Living Beings or Living Organisms: Living organisms are those which possess the characteristic of life and are essentially made up of a life-giving substance called Protoplasm which forms cells and tissues of one kind or the other. Example- plants and animals are living beings. Important characteristics of Living Organisms: Metabolism: Living things have the ability
Cell Cycle associated with Interphase: Each cell capable of division passes through a sequence of events called the cell cycle. The cell cycle of a somatic cell usually consists of long interphase followed by a short mitotic or M-phase. The biochemical analysis of interphase nucleus has revealed that interphase is the most active stage in
Conservation of Natural Resources: The natural resources are of two kinds- Renewable and Non-renewable. Renewable natural resources reproduced and, thus, restore themselves in a natural way (example- when trees are cut, they can grow again; soil forms again; animals reproduce their kind). They include soil, water, vegetation (forests and other plants), wildlife and air. Non-renewable
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Ecological Crisis: Ecological crisis is the severe ecological imbalance in nature. Different forms of life (all plants, insects, birds, animals etc.) living in a particular area share a particular environment and depend on each other, directly or indirectly, for their survival. Such a type of association is said to form a system called biological community.
Terrestrial Biomes: Various physical factors such as sunlight (intensity and duration), temperature, rainfall and seasonal changes determine the patterns of life and hence the types of biomes on land. Let us, now, consider the various terrestrial biomes. Forest Biomes: There are four kinds of forest biomes. These are- Tropical Evergreen Forests (or Tropical Rain Forests):
Aquatic Biomes: One of the most essential requirements of life is water. It is available in plenty in the rivers, ocean, large lakes and ponds. Various ecologically essential factors which control and regulate the aquatic life are oxygen content, salinity, temperature, pressure, light, tides and water currents. The aquatic life is of three categories. These
Periodic Law of Mendeleev: Newlands concept of arrangement of elements was further developed to a large extent by Mendeleev (1869), a Russian chemist. Mendeleev pointed out that when the elements are arranged in the order of their increasing atomic weights, those which are chemically similar recur at regular intervals. This relation between the elements was
Charles Law: The volume of a given mass of a gas changes when its temperature is changed. Since the volume of a gas also changes with pressure, the volume-temperature relationship for a gas is studied at a constant pressure. During the experiment, the temperature is changed by dipping the syringe in a beaker containing water
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