Irrigation - Improvement in Food Resources | Class 9 Biology

Cropping Patterns : Mixed Cropping - Improvement in Food Resources | Class 9 Biology

Improvement in Food Resources - NCERT Intext Solutions (Part 1) | Class 9 Biology

Improvement in Food Resources - NCERT Intext Solutions (Part 2) | Class 9 Biology

Air Pollution - Greenhouse Effect | Natural Resources | Class 9 Biology

Water Pollution - Natural Resources | Class 9 Biology

Causes of Water Pollution - Natural Resources | Class 9 Biology

Effects of Water Pollution - Natural Resources | Class 9 Biology

Soil - Natural Resources | Class 9 Biology

Soil Formation (Step 1) - By Sunlight | Natural Resources | Class 9 Biology

Soil Formation (Step 2) - By Water | Natural Resources | Class 9 Biology

Soil Formation (Step 3) - By Wind | Natural Resources | Class 9 Biology

Soil Composition - Natural Resources | Class 9 Biology

Soil Pollution - Natural Resources | Class 9 Biology

Biogeochemical cycle - Natural Resources | Class 9 Biology