MCQs on Ecology & Biodiversity Conservation -2

1. Which one of the following is a complex in organic fertilizer?
(A) Urea
(B) Super phosphate
(C) Potash

2. The sequence of ease of decomposition of organic compounds in soil is
(A) Lignin – Hemicellulose – Starch – Crude protein – Fat
(B) Crude protein – Starch – Fat – Lignin – Hemicellulose
(C) Starch – Crude protein – Hemicellulose – Fat – Lignin
(D) Fat – Starch – Lignin – Hemicellulose – Crude protein

3. The primary producers in the marine ecosystem are
(A) Eubacteria and Algae
(B) Cyanobacteria and Algae
(C) Algae and Protozoans
(D) All of the above

4. Mycorrhizae can be used as bio fertilizers because they
(A) Fix nitrogen
(B) Fix CO2
(C) Solubilise phosphate
(D) Kill pathogens

5. Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R).
Assertion (A): Some plants with mycorrhizal fungi are able to occupy habitats that otherwise could not inhabit.
Reason (R): The importance of mycorrhizal plant interaction is attested by the fact that 95% of all plants have mycorrhizae.

Choose the correct answer:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.

6. An interactive association between two populations in which one population benefits from the association, while the other is not affected, is
(A) Mutualism
(B) Neutralism
(C) Commensalism
(D) Symbiosis

7. The method for down streaming of ethanol from fermentation broth is
(A) Filtration
(B) Flow cytometry
(C) Distillation
(D) Flame Photometry

8. Ultrafiltration can remove
(A) Suspended solids
(B) Bacteria
(C) Protozoa
(D) All the above

9. A good automobile fuel, in addition to having high calorific value, should have
(A) High ignition temperature
(B) High viscosity
(C) Low ignition temperature
(D) Moderate ignition temperature

10. Reserve food material in algae is
(A) Starch
(B) Cellulose
(C) Protein
(D) None of the above

11. The biodegradability of xenobiotics can be characterized by
(A) Rate of CO2 formation
(B) Rate of O2 consumption
(C) Ratio of BOD to COD
(D) All of the above

12. The soil borne plant pathogens could be controlled by
(A) Lowering pH
(B) Increasing pH
(C) Adding lime
(D) All of the above

13. A selective Lignin degrading fungus belongs to
(A) Soft – rot
(B) Brown – rot
(C) White – rot
(D) Red – rot

14. The drastic reduction in the number of intestinal pathogens during activated sludge process is the overall result of
(A) Competition
(B) Competition and adsorption
(C) Predation, competition and adsorption
(D) Competition, adsorption, predation and settling

15. Which of the following disinfection method does not result in synthesis of organochlorine?
(A) Chlorination
(B) Chloroamination
(C) Ozonation
(D) None of the above



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