Explain biogas plant with a labelled diagram.</h2></div>

The following diagram represents ________

On which of the following factors does the type of gas produced depend?

Which of the following is used as a green manure?</h2></div>

How does yeast make dough rise?</h2></div>

Which of the following is a biofertilizer?</h2></div>

A common biocontrol agent for plant diseases is?</h2></div>

Activated sludge should have the ability to settle quickly so that it can:</h2></div>