Environmental Science and Ecology - Comprehensive Mock Test 15

Question 141 Medium

In existing canal and watercourses network how much water is lost and does not reach the crops?

A) 50% B) 70% C) 90% D) 99%

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Question 142 Medium

How much potential crop production our country is loosing annually?

A) 72% B) 23% C) 25% D) 50%

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Question 143 Medium

How many canals leave the Indus from Sukkur Barrage?

A) 3 B) 5 C) 7 D) 9

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Question 144 Easy

Causes of plant succession are?

A) Environmental changes produced as a result of reaction to the community become favorable for new species of plants B) Physiographic factors produce change in the habitat like flooding of plains, soil erosion, change in temperature, rain et C) Activity of abiotic and biotic factors D) None of these

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Question 145 Easy

A food chain has the following trophic levels?

A) 3 or 4 B) 3 C) 2 D) 1

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Question 146 Medium

In an upright pyramid of biomass, the herbivores occupy the position?

A) 4 B) 2 C) 3 D) 1

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Question 147 Hard

The transfer of energy from one trophic level to another is governed by the 2nd law of thermodynamics. The average efficiency of energy transfer from nerbivores to carnivores is?

A) 25% B) 50% C) 10% D) 5%

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Question 148 Medium

Energy transfer from one trophic level to other in a food chain is?

A) 1% B) 2% C) 10% D) 20%

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Question 149 Medium

According to Odum the light absorbed by the plant cover in terms of kcal/m2/day is?

A) 150 B) 1,500 C) 300 D) 3,000

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Question 150 Medium

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

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

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