MCQs on Biofertilizers
1. Which of the following is incorrectly matched?
(a) Alnus – Frankia
(b) Alfalfa – Rhizobium
(c) Nitrogen fixer – Anabaena
(d) Mycorrhiza – Rhodospirrilum
Answer: : (d)
2. Which of the following nitrogen fixers is found in rice fields associated with Azolla?
(a) Tolypothrix
(b) Frankia
(c) Anabaena
(d) Spirulina
Answer: : (c)
3. Which of the following is not a biofertilizer?
(a) Mycorrhiza
(b) Rhizobium
(c) Agrobacterium
(d) Nostoc
Answer: : (c)
4. Which of the following is used as a biofertilizer for soybean crop?
(a) Nostoc
(b) Azospirillum
(c) Rhizobium
(d) Azotobacter
Answer: : (c)
5. Which of the following is commonly used as a nitrogen fixer in paddy fields?
(a) Frankia
(b) Oscillatoria
(c) Azospirrilum
(d) Rhizobium
Answer: : (c)
6. This is not used in organic farming
(a) snail
(b) earthworm
(c) Oscillatoria
(d) Glomus
Answer: : (a)
7. Which of the following is a nitrogen fixer in the root nodules of Alnus?
(a) Clostridium
(b) Bradyrhizobium
(c) Azorhizobium
(d) Frankia
Answer: : (d)
8. Which of the following is a pair of biofertilizers?
(a) Salmonella and E.coli
(b) Rhizobium and grasses
(c) Nostoc and legume
(d) Azolla and BGA
Answer: : (d)
9. Which of the following fern is a biofertilizer?
(a) Salvinia
(b) Azolla
(c) Pteridium
(d) Marsilea
Answer: : (b)
10. Which of the following is an endomycorrhiza?
(a) Rhizobium
(b) Agaricus
(c) Glomus
(d) Nostoc
Answer: : (c)
11. Pick the correct statement
(a) legumes do not fix nitrogen
(b) legumes fix nitrogen independent of bacteria
(c) legumes fix nitrogen through bacteria in their roots
(d) legumes fix nitrogen through bacteria in their leaves
Answer: : (c)
12. Organic farming is the technique of raising crops through the usage of
(a) resistant varieties
(b) manures
(c) biofertilizers
(d) all of the above
Answer: : (d)
13. A biofertilizer involving a pteridophyte host is
(a) Azotobacter
(b) Clostridium
(c) Anabaena
(d) Rhizobium
Answer: : (c)
14. Which of the following plants form a symbiotic relationship with two nitrogen-fixing bacteria Rhizobium and Aero rhizobium in root and stem nodules respectively?
(a) Sesbania rostrata
(b) Crotalaria juncea
(c) Sesbania aculeata
(d) Cyamopsis tetragonoloba
Answer: : (a)
15. This plant is used in sandy soils and as green manure in crop fields
(a) Lantana camara and Saccharum munja
(b) Phyllanthus niruri and Calotropis procera
(c) Azolla pinnata and Dichanthium annulatum
(d) Alhagi camelorum and Crotalaria juncea
Answer: : (d)
