Question

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.
A) (i), (iii) and (iv)
B) (iii) only
C) (iii) and (iv)
D) (i), (ii), (iii) and (iv)

Answer 1

A weed is a plant considered undesirable in a particular situation, "a plant in the wrong place". But as commercial formation is considered, weeds are small plant species which prevent the most growth of crops, through competing for nutrients, light, and moisture.

Complete answer:
Weeds are usually plants that were never meant to be planted. In a technical sense, a tomato developing in a rice area can be viewed as a weed. But as some distance as farming is involved weeds are flora that grow along with crops.

These vegetation have a tendency to prevent the boom of the supposed vegetation with the aid of absorbing the nutrients, moisture, and even develop large and create shade over the flowers preventing sunlight.

This is a major subject for the farmer as his profits depend on the most growth of the crops. Some characteristics of weeds include rapid growth, no diagnosed industrial value, competitive growth, poisonous, etc. Some weed species may appeal to pests ensures that weeds develop quicker than the plants and take up treasured vitamins from the soil.

Some harmful effects of weeds:
i) Weeds interfere in harvesting.
ii) Weeds compete with crop plants for water, nutrients, space and light and also affect plant growth.
iii) Presence of weeds increases the cost of agriculture and hinders the progress of work.
iv) It increases the irrigation requirement.

Therefore the correct answer is option ‘A’.

Note: Weeds are typically tough to eradicate and require excessive doses of herbicides and other weed elimination processes. But some weeds can't be totally removed and farmers employ different strategies to expand their crop yield. Weeds have no business cost and grow unexpectedly and compete for nutrients such as fertilizers.