Question

Weeds affect the crop plants by

• A. killing of plants in field before they grow
• B. dominating the plants to grow
• C. competing various resources of crops (plants) causing low availability of nutrients
• D. all of the above

Answer 1

The correct option is C

competing various resources of crops (plants) causing low availability of nutrients

The correct option is C.

Explanation of correct option:

1. The unwanted plants that grow in the crop fields along with the main crop are known as weeds.
2. They are strong and dominating competitors for the crop plants.
3. They have copious seed production, quick population establishment and can adapt characteristics.
4. Due to this weeds can survive for long time.
5. They fight for essential components of the crops like light, water, nutrients, space, etc. and take up these essential components.
6. They can also cause diseases to the crop plants.
7. Removal of weeds from the field can be done by weeding and spraying weedicides.
8. Weeding is a pre-harvesting process to protect props and their production.
9. Weeds must be removed to avoid a decrease in crop yield.
10. Examples of weeds: Bindweed, Barley hare, etc.

Explanation of incorrect options:

Option A:

Weeds do not affect the crop plants by killing of plants in field before they grow.

Option B:

Weeds affect the crop plants by dominating the plants to grow.

Option D:

Weeds extract more nutrients and other resources making it unavailable for crops.

Final answer: Weeds affect the crop plants by competing various resources of crops (plants) causing low availability of nutrients.