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Unwanted plants growing along with crop plant are called as
a. Herbs
b. Weeds
c. Crops
d. Grass

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Answer
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Hint: Unwanted plants growing along with crop plants are none of use instead they use the nutrients given to crop plants and reduce their supply to main crop plants. They are commonly known as weeds.

Complete Solution:
Weeds compete for nutrients, sunlight, water and many more things.
Thereby, weed reduces supply to crop plants as a result the crop yield is poor and crop quality is also reduced.
The most common example of weed that increases soil fertility is chickweed. It increases soil fertility and is good for gardening.
Advantages of weed also include repelling the pests and attracting beneficial insects.
Examples of weeds – dandelion, pampas grass.
Weeds are of three types
a. Annuals
b. Biennials
c. Perennial’s
Not all weeds are bad, some weeds are good also because they can be used for utility purposes like for consuming as a food, or for increasing soil fertility.
So, the correct answer is option B

Note: Not all weeds are bad, some weeds are good also because they can be used for utility purposes like for consuming as a food, or for increasing soil fertility.