What is meant by the term biopesticide? Name and explain the mode of action of a popular biopesticides.

Explanation

**Step-by-Step Text Solution:**

**Step 1: Define Biopesticides**
Biopesticides are defined as biological agents used to control pests that affect crops. They are derived from natural materials such as animals, plants, bacteria, and certain minerals. Unlike chemical pesticides, biopesticides are generally considered to be environmentally friendly and less harmful to non-target organisms.

**Step 2: Identify a Popular Biopesticide**
One of the most popular biopesticides is the BT toxin, which is derived from the bacterium *Bacillus thuringiensis*.

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