2. (a)Despite favorable climatic conditions, a farmer’s crop failed to give a good yield. Give the possible reasons for this.
(b)What is the right time to spray weedicides?

A farmer’s crop failed to give a good yield due to the following reasons.

1) Nutrients are not sufficient for the crop or nutrients are present in very high amount in the soil which causes toxicity.

2) If proper irrigation is not applied to the field.

3) If the seeds are not of good quality, the yield is also reduced.

The right time to spray weedicides are 30 to 40 days after sowing.

because the light is a great source of energy for the plants to survive. (i hope this )

its temperature is increasing. this causes molecular vibrations to increase.