Question 1

Which most often limits the primary productivity of the ecosystem?

Accepted Answer

Correct answer is A

Question 2

Which type of pyramid of energy is inverted?

Accepted Answer

Correct answer is D

Question 3

Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?

Accepted Answer

Correct answer is B

Question 4

Pyramid of energy in a pond ecosystem is always:

Accepted Answer

Correct answer is B

Question 5

Consider the following statements concerning food chainsA. Removal of 80 % tigers from a area resulted in greatly increased growth of vegetationB. Removal of most of the camivores resulted in an increased population of deersC. The length of food chains is generally limited to 3-4 trophic levels due to energy lossD. The length of food chains may vary from 2 to 8 throphic levelsWhich two of the above statements are correct?

Accepted Answer

Correct answer is C

Question 6

In an aquatic ecosystem, the trophic level equivalent to cows in grassland is:

Accepted Answer

Correct answer is B

Question 7

Select the formula for ecological efficiency:

Accepted Answer

Correct answer is D

Question 8

Identify which one of the following is an e.g. of incomplete ecosystem:

Accepted Answer

Correct answer is B

Question 9

Benthic organism are affected most by:

Accepted Answer

The sediment characteristics often determine the type of benthic animals that can thrive there.

Question 10

Identify the correct type of food chain:dead animal → blow fly maggots → common frog → snake

Accepted Answer

Correct answer is B

Question 11

Energy and nutrients enter a community by:

Accepted Answer

Producers are mainly photosynthetic plants, and they can convert light energy to kinetic energy and this energy passes in all trophic levels.

Question 12

Which of the following is an example of man-made ecosystem?

Accepted Answer

Correct answer is B

Question 13

The detritus food chain begins with:

Accepted Answer

Correct answer is D

Question 14

Bacteria and fungi in a forest ecosystem are generally:

Accepted Answer

Decomposers are usually bacterium or fungus that breaks down dead organic matter (cells of dead plants and animals) into simple substances.

Question 15

Energy flow and energy transformations in living systems strictly conform to the:

Accepted Answer

In ecosystem energy transfers from one form to another and some energy loss in the form of heat, it follows the Ind  law of thermodynamics. The second law of thermodynamics states that, "Process involving energy transformation will not occur spontaneously unless there is degradation of energy from non random to a random form",

Question 16

An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having:

Accepted Answer

Correct answer is C

Question 17

These belong to the catergory of primary consumers :

Accepted Answer

Correct answer is D

Question 18

A man-made ecosystem is:

Accepted Answer

Man-made ecosystem or artificial ecosystern have low diversity and is more vulnerable to sudden changes. Crop ecosystems are man made ecosystems.

Question 19

Which of the following supports a dense population of plankton and littoral vegetation?

Accepted Answer

Correct answer is B

Question 20

The pyramid of numbers of a parasitic food chain in a forest ecosystem is:

Accepted Answer

Correct answer is A

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