Tag: conservation of forest and wildlife

Questions Related to conservation of forest and wildlife

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

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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.

Which of the following are characteristics of weed?

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

  1. Little or no recognized value in medicine

  2. Rapid growth

  3. Competitive with crops

  4. All of the above

Show answer
Correct Option: D
Explanation:

Any plant not sown in the field by the farmer and grow where it is not wanted is called a weed. 

Characteristics of weeds are as follows:
((1) The weeds seed germinate early and the seedlings grow faster. They being hardy compete with the crop plants and deprive them of light, moisture, and nutrients. 
(2) They flower earlier, run to seed in profusion and mature ahead of the crop. They are, therefore, difficult to control and it may be even impossible to eradicate some weeds completely. 
(4) They are harmful to crops, cattle, and human beings. 
(5) They can survive even under adverse conditions. 
(6) They are prolific and have a very high reproductive capacity. 
(7) The viability of seeds remains intact, even if they are buried deep in the soil. 
(8) The seeds may have special structures like wings, spines, hooks, sticky hairs, etc. on account of which they can be easily disseminated over long distances. 
(9) Many weeds like doob are vegetatively propagated and spread rapidly all over the field even under adverse conditions.

Therefore, the correct answer is option D.

Weeds compete with crops for

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

  1. Soil

  2. Nutrients

  3. Space

  4. Both B and C

Show answer
Correct Option: D
Explanation:

  • A weed can be defined as any plant that requires some form of action to reduce its effect on the economy, the environment, human health, and amenity. 
  • Weeds compete with crops for space, nutrients, water, and light. Smaller, slower-growing seedlings are more susceptible than those that are larger and more vigorous. 

Therefore, the correct answer is option D.