Notes and Study material for Exams
Forest ecosystem includes a complex assemblage of different kinds of biotic communities. Optimum conditions such as temperature and ground moisture are responsible for the establishment of forest communities. Forests may be evergreen or deciduous which are distinguished on the basis of leaf into broad-leafed or needle leafed coniferous forests in the case of … Read more
Grassland Grassland, area in which the vegetation is dominated by a nearly continuous cover of Grasses. Grasslands occur in environments conducive to the Growth of this plant cover but not to that of taller Plants, particularly trees and shrubs. The factors preventing establishment of such taller, woody vegetation are varied. Grasslands are one of the … Read more
ECOLOGY and Ecosystem Ecology The scientific study of the processes influencing the distribution and abundance of organisms, the interactions among organisms, and the interactions between organisms and the transformation and flux of energy and matter. Ecosystem Ecosystem, the complex of living organisms, their physical Environment, and all their interrelationships in a particular unit … Read more
Biodiversity is defined as the variability among living organisms from all sources including, inter alia, terrestrial, marine and other aquatic Ecosystems and the ecological complexes of which they are a part; this includes diversity within species, between species, and of ecosystems. Basically biodiversity is the total number of genes, species and ecosystems of a region. It includes … Read more
found where rainfall is about 25-75 cm per year, not enough to support a forest, but more than that of a true desert. vegetation formations that are generally found in temperate climates. In India, they are found mainly in the high Himalayas. The rest of India’s grasslands aremainly composed of steppes and savannas. Steppe … Read more
The Greenhouse Effect The greenhouse effect is a natural phenomenon that insulates the Earth . Incoming solar radiations are absorbed and reemitted back from the Earth’s surface as infrared energy, greenhouse gases (GHGs) in the Atmosphere prevent some of this heat from escaping into space, instead reflecting the energy back to further warm the surface. Human … Read more
The components of the ecosystem is categorised into abiotic of non-living and biotic of living components. Both the components of ecosystem and Environment are same. Abiotic Components the inorganic and non-living parts of the world. consists of Soil, water, air, and Light energy etc. involves a ,large number of chemicals like Oxygen, nitrogen-, … Read more
FOOD CHAIN- A food chain starts with producers and ends with top carnivores. The sequence of eaten and being eaten, produces transfer of food energy and it is known as food chain. Grazing food chain-The consumers which start the food chain, utilising the plant or plant part as their food, constitute the grazing food chain. … Read more
ECOLOGY is defined “as a scientific study of the relationship of the living organisms with each other and with their Environment.” The classical texts of the Vedic period such as the Vedas, the Samhitas, the Brahmanas and the Aranyakas–Upanishads contain many references to ecological concepts .The Indian treatise on medicine, the Caraka- Samhita … Read more
Environmental influences are important both at the prenatal and postnatal stages of Human Development. At the prenatal stage, when a fetus is in the mother’s womb, internal or external harmful agents, such as certain legal or illegal drugs, alcohol, lead and pollutants can harm the unborn baby’s development. The mother’s Nutrition, diseases and emotional Stress … Read more