Tag: deforestation and conservation

Questions Related to deforestation and conservation

Which of the following is also called unwanted plants?

evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

  1. Weeds

  2. Shrubs

  3. Grasses

  4. Feeds

Show answer
Correct Option: A
Explanation:

Weeds are the unwanted or undesirable plants as they compete with desirable crops in the field for nutrients, sunlight and interfere with the growth of crops.

So, the correct answer is option A.

Herbicides are chemicals which control

evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

  1. Insects

  2. Fungi

  3. Weeds

  4. Nematodes

Show answer
Correct Option: C
Explanation:

Herbicides are chemical which control weeds. These are also called as weedicides. Glufosinate ammonium is a broad spectrum herbicides. A 2,4-D (2,4-Dichlorophenoxyacetic acid) is a plant hormone that acts as herbicide. It kills the broadleaf weeds that harm the plants by causing uncontrolled growth in them.

Thus, the correct answer is option C.

Which of the following chemical/s cannot be used as a weedicide?

evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

  1. Dalapon

  2. Metachlor

  3. 2-4- Dichlorophenoxy-acetic acid.

  4. Colchicine

Show answer
Correct Option: D
Explanation:
A.Dalapon - used as a weedicide
B.Metachlor - used as a weedicide
C.2-4-Dichlorophenoxy acetic acid - used as a weedicide and hormone.
D.Colchicine  - used as a mutagen . It is a mitotic poison, it inhibits spindle formation that results in polyploidy of a cell. This can be detrimental for the major crop. So it isn't used as a weedicide.
So, the correct option is 'Colchicine'.

The best time for removal of weeds is before they produce flowers and seeds.

evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Removal of weed (or weeding) is done before weeds flower because if they flower they will also produce seeds and finally result in the dispersal of the seeds which makes it difficult to control the weeds because each seed will produce a new weed plant.

So the correct option is ' True ' .

Which of the following statement can be related to weed?

evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

  1.  A weed is a plant considered desirable in a particular situation

  2.  A weed is a plant considered undesirable in a particular situation

  3.  A weed is a plant considered undesirable in  all situations.

  4.  A weed is a plant considered desirable in a all situations.

Show answer
Correct Option: B
Explanation:

A weed is a wild plant that grows in an unwanted region and is a competition to cultivated plants. They are also known as invasive plants. Weeds typically produce a large number of seeds and propagate enormously. They are highly competitive, persistent, pernicious and may interfere negatively with human activities. It may have good properties also. But the undesirable properties outweigh the desirable properties at a given place. 

So the correct option is 'A weed is a plant considered undesirable in a particular situation'.

Which of the following effect is not caused due to weeds?

evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

  1. Increased crop field

  2. Interference with harvest

  3. Limit the choice of crop rotation sequences and cultural practices

  4. Serve as hosts for crop diseases or provide shelter for insects

Show answer
Correct Option: A

Farmer is interested in increasing yield of sugarcane by increasing its height which growth hormone would you suggest to achieve his goal?

evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

  1. Auxin

  2. Cytokinin

  3. Gibberellin

  4. ABA

Show answer
Correct Option: A
Explanation:

Auxins have a cardinal role in the coordination of many growths and behavioral processes in the plant's life cycle and are essential for plant body development. So the correct option is ' Auxin'.

Xanthium, Parthenium, Cyperus rotundus are the examples of 

evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

  1. Diseases

  2. Pesticides

  3. Weeds

  4. Pathogens

Show answer
Correct Option: C
Explanation:

Weeds are unwanted plants which grow along with the crop plants in the cultivated field. Some common weeds in India are Amaranthus (Chaulai), Parthenium (Gajar ghas), Cyperus rotundus (Motha), Chenopodium (Bathua), Xanthium (Gokhroo). Weeds compete with the crop plants for nutrients, space, light and water. This results in lowering the food grain quality and reduction in crop yield. Weeds may produce toxic substances which may interfere with crop growth. During harvesting, weeds get mixed up with crops to lower down its quality.

So, the correct answer is 'Weeds'.

The growth of weeds can be controlled by

evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

  1. Manual removal

  2. Irrigation

  3. Herbicides

  4. All of the above

Show answer
Correct Option: D
Explanation:

The growth of weeds can be controlled by the following methods:

(1) Coverings: In domestic gardens, methods of weed control include covering an area of ground with a material that creates a hostile environment for weed growth, known as a weed mat. Several layers of wet newspaper prevent light from reaching plants beneath, which kills them.
(2) Manual removal: Many gardeners still remove weeds by manually pulling them out of the ground, making sure to include the roots that would otherwise allow them to resprout.
(3) Irrigation: Drip irrigation involves bringing water directly to the roots of the desired plants, thereby limits weed's access to water.
(4) Biological pesticide: Vinegar kills the visible part of the weed. They will wrinkle and die the next day, although the root will still be in place to continue growing. 


Therefore, the correct answer is option D.

Weeding is necessary because_______________

evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

  1. They affect growth of the plant

  2. They affect the nutrients supplied to the soil

  3. Both A and B

  4. None of these

Show answer
Correct Option: C
Explanation:

Weeding is necessary since weeds compete with the crop plants for water, nutrients, space and light. Thus, they affect the growth of the crop. Some weeds interfere even in harvesting and may be poisonous for animals and human beings. 

Therefore, the correct answer is the option C.