14.4 Assertion: As insect resistance of DDT increased, other organic toxins such as Aldrin and Dieldrin were introduced in the market by pesticide industry.

Reason: The repeated use of the same or similar pesticides give rise to pests that are resistant to that group of pesticides thus making the pesticides ineffective.

–I effect ∝ Acidic strength

+I effect ∝ Basic strength

*  Most stable anion due to maximum –I effect.

*  Most acidic

with increase in separation of screen from slits plane, fringe width increases.

Excessive nitrate in drinking water causes methemoglobinemia

Excessive nitrate in drinking water causes methemoglobinemia

Release of toxic/undesirable materials in the environment.