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Enumerate the role of Soil algae on soil flora
Soil algae are microscopic, chlorophyll containing organisms, being the simplest chlorophyllous plants. These are phototrophic aerobic organisms who obtain energy from sunlight through chlorophyll and fix atmospheric carbon dioxide and synthesise their own food. Soil algae occur as unicellular organisms or as filaments or as colonies as seen on the surface soil, which have adequate moisture level and receive sunlight. A few algae may be found as heterotrophs below surface soil, some of the algae are symbiotic while others are nonsymbiotic. Moisture and adequate sunlight are the most significant environmental conditions influencing the algal population. The optimumactivity pH range varies from strain to strain. Algae also help in building up of soil structure, but do not contribute significantly to the biochemical transformation in soil. They contribute a lot to the organic matter level of soil; the blue green algae, in particular, adding nitrogen to the soil.
Why do organisms need water? Organisms need water for the following reasons: (i) All cellular processes need water as a medium. Usually, the reactions that take place in our
Explain the Menopause The cessation of menstruation is menopause. Natural menopause typically occurs between 45 and 55 years of age. It is caused by changes in concentration of
Formation of the solar system: This theory is based on the assvmption that the Sun and all the planets were formed from a huge rotating cloud df interstellar gas and dust.
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discuss the importance of society and culture to existence of man .
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In what ways does over-grazing lead to soil erosion?
how increases in atmospheric concentrations of carbon dioxide and other greenhouse gases cause global warming.
1. Define potential and kinetic energy. 2. State the first and second laws of thermodynamics. 3. Explain how organisms tend to defy the second law of thermodynam
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