Tag: conservation of forest and wildlife

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Questions Related to conservation of forest and wildlife

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

American water plant that has become a troublesome water weed in India is

  1. Cyperus rotundus

  2. Eichhornia crassipes

  3. Trapa latifolia

  4. Trapa bispinosa
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Eichhornia crassipes , commonly known as water hyacinth , is an aquatic plant native to Amazon basin, known for it's highly problematic invasion outside it's native range. It forms dense mats in the water bodies, which causes the reduction in the oxygen for other organisms in the water body .

So the correct answer is 'Eichhornia crassipes'

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

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. (i), (iii) and (iv)

  2. (iii) only

  3. (iii) and (iv)

  4. (i), (ii), (iii) and (iv)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Harmful effects of weeds on crop of plant are as follows:
  • They interfere in harvesting.
  • They compete with crop plants for water, nutrients, space and light.
  • They affect plant growth.
  • Presence of weeds increases the cost of agriculture and hinders the progress of work.
  • It increases the irrigation requirement.
  • They reduce the value of produce or otherwise adds the cost of cleaning.
  • Some weeds when eaten (Cleome viscosa) by milch animals will produce an undesirable odour in the milk. At times death/disorder/deformity may occur.  For example, Datura stramonium.
  • The fruits and seeds of Xanthium strumarium and Achyranthes aspera entangle with wool which fetch lower prices.
  • They harbour insect pests, pathogens and parasites.
  • They reduce the value of the land.
  • Presence of weeds will impair the purity of varieties by chance of cross pollination.
  • Weeds cause health hazards to man and animals.
  • Weeds cause allelopathic effect.
Therefore, the correct answer is option A.
Multiple choice evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

Which of the following is a weed?

  1. Oryza sativa

  2. Cyperinus rotundus

  3. Arachis hypogea

  4. Triticum vulgare
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Weeds can be defined as the unwanted plants that are grown in the field and harm the desired crops. Cyperinus is the most invasive weed found throughout the world. It is the weed of rice field. This is the weed which is commonly found in the temperate regions. 

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

The prodigious spread of prickly pear (Opuntia) in South India was controlled by

  1. cochineal insect

  2. colchicine

  3. DDT

  4. 2, 4-D
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the invasive species prickly pear was introduced it possessed a threat to the native species. The growth Opuntia is then controlled by the introduction of the species of the cochineal insect.

This was the biological methods of the plant management.
So, the correct option is 'cochineal insect'

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

'Aquatic' weeds can be utilized and converted into

  1. Ethanol

  2. Fertilizers

  3. Leather

  4. Solid waste
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Aquatic weeds, such as water hyacinth, are rich in organic matter and nutrients. They are commonly harvested and processed into organic fertilizers or compost to improve soil quality.

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

Which of the following groups of herbicides is derived from urea, and is used for controlling weeds in tea, tobacco and cotton?

  1. Carbamates

  2. Triazines

  3. Pyrethroids

  4. Organophosphate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A carbamate is an organic compound which is derived from carbamic acid (NH$ _{2}$COOH). 

A pyrethroid is an organic compound similar to the natural pyrethrins produced by the flowers of pyrethrums (Chrysanthemum cinerariaefolium and C. coccineum). Pyrethroids now constitute the majority of commercial household insecticides. 
An organophosphate or phosphate ester is the general name for esters of phosphoric acid. 
Triazines show antimalarial, antibacterial, and antimicrobial activities. They are derived from urea and used in tea, cotton and tobacco plantation and some orchid plantation. Thus, option B is correct.

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

Weeds affect the crop plants by

  1. Killing the crop plants before they grow

  2. Secreting poisons which cause diseases in crop plants

  3. Competing for various resources of crop plants causing low availability of nutrients

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Weeds are unwanted plants in the cultivated field. They compete with the crop plants for food, space and light. They take up the nutrients and reduce the growth of the  crop.

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

The most important weed against which eradication measures would be taken on war footings is

  1. Eichhornia

  2. Dactylis

  3. Parthenium

  4. Ageratum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Parthenium is most common weed which grows anywhere on the land like roadsides, war footings etc.  It releases chemicals to supress the growth of plants and allergents toxic to other livestock. Thus it is important to supress  this weed first. Thus the correct answer is 'Parthenium'. 

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

The common weedicide used in cultivating fields is 

  1. 2, 4 - D

  2. 2,4,5 - T

  3. IAA

  4. ABA
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Weedicides can be defined as the pesticides used to kill the weeds. Bio-weedicides are called herbicides. Herbicide also commonly known as weedkillers, are pesticides used to kill unwanted plants. 2,4-D (2,4-dichlorophenoxy) is a systemic phenoxy herbicide developed in the 1940s and still in use today. The low cost of 2,4-D has led to continued usage, and it remains one of the most commonly used herbicides in the world.