Definition Phytogeography is the study of distribution of plant species and elucidation of origin of flora. The relative position of the 6 continental land masses and large number of islands play an important role in the distribution of various types of plants over the surface of the earth. Factors …
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Components of Water Budget The water budget of a unit area of the earth’s surface is formed from the components: P = precipitation E = Evaporation D = Discharge, Runoff R = Reserve, storage and U = Use, consumption The conservation law for water satisfies the water balance. P = …
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Geosphere The area near the surface of the earth can be divided into four inter-connected “geo-spheres” – lithosphere, hydrosphere, biosphere and atmosphere. The names of the four spheres are derived from the Greek words for stone (litho), air (atmo), water (hydro), and life (bio). Lithosphere The lithosphere is the …
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Sampling Measuring a small portion of something and then making a general statement about the whole thing is known as sampling. Sampling is a process of selecting a number of units for a study in such a way that the units represent the larger group from which they are selected. …
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Ecological succession is the process of change in the species structure of an ecological community over time. It is the gradual process by which ecosystems change and develop over time. In this article, Types, Examples, Causes and Varoius models of Ecological Succession will be discussed in detail. Definition Ecological succession …
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[Click here to read ‘Bichemical Cycle (part- 1 )’ ] Threats to the Carbon Cycle Decline in forest growth. Killing of ocean phytoplankton due to rising sea temperatures. Death of forests due to spread of disease and insects. Melting permafrost layer (In geology, permafrost or permafrost soil is soil at or …
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Definition A biogeochemical cycle or nutrient cycle is a pathway by which a chemical element or molecule moves through both biotic (biosphere) and abiotic ( lithosphere, atmosphere, and hydrosphere ) compartments of Earth. ★Nutrient cycle involves 2 general phases- The environmental phase – in which the chemical nutrient is present in …
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Ecology is the scientific study of the interactions that determine the distribution and abundance of organisms. It is the total relationships of animals to both its organic and inorganic environment’. It can be said that there is very little that is not ecology. In this article, the Definition, Subdivision, and …
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Do you ever notice any cacti in a normal field or pond? Or ever seen any Mango, Jackfruit, or other fruiting trees in the seashore? It’s not to happen. And here comes the fact of adaptation of plants in different habitats. Adaptations are special features that allow a plant or …
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Plants that survive in the saline condition are known as halophytes. Since halophytes can not easily absorb water, they develop almost all important xerophytic devices for optimum use of water. Habit Majority of halophytes in the tropical and subtropical regions are shrubs (dome-shaped), but a few of them are herbaceous …
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Plantlet The Blogging Platform of Department of Botany, University of Dhaka