Ecology

Step 1: Organic farming is a holistic production management system which promotes and enhances agro-ecosystem health.
Step 2: It strictly avoids the use of synthetic inputs such as chemical fertilizers, pesticides, and growth regulators.
Step 3: Instead, it relies on crop rotations, green manures, compost, and biological pest control to maintain soil fertility and plant health.

Step 1: BOD is a measure of the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample.
Step 2: High BOD indicates that the water is highly polluted with organic waste, as microbes are consuming more oxygen to decompose it.
Step 3: It is a key parameter used in sewage treatment and monitoring water quality.