Fertilizers cause
1. eutrophication of water bodies
2. survival of most microorganisms
3. destruction of crumb structure of soil
4. all the above
Which of the above is/are correct?
(a) 1 and 3 (b) 2 and 4 (c) 1, 2 and 3 (d) All of these
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Given the statement :"Buses are the cause of more accidents than cars, and trucks cause fewer accidents than buses",
(d) None of the above
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Heavy water is obtained by a) Boiling water b) Fractional distillation of water c) Prolonged electrolysis of water d) Heating water
c) Prolonged electrolysis of water
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What is/are the characteristics of a water body with cultural eutrophication?
(b) Cultural eutrophication will result in loss of flora and fauna as eutrophication of water bodies do not allow oxygen to pass through it.
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Food chain in which microorganisms breakdown the food formed by primary producers is
(b) The dead organic matter of plant or animal is called as detritus. While a part of it remains on the soil surface as litter, the other part enters the...
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Which of the following conditions for the survival of corals are correct? 1. The water temperature must not fall below 20°C
(d) 1, 2 and 4
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Food chain in which microorganisms breakdown the food formed by primary producers is (a) parasitic food chain
(b) The dead organic matter of plant or animal is called as detritus. While a part of it remains on the soil surface as litter, the other part enters the...
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Eutrophication in the Chesapeake Bay along the eastern edge of Maryland bas resulted in low
The Right option is :(a) 1 and 3
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Eutrophication of a lake most likely is the result of 1. Elevated nitrogen gas level in water.
The Right option is :(c) 1 and 2
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What is the cause of hardness of water ? Why soap does not form lather with hard water?
Presence of Ca2+ ions and Mg2+ ions. Formation of insoluble calcium and magnesium salts with soap. Soap gets wasted simply as it does not form lather with soap.
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Two bodies of unequal mass are moving in the same direction with equal kinetic energy. The two bodies are brought to rest by
Work done = change in KE Both bodies had same KE and hence same amount of work is needed to be done. Since force aplied is same, they would come to...
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