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Restoration of fertility
The fertility of the topsoil can be restored by taking the following measures. a) Regular use of manures and fertilizers can replenish the minerals used by the crops. Green manuring can also be done. b) Crop rotation should be practiced c) New techniques of applying water benea..
Replenishment of soil by addition of manure and fertilizers
The farm yard manure or organic manure or bio fertilizers and inorganic fertilizers supply the necessary plant nutrients to the soil. Thus, application of such materials increases the nutrient value of the soi..
Organic Chemistry Introduction
Introduction - Organic chemistry is that branch of chemistry which deals with the study of compounds of carbon with hydrogen (hydrocarbons), and their derivatives. Presently about five million organic compounds are known. Since the synthesis of urea from ammonium thiocyanate, ma..
Soil Pollution
Soil is the thin layer of organic and inorganic materials that covers the Earth's rocky surface. The organic portion, which is derived from the decayed remains of plants and animals, is concentrated in the dark uppermost topsoil. The inorganic portion made up..
Developmental Biology
(Embryology) It is the study of early life history of individual organisms from the fertilized egg to the adult stage (Ontogeny..
Soil Erosion
Land is also a precious resource. Land is needed for agriculture and occupation. Land is under pressure due to increasing population. Land for agriculture has to be fertile in order to be able to support a good crop. The fertility of land lies in the quality of the soil. Soil is..
Speciation (origin of new species)
A species is a group of similar organisms, which can breed among themselves producing fertile offsprings. The members of a species not only share a common gene pool, but also share a common ancestr..
Agriculture
The pH of the soil is very important for having proper crop yield. The soils get buffered due to the presence of salts such as carbonates, bicarbonates, phosphates and organic acids. The choice of fertilizers depends upon pH of the soi..
Nitrogen Cycle
. Plants convert the inorganic nitrates to organic proteins. The proteins from the plants enter the body of animals in form of food. C) How is nitrogen returned to the soil? When plants and animals die their bodies decompose. The organic proteins undergo a series of ch..
Meiosis
Meiosis - Meiosis is a cell division occurs in reproductive cells (gametes). The male gamete is known as the sperm in animals and the female gamete is known as the ovum (egg). These gametes, after they are formed, have no future unless they unite to form a zygote, which then grows into an adult ..
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