kornberg in Physiology or Medicine for his discoveries. In 1965, Robert … Read more
The inland water bodies consist of small aquariums to nursery ponds, canals, beels, haor, baors (oxbow-lake), rivers, streams, flooded lands, etc. These are called freshwater basins. The more diverse fish types are found in these water bodies. The shape, nature, feeding habits, color, etc. vary from species to species. Their cultivation system is also different. … Read more
Every day we eat food to live. Food is any substance that is consumed by animals to produce energy and aids in the body’s nutrition and growth. It is the animal or plant origin that contains proteins, lipids, carbohydrates, vitamins, and minerals. These components are known as essential nutrients. The nutrients are taken by the … Read more
G. Evylen Hutchinson and Raymond Lindeman first discovered the ecological pyramid. They graphically presented the definite relationship between the various forms of organisms such as producers and consumers at different trophic levels and made the graphical presentation which looks like a pyramid. In this case, the producers make up the base and the successive level … Read more
The adrenal gland is one kind of endocrine gland, which is also known as a suprarenal gland. It is two in number that is placed on the upper pole of each kidney at the level of 1st lumbar vertebra. The right adrenal gland of humans is pyramidal in shape, while the left adrenal gland is … Read more