Compost and Vermicompost

Q. Question 32
Differentiate between compost and vermicompost?

Q.

Question 37
Define
(i) Vermicompost
(ii) Green manure
(iii) Bio fertilizer

Q.

Question 8
Find out the correct sentence about manure

(i) Manure contains large quantities of organic matter and small quantities of nutrients.

(ii) It increases the water holding capacity of sandy soil.

(iii) It helps in draining out of excess of water from clayey soil.

(iv) Its excessive use pollutes environment because it is made of animal excretory waste.

(a) (i) and (iii)
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (iii) and (iv)

Q.

The process of nitrogen-fixation by bacteria does not take place in the presence of:

1. Molecular form of hydrogen

2. The elemental form of oxygen

3. Water

4. Elemental form of nitrogen

Q. Beera, wants to practice crop rotation in his field. Suggest a Rabi crop and a Kharif crop which will replenish his field with nitrogen. Which crop replenishes nitrogen and why?

Q. What are the advantages and disadvantages of crop rotation ?

Q.

Give the names of a few organisms that help in nitrogen fixation.

Q.

Which of the following combination of crop will give maximum yield in mixed cropping?

1. Oat + Rice

2. Wheat + millet

3. Wheat + peanut

4. Wheat + maize

Q.

Rhizobium helps in fixation of atmospheric nitrogen into ammonia.

1. True

2. False

Q.

What type of organism carries out nitrogen fixation? (Fill in the blank)
___.

Q. Direction: Choose the correct option:
Assertion (A): Crop rotation is a part of sustainable agricultural practice.
Reason (R): Crop rotation helps in maintaining the soil fertility.

1. Both assertion(A) and reason(R) are true, but reason(R) is not the correct explanation for assertion.
2. Assertion(A) is true and reason(R) is false.
3. Assertion(A) is false and reason(R) is false.
4. Both assertion(A) and reason(R) are true and reason(R) is the correct explanation for assertion(A).

Q.

What are detritivores? Name any one of them.

Q.

Explain the mechanism of compost formation.

Q.

Question 9
The nitrogen molecules present in air can be converted into nitrates and nitrites by:

(a) a biological process of nitrogen-fixing bacteria present in the soil
(b) a biological process of carbon fixing factor present in the soil
(c) any of the industries manufacturing nitrogenous compounds
(d) the plants used as cereal crops in the field

Q. a) Difference between mixed cropping and intercropping
b) difference between manure and fertilizers.

Q.

Which of the following are ammonifying bacteria?

1. Thiobacillus

2. Bacillus ramosus

3. Nitrosomonas

4. Nitrobacter

Q. Which is the best method to dispose off biological wastes from hospitals ?

1. Incineration
2. Recycling
3. Composting
4. Landfill

Q. is prepared with the help of earthworms.

1. Compost
2. Vermicompost
3. Green manure

Q.

What are nitrogen fixers? [2 MARKS]

Q. Nitrogen fixing bacteria are present on root nodules of leguminous plants to fix nitrogen.

1. True
2. False

Q.

Choose the correct option

Assertion (A): Inter-cropping increases the productivity of agricultural land.

Reason (R): Same fertilizer and pesticides can be used for different varieties of crops.

1. Both A and R are true and R is the correct explanation of A.

2. Both A and R are true, but R is not the correct explanation of A.

3. A is true but R is false.

4. A is false but R is true.

Q.

Question 37
Define
(i) Vermicompost
(ii) Green manure
(iii) Bio fertilizer

Q. Question 37
Define
(i) Vermicompost
(ii) Green manure
(iii) Bio fertilizer

Q. Question 9
The nitrogen molecules present in air can be converted into nitrates and nitrites by

(a) a biological process of nitrogen fixing bacteria present in soil
(b) a biological process of carbon fixing factor present in soil
(c) any of the industries manufacturing nitrogenous compounds
(d) the plants used as cereal crops in field

Q.

Question 1
Compare the use of manure and fertilizers in maintaining soil fertility.

Q. What is Rhizobium? How is it useful?

Q.

State whether the following statements are true or false. If false, rewrite the statement by changing the incorrect word/ words.

The roots of leguminous plants contain Clostridium.

1. True
2. False

Q. Which among the following fixes atmospheric nitrogen into the soil?

1. Rhizobium leguminosarum
   
2. Chlamydomonas reinhardtii
   
3. Lactobacillus acidophilus
4. Spirogyra
   

Q. Which of the following can help in enriching the fertility of the soil?

1. Reuse of land
2. Crop rotation
3. Tilling
4. Cutting of trees

Q. Which of the following is called a detritivore ?

1. An animal feeding on another animal
2. A plant feeding on a animal
3. An animal feeding on dead organic material
4. An animal feeding on a plant