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Explain the term- lichens
The lichens are able to extract nutrients from the rocks . They are capable of retaining water for a long time during which chemical processes take place, e.g. alumino-silicates which are important components of rocks are converted to simple clay molecules by the process of hydrolysis and carbonation.
Precautionary Measures Against Ionising Radiations The following guidelines are suggested for experiments using low activity radioactive materials: (1) Avoid skin contact
What is relative location? Relative location is the location of something in relation of another place.
List any three human activities that you think would lead to air pollution. The following three human activities would lead to air pollution: (i) Burning of fossil fuels such
Carbon l4 with a half-life of 5,568 years is used to date a sample of wood. Sample has l/8 the carbon l4 contained in a living tree of same species. Approximately how old is specim
Energy Flow in the Ecosystem The principal source of energy for any ecosystem is sunlight. All food materials that we or other animals consume are manufactured directly or i
Explain the Posterior Nerve Root Posterior nerve root consists of sensory nerve fibres, having cell bodies in root ganglions and enter the spinal cord. Immediately after emergi
Explain Examination of Urine Examination of urine is done to detect the presence of any abnormal constituent(s) and hence can be used as an important screening test for identif
How water acts towards fat Half-fill a tall glass jar with warm water. Add some olive oil or other oil to a depth of about 1 cm. Shake this mixture hard. View how the fat is br
how do temperature affect the soil
what is an easy way to learn everything about photosynthesis?
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