Catfish and wallaginia attu shows same Habitat, Petroleum and coal are the sources of Carbon

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Free Online Mock Biology Multiple Choice Test on Organism and Environment

Sub Category : Organism and Environment	Test : 7	Time Left :
1.The atmosphere has layer of ozone at a height of
(1) 22-32 km (2) 32-48 km (3) 48-68 km (4) 68-88 km.
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2.Hydrosphere covers about.... of the earth's surface
(1) 60% (2) 70% (3) 80% (4) 90%.
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3.Amount of salt in 100 kg of ocean water is
(1) 3 kg (2) 4 kg (3) 5 kg (4) 6 kg.
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4.'Catfish and wallaginia attu' shows same?
(1) Ecological niche (2) Habitat (3) Both of these (4) None of these.
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5.Petroleum and coal are the sources of?
(1) Hydrogen (2) Nitroen (3) Carbon (4) Oxygen.

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Free Online Mock Biology Multiple Choice Test on Organism and Environment