Tag: deforestation and conservation

Questions Related to deforestation and conservation

World's most problematic aquatic weed is ________________.

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

  1. Azolla

  2. Wolffia

  3. Elchhornia

  4. Trapa

Show answer
Correct Option: C
Explanation:

Eichhornia crassipes (water hyacinth) is the world's most problematic aquatic weed, also called "Terror of Bengal". Because of its very high rate of growth, it can cover the surface of whole water bodies, choke them and cause a threat to other aquatic life forms.

Why you never see cattle or goats browsing on weed Calotropis?

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

  1. The plant produces highly poisonous tannin

  2. The plant produces quinine which is bitter in taste

  3. The plant produces cardiac glycosides

  4. The plant bears prickles

Show answer
Correct Option: C
Explanation:

Prey species have evolved various defenses to lessen the impact depredation. For pant, herbivores are the predators plants have evolved an astonishing verity of morphological and chemical defense against herbivores. Calotropis produces highly see any cattle or goat browsing on this plant. A wide variety of chemical substance that we extract from plants on a commercial scale (nicotine, caffeine, quinine, strychnine, opium, etc.) are produced by them actually as defenses against grazers and browsers. So, the correct answer is 'The plant produces cardiac glycosides'.

The exotic species, which when introduced in India became notorious weed, is

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

  1. Lantana camara

  2. Eichhornia crassipes

  3. Parthenium hysterophorus

  4. all of these.

Show answer
Correct Option: D
Explanation:

Native to South America, Lantana camara was brought to India by the British as ornamental plants, possibly as long as 200 years ago. Forest officials in different parts of the country have watched helplessly as the invasive plant has spread, and efforts to contain it have gone largely in vain.

Eichhornia crassipes, commonly known as common water hyacinth, is an aquatic plant native to the Amazon basin, and is often a highly problematic invasive species outside its native range. It was introduced in Bengal in India because of its beautiful flowers and shapes of leaves, but turned out to be an invasive weed draining oxygen from the water bodies and resulted in death of many fish. Fish is a supplement food in Bengal, and because of the fish scarcity in Bengal caused by Eichhornia, the water hyacinth is also called "Terror of Bengal".
Parthenium hysterophorus is a species of flowering plant in the aster family, Asteraceae. It is native to the American tropics. Parthenium hysterophorus invades disturbed land, including roadsides. It infests pastures and farmland, causing often disastrous loss of yield, as reflected in common names such as famine weed. In some areas, heavy outbreaks have been ubiquitous, affecting livestock and crop production, and human health. As an invader it first appeared as a contaminant in imported wheat. Indian National Congress decided to import wheats from USA. The wheat was of inferior quality and was a controversial one. This weed is equally dangerous for all flora and fauna. It is highly dangerous for humans. It sucks the nutritious substances from soils, thus converting fertile ground into infertile ones.
So the correct option is 'all of these'.

Weeds tend to compete with the crops for _____

evs whose forests? improved methods of agriculture cropping patterns food for all

  1. Food

  2. Space

  3. Light

  4. All of the above

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Correct Option: D

If pests and weeds are not controlled at proper time ______

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

  1. They can destruct the crops so much that most of the crop is lost

  2. They can destruct the crops so much that most of the crop is no effect

  3. They can destruct the crops so much that most of the crop is gain

  4. None of these

Show answer
Correct Option: A

In fact weeds _____

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

  1. Take up all the nutrients

  2. Reduce the growth of crop in various ways

  3. Above both options are correct

  4. None of the above

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Correct Option: C

Removal of weeds from cultivated fields during the early stages _____

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

  1. Crop growth is essential for a good harvest.

  2. Just for spending time

  3. For new crop

  4. None of these

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Correct Option: A

Weeds take up nutrients and ______ the growth of the crop

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

  1. Reduce

  2. Increase

  3. No change occur

  4. None of these

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Correct Option: A

If weeds and pests are not controlled at the appropriate time then ____

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

  1. They can damage the crops so much that most of the crop is lost

  2. They can increase the crops so much that most of the crop is lost

  3. They can damage the crops so much that most of the crop is gain

  4. None of these

Show answer
Correct Option: A

Which of the following groups include only weeds?

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

  1. Parthenium, Xanthium and Cyperinus

  2. Xanthium, Parthenium and Maize

  3. Convolvulus, Balsam and Paddy

  4. Amaranthus, Convolvulus and Chenopodium

Show answer
Correct Option: A
Explanation:

Weeds can be defined as the unwanted plants that grow in the field and harm the desired crops. Parthenium is the flowering plant which can cause an allergy is the most important weed of corn and wheat field. Xanthium is the ruderal weed of maize. Cyperinus is the most invasive weed found throughout the world. It is the weed of rice field.