Assertion: All pesticides are insecticides.
Reason: Pesticides enrich soil with essential nutrients.

1. If both assertion and reason are true but reason is not the correct explanation of assertion
2. If both assertion and reason are false
3. If both assertion and reason are true and reason is the correct explanation of assertion
4. If assertion is true but reason is false

The correct option is B If both assertion and reason are false

• The chemicals used to eliminate pests are called pesticides.
• Pesticides include insecticides (for killing insects), weedicides (for killing weeds), rodenticides (for killing rats) and fungicides (for killing fungi).
• So, all pesticides are not only insecticides.
• Pesticides do not add any essential nutrients to the soil.
• So, both the assertion and reason are false.