Questions

China shares land borders with 14 different countries, the longest being with Mongolia followed by Russia and then India.

The first electric train of India was opened in 1925. The first electric train ran between Bombay (Victoria Terminus) and Kurla, a distance of 16 km.

Photosynthesis is the process that converts solar energy into chemical energy. During the stage of light-dependent reactions involving photosystems I and II in photosynthesis, O2 produced.

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.

Oxygen released during photosynthesis comes from splitting of water.

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