UPSC  Biology

1. The pyruvic acid formed during glycolysis is oxidized to CO2 and H2O in a cycle called

Calvin cycle Nitrogen cycle Hill reaction Krebs cycle

2. respiratory quotient (RQ) is one in case of

Fatty acids Nucleic acids Carbohydrates Organic acids

3. An example of free living nitrogen fixing aerobic bacteria is

Clostridium Rhizobium Azotobacter Rhodospirillum

4. Identify the plant belonging to the Reed-Swamp stage in hydrarch succession

Juncus Sagittaria Salix Trapa

5. A gas produced by paddy fields and connected with global warming is

CO2 Chlorine H2S Methane

6. If the strong partner is benefited and the weak partner is damaged, it is known as

Predation Allelopathy Symbiosis Commensalism

7. acid rain is mainly caused due to increase in the levels of the gas(es)

SO2 only CO2 only SO2, CO2 NO2 and SO2

8. The flow of energy among various trophic levels of an ecosystem is

Unidirectional Bidirectional Multidirectional Circular

9. Increase in atmospheric temperature due to CO2 is called

Pasteur effect Green-house effect Blackman effect Emerson effect

10. The protective-ozone layer is present in

Ionosphere Stratosphere Troposphere Lithosphere


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