Cytokinins

Cytokinins After the discovery of auxins and gibberellins and their influence on growth and development, efforts were diverted to find the factors that would stimulate plant cells to divide. These efforts led to the discovery of cytokinins, they were found to effect other physiological and developmental processes as well. Kinetin Folke Skoog tested many substances for their ability to stimulate ...

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Gibberellins

For many years after the discovery of auxin, plant scientists attributed all the development and plant processes taking place in plants to auxin. In 1950s another groups of growth substances, the gibberellins, was discovered. The main effect of the hormone was tallness in plants and chemically it was recognized as gibberellic acid (GA). Later many more, about eighty gibberellins were ...

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Ectocarpus

Occurrence Ectocarpus is a brown alga. It is abundantly found throughout the world in cold waters. A few species occur in fresh waters. The plant grows attached to rocks and stones along coasts. Some species are epiphytes on other algae like members of Fucales and Laminaria. Ectocarpus fasciculatus grows on the fins of certain fish in Sweden. Ectecarpus dermonemcnis is ...

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SOIL EROSION

The wearing away of the soil by wind, water, snow or gravity is called soil erosion. Climatic, topographic. biotic, edaphic, and geologic factors cause the soil erosion. Climatic factors: Wind and rainfall are climatic factors. Topographic factors: Length of slope is a topographic factor. Biotic factors: Uncontrolled grating of vegetation by animals and cutting of vegetation by man are biotic ...

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Batrachospermum

Occurrence Batrachospermum is fresh water alga. It is found in clear, cool and running streams. Deep water plants are dark violet or reddish in colour. But the shallow water species are olive green. The intensity of light changes the colour of pigments. The thallus is attached to the substratum. General structure Vegetative structure Tha:lus of adult plant is soft, thick, ...

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DESERTIFICATION

Spreading of deserts to the green areas is called desertification. Desertification occurs due to human activities. Desertification occurs in grasslands and forests. Earlier, vegetation was present there. But over exploitation of these natural resources changes them deserts. These are not natural deserts. But they arc man made deserts. Deserts are characterized by few vegetation and arid land. The ruins of ...

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Polysiphonia

Occurrence Polysiphonia is a marine alga. It is present along the coast of oceans. It is attached to the rocks or other substratum. Some members are epiphytes. General structure Vegetative structure Plan body is composed of branched filamentous and basal attachment disc. Attachment discs: The basal attachment disc is formed of several non septate, branched rhizoids. Vertical portion: The vertical ...

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Environmental Management

There are following application of ecology in different environmental managements: Land management The operation by which land is prepared for crops plantation, harvesting is called land management. Good land management increases efficiency. Poor land management cause soil erosion, salinity and water logging. It changes the fauna and flora of the soil. Increased knowledge of ecology improves the land management techniques. ...

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ECOLOGICAL MANAGEMENT

There are following application of ecology in different environmental managements: Land management The operation by which land is prepared for crops plantation, harvesting is called land management. Good land management increases efficiency. Poor land management cause soil erosion, salinity and water logging. It changes the fauna and flora of the soil. Increased knowledge of ecology improves the land management techniques. ...

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Auxin

The First Plant Hormone Auxin is the first plant hormone to be discovered and probably the best known of all plant hormones. It plays a major role in the regulation of plant cell elongation and in the growth responses of plants to unidirectional stimuli, known as tropism. Discovery Discovery of auxin is attributed to Charles Darwin and his son Francis ...

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