Fertilizers and Its Effects

Q. Phosphate solubiliser is a type of biofertiliser.

1. True
2. False

Q.

Write three differences between manures and fertilizers? [3 MARKS]

Q. Which of the following helps in maintaining soil fertility?

A. Biofertilisers
B. Herbicides
C. Pesticides

1. Only A
2. A and C
3. A, B and C
4. Only B

Q. Choose the correct statements:

(i) Excessive use of chemicals in agriculture is toxic to many plant and animal species.
(ii) Excessive use of chemical fertilisers can cause environmental pollution.
(iii) Chemical fertilisers are used in agriculture to increase the quantity of harvest.

1. Only (i)
2. (ii) and (iii)
3. Only (iii)
4. (i), (ii) and (iii)

Q.

What are manures?

Q.

Are eggshells good for plants?

Q. What are the special properties of manures over artificial fertilizers?

Q. Match the given nutrients with their appropriate uses.

$\begin{array}{cc}\text{Nutrients}& \text{Uses}\\ \text{(i) Potassium}& \text{(a) helps roots to penetrate into the soil}\\ \text{(ii) Phosphorus}& \text{(b) induces new leaves, flowers}\\ \text{(iii) Nitrogen}& \text{(c) provides resistance against pest}\end{array}$

1. i - b, ii - a, iii - c
2. i - a, ii - c, iii - b
3. i- c, ii -b, iii - a
4. i - c, ii - a, iii - b

Q. Why is excess use of fertilisers detrimental for environment?

Q. Cottonseed meal, blood meal, fish emulsion, manure and sewage sludge are examples of:

1. (b) and (c) above
2. Organic fertilisers
3. Chemical fertilisers
4. Artificial fertilisers

Q. Chemical fertilisers have high acid content.

1. True
2. False

Q. Manures and fertilisers do not help in increasing the fertility of the soil.

1. True
2. False

Q. The rate of production of crops become high when using an organic fertiliser.

1. True
2. False

Q. Which of the following is a factor that differentiates fertilisers and manure?

1. Disease resistance
2. Rich in nutrients
3. Crop productivity
4. Water Pollution

Q. Ram wants to enrich soil with nutrients for his plants. Suggest the correct group of plant nutrients he should add that does not cause water pollution.

1. Vermicompost, poultry wastes, green manure
2. NPK fertilizer, green manure, goat droppings
3. Urea, cow dung, NPK fertilizer
4. Bone meal, fish manure, phosphate fertilizer

Q. Choose the correct statements:

(i) Excessive use of chemicals in agriculture is toxic to many plant and animal species.
(ii) Excessive use of chemical fertilisers can cause environmental pollution.
(iii) Chemical fertilisers are used in agriculture to increase the quantity of harvest.

1. Only (iii)
2. (i), (ii) and (iii)
3. Only (i)
4. (ii) and (iii)

Q. Regaring the assertion and reason, select the right option.

Assertion: Use of biofertilizers greatly enhances crop productivity.
Reason: Irrigation is very important in increasing crop productivity.

1. Both the assertion and reason are true and the reason is the correct explanation for the assertion.
2. Both the assertion and reason are true but the reason is not the correct explanation of the assertion.
3. The assertion is true, but the reason is false
4. Both the assertion and reason are false.

Q. Which among the following improves soil fertility and plant growth without causing water pollution?

1. Azotobacter
2. Potassium nitrate
3. Ammonium sulphate
4. Superphosphate

Q. are commercially produced plant nutrients.

1. Fertilisers
2. Pesticides
3. Insecticides