The correct option is (c) 2 and 3 only.
Explanation
Weeds are undesirable plants that grow naturally along with cultivated crops. They compete with crop plants for essential resources such as water, nutrients, space, and light, thereby affecting the growth and yield of the main crop.
Statement-wise Analysis
- Statement 1 is Incorrect. Weeds are not the primary cultivated plants; rather, they are unwanted plants that grow spontaneously in agricultural fields. Examples include Parthenium (Gajar ghas) and Xanthium.
- Statement 2 is Correct. The removal of weeds is most critical during the early stages of crop growth. If left unchecked during the vegetative phase, they compete severely for resources, leading to poor crop development. Effective weeding is usually required before the weeds produce flowers and seeds.
- Statement 3 is Correct. Cyperus rotundus (commonly known as Motha or Nut grass) is a widespread and persistent weed found in agricultural fields.
Key Takeaway
Weeding is the process of removing unwanted plants (weeds) to prevent competition for nutrients and light, which is essential for ensuring the healthy growth of cultivated crops.