Biofertilizer Questions and Answers

Question 1

What are biofertilizers?

Accepted Answer

Microorganisms that enhance soil fertility

Answer

Chemicals that kill pests

Answer

Synthetic nutrients for plants

Answer

Genetically modified crops

Question 2

Which of the following is a nitrogen-fixing bacterium found in the root nodules of leguminous plants?

Accepted Answer

Rhizobium

Answer

Azotobacter

Answer

Clostridium

Answer

Pseudomonas

Question 3

Azolla is widely used as a biofertilizer for which crop?

Accepted Answer

Rice

Answer

Wheat

Answer

Maize

Answer

Sugarcane

Question 4

Mycorrhiza is a symbiotic association between fungi and the:

Accepted Answer

Roots of higher plants

Answer

Leaves of plants

Answer

Stems of plants

Answer

Flowers of plants

Question 5

Which blue-green alga is used as a biofertilizer?

Accepted Answer

Nostoc

Answer

Spirogyra

Answer

Chlamydomonas

Answer

Ulothrix

Question 6

VAM (Vesicular Arbuscular Mycorrhiza) primarily helps plants in the absorption of:

Accepted Answer

Phosphorus

Answer

Nitrogen

Answer

Potassium

Answer

Calcium

Question 7

Which of the following is a free-living nitrogen-fixing bacterium?

Accepted Answer

Azotobacter

Answer

Rhizobium

Answer

Frankia

Answer

Nitrobacter

Question 8

Biofertilizers are generally preferred over chemical fertilizers because they are:

Accepted Answer

Eco-friendly and sustainable

Answer

More expensive

Answer

Faster acting

Answer

Toxic to weeds

Question 9

Which biofertilizer is commonly associated with sugar cane and maize?

Accepted Answer

Azospirillum

Answer

Rhizobium

Answer

Azolla

Answer

Frankia

Question 10

Phosphate solubilizing bacteria (PSB) include species of:

Accepted Answer

Pseudomonas

Answer

Rhizobium

Answer

Azotobacter

Answer

Anabaena

Question 11

What is the primary role of leghemoglobin in root nodules?

Accepted Answer

To protect nitrogenase from oxygen

Answer

To transport water

Answer

To fix carbon dioxide

Answer

To produce ATP

Question 12

Frankia establishes a symbiotic nitrogen-fixing relationship with which type of plants?

Accepted Answer

Actinorhizal plants (e.g., Casuarina)

Answer

Legumes

Answer

Grasses

Answer

Ferns

Question 13

Which of the following is NOT an advantage of biofertilizers?

Accepted Answer

Instant visible result like urea

Answer

Improve soil texture

Answer

Cost-effective

Answer

Do not cause pollution

Question 14

Cyanobacteria fix atmospheric nitrogen in specialized cells called:

Accepted Answer

Heterocysts

Answer

Akinetes

Answer

Hormogonia

Answer

Nodules

Question 15

Which organism is known as a 'farmer's friend' but is technically a macro-organism used in vermicomposting rather than a microbial biofertilizer?

Accepted Answer

Earthworm

Answer

Rhizobium

Answer

Azotobacter

Answer

Mycorrhiza

Biofertilizer Questions and Answers

What are biofertilizers?

Which of the following is a nitrogen-fixing bacterium found in the root nodules of leguminous plants?

Azolla is widely used as a biofertilizer for which crop?

Mycorrhiza is a symbiotic association between fungi and the:

Which blue-green alga is used as a biofertilizer?

VAM (Vesicular Arbuscular Mycorrhiza) primarily helps plants in the absorption of:

Which of the following is a free-living nitrogen-fixing bacterium?

Biofertilizers are generally preferred over chemical fertilizers because they are:

Which biofertilizer is commonly associated with sugar cane and maize?

Phosphate solubilizing bacteria (PSB) include species of:

What is the primary role of leghemoglobin in root nodules?

Frankia establishes a symbiotic nitrogen-fixing relationship with which type of plants?

Which of the following is NOT an advantage of biofertilizers?

Cyanobacteria fix atmospheric nitrogen in specialized cells called:

Which organism is known as a 'farmer's friend' but is technically a macro-organism used in vermicomposting rather than a microbial biofertilizer?

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