Biofertilizers

Q.

Compare the use of manure and fertilizers in maintaining soil fertility.

Q.

Give two examples of fertilisers.

Q.

Biofertilizers Include

1. Bacteria

2. Cyanobacteria

3. Mycorrhizal Fungi

4. All Of These

Q.

What are fertilizers? Name any two fertilizers.

Q.

Which of the following is a benefit of microbial fertilisers?

1. Increase in the soil pH.

2. Increase in the growth of weeds.

3. Increased nutrient content in soil.

4. Increased pests and insects.

Q.

Name the two types of substances which are added to fields by farmers to maintain the fertility of the soil.

Q. Which macronutrient is required in largest quantity by plant
a.nitrogen
b.molybednum
c.potassium
d.copper

Q.

Name any two main sources of biofertilizers.

Q.

Which of the following plants are used as green manure in crop fields and in sandy soils?

1. Dicanthium annulatum and Azolla pinnata

2. Crotalaria junecea and Alhagi camelorum

3. Calotropis procera and Pitylanthus niruri

4. Saccharum munja and Lantana camara

Q.

Fertilizers are:

1. Non-biodegradable

2. Biodegradable

3. Nutrient specific

4. Both A and C are correct

Q. Why do farmers prefer biofertilizers to chemical fertilizers these days? Explain.

Q.

Organisms called methanogens are most abundant in:

1. Hot springs

2. Sulphur rocks

3. Cattle yards

4. Polluted streams

Q.

(i) Define fertilizers and manures.

(ii) State two limitations of manures.

(iii) Write two advantages of fertilizers over manures.

Q.

___________helps to increase the production of food.

Q. Which one of the following is not a bio fertilizer?

1. Rhizobium
2. Nostoc
3. Mycorrhiza
4. Agrobacterium

Q. Cow dung that is used as a fertilizer can be replaced by

1. Insecticides.
2. Pesticides.
3. Biofertilizers.
4. None of the above.

Q.

How do I increase the production of algae?

Q.

The common biofertiliser used in organic farming is:

1. Margosa

2. Pyrethrum

3. Green manure

4. Nitrogen fixing bacteria and cyanobacteria

Q. Write any three differences between manure and fertilizer.

Q.

Give two examples.

Fertilizers

Q. Which of the following plants are used as green manure in crop field and in sandy soils?

1. Crotalaria juncea and Alhagi camelorum
2. Calotropis procera and Phyllanthus niruri
3. Saccharum munja and Lantana camara
4. Dichanthium annulatum and Azolla nilotica

Q. In the soil, which nutrient is enriched by blue-green algae (cyanobacteria)?

Q. Assertion :Biofertilizers are preferred to chemical fertilizers. Reason: Chemical fertilisers are generally more expensive and hazardous to environment.

1. If both assertion and reason are true and reason is the correct explanation of assertion.
2. If both assertion and reason are true but reason is not the correct explanation of assertion.
3. If assertion is true but reason is false.
4. If both assertion and reason are false

Q.

Which one of the following is not a bio fertilizer?

1. Nostoc
2. Rhizobium
3. Mycorrhiza
4. Agrobacterium

Q.

Compare the use of manure and fertilizers in maintaining soil fertility.

Q. What are Biofertilizers? Give some examples.

Q.

State two advantages of fertilizers or manures.

Q. Biofertilizers increase the _________ content of the soil.

1. Nutrient
2. Humus
3. Water
4. None of the above

Q. Biofertilizers are organisms that enrich the nutrient quality of the soil. Which of the following can be used as biofertilisers ?

1. Nitrogen fixing cyanobacteria
2. Nitrogen fixing bacteria
3. Mycorrhizae
4. All of these

Q.

Some blue-green algae can be used as biofertilizers because they are:

1. Photosynthetic

2. Surrounded by mucilage

3. Growing everywhere

4. Can fix atmospheric nitrogen