Environmental Science and Ecology - Mock Test 51

Question 501

The greatest biomass of autotrophs in the world's oceans is that of?

A) Benthic brown algae, coastal red algae and dephnids B) Benthic diatoms and marine viruses C) Sea-grasses and slime-moulds D) Free-floating microalgae, cyanobacteria and nanoplankton

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Question 502

Which is the most stable ecosystem?

A) Mountain B) Desert C) Forest D) Ocean

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Question 503

Biotic components of an ecosystem include?

A) Producers only B) Consumers only C) Producers and Consumers only D) Producers, consumers and decomposers

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Question 504

Trophic levels are formed by?

A) Only plants B) Only animals C) Only carnivores D) Organisms linked in food chains

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Question 505

The term 'bio-coenosis' was coined by?

A) Tansley B) Warming C) Carl Mobius D) S C Pandya

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Question 506

Which of the following has the largest amount of energy?

A) Producers B) Primary consumers C) Secondary consumers D) Disinfactants

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Question 507

Food levels in an ecosystem are called?

A) Trophic levels B) Consumer levels C) Producer levels D) Herbivores levels

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Question 508

The snakes are included under?

A) Saprophytes B) Primary consumers C) Second trophic level D) None of these

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Question 509

9. In an ecosystem in abiotic components which of the following occurs?

A) Flow of energy B) Cycling of material C) Consumption of materials D) Flow of energy and cycling of materials

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Question 510

The main role of bacteria in the carbon cycle involves?

A) Photosynthesis B) Assimilation of nitrogenous compounds C) Chemosynthesis D) Digestion or breakdown of organic compounds

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