Environmental Science and Ecology - Mock Test 55

Question 541

Mark the correct statement with reference to phosphorous cycle?

A) Inorganic phosphates are lost by leaching B) Ocean phosphates are lost by sedimentation C) Soluble phosphates are lost by erosion D) Soil has plenty of dissolved phosphates

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Question 542

Which of the following serves as source of carbon in plants?

A) CO2 of carbonic rocks B) Atmospheric CO2 C) Fossil fuel D) All of the above

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Question 543

The percentage of water bound in lithosphere and sedimentary rocks is?

A) 75 B) 65 C) 85 D) 95

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Question 544

Sulphur is returned to the soil by?

A) Producers only B) Producers and consumers C) Consumers and decomposers D) All of these

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Question 545

In a sugarcane field the net productivity in terms of kg/m2/year, is?

A) 0.2-0.4 B) 2?4 C) 4?6 D) 0.6-0.8

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Question 546

According to Lindemann, the percentage of net production passed on to carnivores is?

A) 28.6 B) 26.8 C) 22.6 D) 22.8

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Question 547

The rate of storage at consumer level is?

A) Secondary productivity B) Tertiary productivity C) Both a & b D) Net productivity

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Question 548

The gross production minus losses in an ecosystem is indicated as?

A) Net production B) Secondary production C) Net storage D) Net primary production

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Question 549

In a forest ecosystem, the numerical relationship between the producers and herbivores?

A) Producers more than herbivores B) Producers equal to herbivores C) Producers less than herbivores D) Variable

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Question 550

The term homeostasis in an ecosystem refers to?

A) A feed back mechanism B) A self-regulatory mechanism C) State of equilibrium D) Influence of production

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