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Organisms that synthesise, food with the help of the light energy of the sun, carbon dioxide and water by a process called photosynthesis are called photoautotrophic organism..

Science is the way by which a person gets at the truth or at least as close to truth as possible. The basis of science is its orderly stepwise procedure - the scientific method. Scientific method employs various procedures such as, accurate observation, asking questions about the observatio..

Biology is a branch of science that deals with the study of life. Hence, it is also called life science. The simple curiosity of human beings to observe nature and the human basic instincts for survival and gathering food probably had a role in the birth and development of biology. Biology ..

>Nitrogen fixation is primarily by symbiotic bacteria - Rhizobium or by free living cyanobacteria. For nitrogen fixation, a large amount of energy is derived from ATP molecules. The dinitrogen molecule is reduced to ammonia with the help of enzyme nitrogenase. The nitrifying bacteria conv..

While the nervous system and endocrine system have their own features, they have a common method of communication. Both the systems release chemicals to communicate between cells. Together these two systems carry out a very complex process of maintaining a homeostatic (balanced) internal environme..

Angiosperms represent the most recent and the most advanced group of plants. Angiosperms have been of immense importance to humans, more than any other group. There have been several attempts to classify angiosperms. One of the earliest attempts was that of Carolus Linnaeus. He was the f..

. They show a (9+o) arrangement of microtubules. They are involved in the formation of spindle fibres during cell division and the basal bodies of cilia and flagella. Cilia and flagella are found in the surface of motile cells. They show a (9+2) arrangement of microtubules. These structures he..

Summary - In lower organisms, there is no transport system as the cells are in touch with the surrounding medium. The transport is by the physical processes like diffusion, osmosis, etc. With the advancement in structure, the organisms have to evolve methods to transport nutrients and was..

. The two-kingdom classification has certain demerits, particularly with reference to lower forms of life which show common features with both plants and animals. In 1858 Earnt Haeckel proposed the three-kingdom classification in which apart from Plantae and Animalia, a new kingdom Protista was cre..

>The largest herbarium in our country is the central National Herbarium at Calcutta. It has about 1,000,000 plant specimens. A botanical garden is mainly a place for growing plants, which produce, colorful varieties of flowers. A botanical garden has a collection of ornamental, medicinal and other ..