Mechanical Weeding

Q.

What are weedicides? Give examples.

Q.

What is the importance of weeding?

Q.

Do weedicides have any effect on the person handling the weedicide sprayer

Q. What are weedicides? Give two examples. [2 MARKS]

Q.

Chemicals used to control weeds are:

1. Pesticides

2. Herbicides

3. Weedicides

4. Germicides

Q. What do you understand by weeding ? List the disadvantages of weeding

Name the implements listed below.
[3 MARKS]

Q.

The undesirable plants growing in crop field are called crop.

1. True

2. False

Q. If the weedicides are poisonous to the farmers are they also poisonous to the useful crops?

Q. Write a paragraph in your own words on threshing.

Q.

Chemicals used to control weeds are ___ .

1. All of these

2. Herbicides

3. Weedicides

4. Pesticides

Q.

Discuss various methods for weed control.

Q.

Xanthium and Parthenium are commonly known as:

Q.

A high concentration of synthetic auxin is generally used for

1. Weed control

2. enhancing root initiation

3. controlling of cell enlargement

4. preventing the growth of lateral buds.

Q.

Chemicals that are used to control weeds are called__________________ .

Q.

Why should care be taken while using weedicides? Suggest steps to prevent contamination. [5 MARKS]

Q. I am a plant. I grow in crop fields. Farmers pluck me. I do not know the reason. Can you tell who am I?

Q. Given below are statements about the harmful effects of weeds on crop plants.
(i) They interfere while harvesting.
(ii) They help crop plants grow healthily.
(iii) They compete with crop plants for water, nutrients, space, and light.
(iv) They affect plant growth.
Choose the correct statements from above.

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

Q.

Question 8
Given below are statements about the harmful effects of weeds on crop plants.
(i) They interfere in harvesting.
(ii) They help crop plants to grow healthily.
(iii) They compete with crop plants for water, nutrients, space and light.
(iv) They affect plant growth.

Choose the correct combination of statements.
(a) i, iii, iv
(b) iii only
(c) iii, iv
(d) i, ii, iii, iv

Q. is a tool that is used by farmers to sow seeds and remove weeds.

1. Thresher
2. Seed drill
3. Harvester

Q. By spraying weedicides, weeds are killed, but not the crop plants why?

Q. Discuss two methods of weeding in which poisonous chemicals are not used.

Q. Which of the following tool helps in uniform distribution of seeds while sowing?

1. Sprinkler
2. Grinder
3. Seed drill
4. Thresher

Q. Which of the following tool helps in uniform distribution of seeds while sowing?

1. Sprinkler
2. Grinder
3. Seed drill
4. Thresher

Q.

Question 28
Given below is a conversation between two farmers Heera and Beera.
Heera : Brother Beera, your maize crops looks beautiful! They have grown pretty fast.
Beera : Yes, I have sprayed urea this time. What about you?
Heera : Well, I am still relying on good old cow dung. I am saving money for buying a tractor.
Beera : That’s good. Tractor saves a lot of time and labour.
Heera : Yes, it’s been very labour intensive for me and now these weeds have come up.
Beera : Try weedicides, they are very effective.
Now answer the following questions.
(i) List the practices which are not environment friendly and why?
(ii) What is the advantage of modern agriculture implements over traditional ones?
(iii) Name one weedicide and the precaution farmers must take during its application.

Q. The growth of weeds can be controlled by

1. All of the above
2. Irrigation
3. Herbicides
4. Manual removal

Q. Weeds can be removed by using:

1. Weedicides
2. Pesticides
3. Insecticides
4. Antibiotics

Q. _____________ is the removal of unwanted plants growing along with the crops.

1. Ploughing
2. Sowing
3. Weeding
4. Levelling

Q. Unwanted plants growing along with crop plants are called as ________.

1. Herbs
2. Weeds
3. Crops
4. Grass

Q. Which of the following is not an organic method used to control weeds?

1. Seedling bed
2. Weedicides
3. Intercropping
4. Crop rotation

Q. How do the weeds affect the crops?