Question

biological control of plant pests is ______.
a. the use of man - made chemicals to control pests
b. using living natural organisms or material for control of plant pests
c. the newest control method
d. a mixture between man - made and natural chemicals

Explanation:

To solve this, we analyze each option:

• Option a: Man - made chemicals are used in chemical control, not biological control. So a is incorrect.
• Option b: Biological control of plant pests is defined as using living natural organisms (like predators, parasites) or their materials to control plant pests. This matches the definition of biological control.
• Option c: Biological control is not necessarily the newest method. There are various pest control methods, and the "newness" is not a defining characteristic of biological control. So c is incorrect.
• Option d: A mixture of man - made and natural chemicals is not biological control. Biological control relies on living organisms or their products, not a chemical mixture. So d is incorrect.

Answer:

b. using living natural organisms or material for control of plant pests