Questions

When water is cooled from 4°C to 0°C, its density decreases.

When water cools from 4°C to 0°C, ice crystals begin to form because the water is approaching its freezing point. When water freezes, the water molecules form a lattice that increases the volume. As a result, the density decreases. This is why ice will float on top of water; ice has a lower density than the water.

The main source of organic matter in soil is the plant and animal tissue that decompose at each level of breakdown.

Plants developing in dry conditions are called as xerophytes.

India have the most population of tigers with 70% in the world tiger population.