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CSIR NET JRF Life Sciences - Biology Practice Test on Ecology

This practice test is designed to assess your knowledge in ‘ecology’. Choose the best answer from the four options given. When you've finished answering as many of the questions as you can, scroll down to the bottom of the page and check your answers by clicking 'Score'. Percentage score will be displayed along with right answers.
ecology

1. The pyramids of biomass are always inverted in
pond ecosystem
desert ecosystem
grassland ecosystem
forest ecosystem
2. The interspecific interaction between the termites and protozoans(Trichonympha sp.), present in the guts of termites is called
Amensalism
Mutualism
Commensalism
Parasitism

3. The grazing pathway of energy flow is relatively more important then the detritus pathway in
Grassland ecosystem
Tropical forest ecosystem
Pond ecosystem
Marine ecosystem

4. Similar environment in different continents produce similar type of ecosystems. Species occupying similar ecological niche in such disjunct ecosystems are known as
ecological guilds
ecotypes
ecological indicators
ecological equivalents

5. A taxon facing an extremely high risk of extinction in the wild in the immediate future is regarded as
Endangered
Vulneable
Near threated
Critically endangered

6. With reference to ecological niche, consider the following statements:
     1. Often, within the same species, different stages in the organisms'life history occupy different niches.
     2. In some species, niche segregation may occur between sexes. When niches of two species overlap, it always results in the elimination of one species. Which of the statements given above is/ are correct?
1 and 2 only
1 and 3 only
2 only
1, 2 and 3

7. Among the following, which one is the most productive ecosystem in terms of mean net primary productivity (g/m2/ year)
tropical rain forest
tropical seasonal forest
swamp and marsh
coral reef

8. Eutrophication of lakes results in
 1. increase in species richness
 2.increases in detritus content
 3. increase in in nitrate content Which of the statements given above are correct?
1, 2 and 3
1 and 2 only
2 and 3 only
3 only

9. Biological Oxygen Demand (BOD) refers to the amount of oxygen required to
break down the organic materials
facilitate respiration
synthesise organic compounds
convert inorganic materials to their oxides and cause their precipitation

10. Who among the following is assoiated with the description of Y shaped or 2 channel energy flow model applicable to both terrestrial and aquatic ecosystems?
Hardin
Odum
Shelford
Liebig

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