<i>Trichoderma harzianum</i> has proved a useful microorganism for</h2></div>

Presence of which of the following elements is required for nitrogen fixation?

Natural killer(NK) cells can destroy.</h2></div>

Which of the following is not organic waste?

What is the method of controlling pests in agriculture by the organic farmer?

What suggestion will you give a farmer to increase the productivity of his field? Explain.</h2></div>

Citric acid is got from :</h2></div>

Dosa and Idli are preparations of</h2></div>