1. Aquatic fern which is an excellent biofertilizer :
( A ) Salvinia
( B ) Azolla
( C ) Marsellia
( D ) Pteridium
Answer-( B )
2. Third generation pesticides are :
( A ) Insect repellants
( B ) Pheromones
( C ) Pathogens
( D ) Insect hormone analognes
Answer-( D )
3. Which of the following can cause molecular nitrogen as nutrient ?
( A ) Methanomonas
( B ) Mucor
( C ) Rhizobium
( D ) Spirogyra
Answer-( C )
4. Industrial production of ethanol from starch is brought about by a certain species of :
( A ) Penicillin
( B ) Azotobacter
( C ) Saccharomyces
( D ) Lactobacillus
Answer-( C )
5. Which of the following was an accidental discovery ?
( A ) Penicillin
( B ) Insulin
( C ) Chloramphenicol
( D ) DNA
Answer-( A )
6. Sour taste of vinegar is due to :
( A ) Lactic acid
( B ) acetic acid
( C ) butyric acid
( D ) fumaric acid
Answer-( B )
7. Which one is biofertilizer ?
( A ) Mycorrhiza
( B ) Nitrogen fixing bacteria
( C ) Nitrogen fixing cyanobacteria
( D ) All the above
Answer-( D )
8. Some blue green algae are used as biofertiliser because they can:
( A ) Fix nitrogen
( B ) Secrete nuclilage
( C ) Perform photosynthesis
( D ) Grow everywhere
Answer-( A )
9. An insect repellent neem product is :
( A ) Rotenone
( B ) Azadirachtin
( C ) Parathion
( D ) Endrin
Answer-( B )
10. Bt cotton is resistant to :
( A ) Insects
( B ) Herbicides
( C ) Salt
( D ) Drought
Answer-( A )
11. The process of increasing soil fertility by earth worms is
( A ) Worm casting
( B ) Vermi composting
( C ) Compost bedding
( D ) None of these
Answer-( B )
12. In gobar gas maximum amount is that of :
( A ) Propane
( B ) Methane
( C ) Butane
( D ) CO2
Answer-( B )
13. Which of the following step is taken by Govt. of India to protect rivers from water pollution ?
( A ) Ganga action plan
( B ) Narmada action plan
( C ) Yamuna action plan
( D ) Both (A) and (C)
Answer-( D )
14. Bacteria present in the rumen of cattle is :
( A ) Azotobacter
( B ) Rhizobium
( C ) Methanobacterium
( D ) Azospirillum
Answer-( C )
15. In the sewage treatement, bacterial of are allowed to sediment in a settling tank. This sediment is called :
( A ) inactivated sludge
( B ) activated sludge
( C ) primary sludge
( D ) secondary sludge
Answer-( B )
16. During primary treatment of sewage solid particles that settle down are called
( A ) flocs
( B ) primary sludge
( C ) activated sludge
( D )anaerobic sludge
Answer-( B )
17. Which of the following organism is used in the production of beverages?
( A ) Penicillium notatum
( B ) sacharomyces cerevisac
( C ) Aspergillus niger
( D ) Clostridium butylicum
Answer-( B )
18. Which of the following microbes is a proteinaceous infectious agents ?
( A ) Fungi
( B ) Prions
( C ) Bacteria
( D ) Protozoa
Answer-( B )
19.Cyanobacteria are :
( A ) heterotrophs
( B ) chemotrophs
( C ) autotrophs
( D ) organotrophs
Answer-( C )
20. The chemicals produced by some microbes to kill or retard the growth of other microbes are called :
( A ) antiseptics
( B ) antacid
( C ) antibiotics
( D ) all
Answer-( C )
