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Describe The Light Reaction Of Photosynthesis

745 words - 3 pages

BINDURA UNIVERSITY OF SCIENCE EDUCATIONFACULTY OF SCEINCE EDUCATIONDEPARTMENT OF BIOLOGICAL SCIENCESNAME : MAFASHU ELISHAREG NO. : B1437735PROGRAMME : DIPLOMA IN SCIENCE EDUCATIONCOURSE : BZ003 PLANT AND ANIMAL NUTRITIONACCADEMIC YEAR : PART 1.2 [2014]LECTURER : MS MUYAMBOASSIGNMENT : 3TOPIC: Write notes on the following;. Hydroponic [10 marks]. Neural and hormonal control of digestive system [10 marks]. C3, C4 and CAM plants [10 marks]. Symptoms of deficiency of macro minerals in plants [10 marks](a). Hydroponic is a soil-free plant growing system, where a controlled nutrient rich solution supplies plant roots with nourishment. These systems may be stored outdoors with overflow safeguards, contained in greenhouses or within buildings with artificial lighting to supply essential ultraviolet radiation for plant growth. In hydroponic system plants may be supported in porous media, pots, perforated tubes or channels. Water with nutrients and other garden chemicals in solution are recycled and replenished until harvest or build-up contaminants such as salts or pathogens requires the solution to be replaced. Hydroponic system has been successfully employed for the commercial production of seedless cucumbers, tomatoes and even lettuce. The system has been favoured by most growers for its benefits. It enables crops to be produced on non-arable land with poor soils and contaminations, that is, with high salinity levels. In this case the grower does not to have good soils since the pots or bags are placed on top of the ground. Plant roots do not grow through the soil that might contain diseases or pests such as nematodes; instead they are contained in bags or pots.(b). Digestive system in a human body is not as simple as it sounds. A good digestion, which is the breaking down of food into smaller soluble particles, is essential for the proper performance of all other systems in the body. Like any other system in the body, the digestive tract is under neural and hormonal control.The digestive system can be controlled by the nerve system for it to function well. This nerve system can be divided into two that is, the somatic nervous system and the autonomic nervous system. The somatic or extrinsic nervous system enables the body to adapt to stimuli from the external environment like touch and smell. Somatic nerves come to the...

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