Fertilisers and Insecticides

Q.

Why do plants need nitrogen? How do plants obtain nitrogen?

Q.

What do you mean by organic farming?

Q.

Which of the following is not true for fertilizers?

1. They increase the yield.

2. Their excessive use disturbs the balance of nutrients in the soil.

3. They are generally used in small quantity

4. They are environment-friendly

Q.

Name two potassic fertilizers.

Q.

Solution containing Azotobacter and artificial nitrogenase is used in organic farming.

1. True
2. False

Q.

Which one is nutrient specific, fertilizer or manure?

Q.

How is nitrogen utilized by living organisms?

Q. List any two advantages and two disadvantages of using chemical fertilizers.

Q. What are fertilizers ? Why are they needed ? What do you mean by NPK fertilizers ?

Q.

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation?

1. Nodules act as sites for nitrogen fixation

2. The enzyme nitrogenase catalyzes the conversion of atmospheric N₂ to NH₃

3. Leghaemoglobin scavenges oxygen and is pinkish in color

4. Nitrogenase is insensitive to oxygen

Q.

Classify fertilizers according to the nutrients they supply to plants.

Q.

How the molecular nitrogen is converted into nitrates and nitrites?

Q.

Which of the following can be used as manure for plants?

1. Laboratory waste

2. Electronic waste

3. Industrial waste

4. Kitchen waste

Q. Tick the correct statements from the options given below.

1. Long term use of fertilisers can lead to their accumulation in our body.
2. Fertilisers are naturally available in the environment.
3. Fertilisers are mainly rich in N, P and K.

Q. How fertiliser can pollute environment?

1. Fertilisers are not biodegradable so retained in the atmosphere
2. Fertilisers biomagnify
3. Fertilisers have very harmful effect on organisms
4. All of the above

Q. Pesticides and insecticides are the only ways to prevent damage from pests.

1. False
2. True

Q. The first biocide used on a large scale was

1. Bordeaux mixture
2. Thurioside
3. DDT
4. Benzene hexachloride

Q. Organic farming, a recently adopted method to minimise the use of pesticide, includes

1. No disruption to local ecosystem
2. Procuring sustained yield at low costs
3. Adoption of intercropping and crop rotation
4. All of the above

Q. are commercially produced plant nutrients.

1. Fertilisers
2. Pesticides
3. Insecticides

Q. Organic farming does not include

1. Green manure
2. Chemical fertilizer
3. Crop rotation
4. Compost and farmyard manure

Q.

No	Type of pesticide	No	Target pest
A	Avicides	a	Snails
B	Herbicides	b	Birds
C	Molluscicides	c	Insects
D	Insecticides	d	Plant

1. a, b, c, d

2. b, d, a, c

3. d, a, b, c

4. a, d, b, c

Q. The percentage of nitrogen content in urea is

1. 36%
2. 26%
3. 56%
4. 46%

Q.

Nitrogen is required by plants for the synthesis of ____

Q. does nitrogen fixation yield energy or food to the nitrogen fixing bacteria?

Q. Continuous use of chemical fertilisers can turn the soil ________.

1. nutrient rich
2. fertile
3. infertile
4. porous

Q. Which among the following plant is used as a biofertiliser?

1. Rhizobium
2. Azotobacter
3. Azolla
4. Nostoc

Q. Choose the correct pair.

1. Salting
2. Neel kranti
3. 2016
4. Food processing
5. Weeds
6. Herbicides
7. Fish sauce
8. Vitamin B-12

Q.

Organic farming does not include:

1. Green manure

2. Compost and farmyard manures

3. Chemical fertilizers

4. Crop rotation