Diseases of plants caused by bacteria

Diseases of plants caused by bacteria Aster yellows Aster yellows,caused by a phytoplasma bacterium, affecting over 300 species of herbaceous broad-leafed plants. Aster yellows is found over much of the world wherever air temperatures do not persist much above 32 °C (90 °F). As its name implies, members of the family Asteraceae are vulnerable to … Read more

Diseases of plants caused by  viruses and their prevention

Diseases of plants caused by  viruses and their prevention Some of the same types of viruses that infect humans can also infect plants. Plants and humans do not transmit viruses to each other, but humans can spread plant viruses through physical contact. Most frequently, plants catch a cold when an insect or other small animal … Read more

Conductors, semiconductors and insulators

Conductors, semiconductors and insulators Materials are classified as conductors, insulators, or semiconductors according to their electric conductivity. The classifications can be understood in atomic terms. Electrons in an atom can have only certain well-defined energies, and, depending on their energies, the electrons are said to occupy particular energy levels. In a typical atom with many … Read more

Vermiculture

Vermiculture Vermiculture means artificial rearing or cultivation of worms (Earthworms) and the technology is the scientific process of using them for the betterment of human beings. Vermicompost is the excreta of earthworm, which is rich in humus. Earthworms eat cow dung or farm yard manure along with other farm wastes and pass it through their … Read more

Piggery

Piggery Pig farming is the raising and breeding of domestic pigs as livestock, and is a branch of animal husbandry. Pigs are farmed principally for food (e.g. pork, bacon, gammon) or sometimes skinned. Breeds of pigs The indigenous pig has been the basis used for pig production for a long period of time. It is … Read more

Economic Botany

Economic Botany The land and waters of the earth sustain a vast assemblage of plants upon which all other living forms are directly or indirectly dependent. These autotrophs have the remarkable property of capturing the inexhaustible energy of the sun to synthesise organic compounds which are vital for the existence of all life on earth. … Read more

Diseases of plants caused by fungi

Diseases of plants caused by fungi Early Blight of Potato The disease is quite common in India, and occurs on about three week old plants. Since this blight occurs earlier than the ‘late blight’ of potato (caused by Phytophthora infestans), it is called ‘early blight.’ Prevention Measures: Field sanitation and rotation of crops can minimize … Read more

Chromosomes

Chromosomes Chromosome, the microscopic threadlike part of the cell that carries hereditary information in the form of genes. A defining feature of any chromosome is its compactness. For instance, the 46 chromosomes found in human cells have a combined length of 200 nm (1 nm = 10− 9 metre); if the chromosomes were to be … Read more

Production of Hybrid seeds and their processing techniques

Seed is the true carrier of technology. In India, three sets of institutions produce seeds:research institutions and agricultural universities; public sector seed producing corporations; andprivate sector firms including multinationals. The last decade has seen two main developmentsin seed market. One, production of quality seed has risen at a rapid rate after 2005-06. And two,public sector … Read more

Properties and modern methods of purification of drinking water

Safe drinking water is the birthright of all humankind – as much a birthright as clean air. The majority of the world’s population, however, does not have access to safe drinking water. This is certainly true in most parts of Africa and Asia. Even in relatively advanced countries such as India, safe drinking water is … Read more

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