Olympiad Test: Sun - 1 - Class 6 MCQ

The Sun provides energy that supports all forms of life. Plants use sunlight for photosynthesis, animals depend on plants directly or indirectly, and humans use solar energy in various ways.

In photosynthesis, plants use sunlight, carbon dioxide, and water to make food (glucose) and release oxygen, making them the primary producers in the food chain.

The Sun provides light and heat, also called solar radiation. These are the primary forms of energy reaching Earth, driving climate, weather, and biological processes.

Solar energy is directly harnessed from sunlight. Wind is generated due to uneven heating of the Earth’s surface, and the water cycle (supporting hydroelectricity) is powered by solar heat.

In the Sun’s core, hydrogen atoms fuse to form helium, releasing enormous amounts of energy in the form of heat and light. This is called nuclear fusion.

The Sun has been shining for about 4.5 billion years and will continue to shine for billions more, making it a sustainable and renewable energy source for Earth.

A solar cooker uses sunlight directly to cook food, converting solar radiation into heat energy.

The Sun’s heat evaporates water from oceans, lakes, and rivers, turning it into vapor. This drives the water cycle and keeps water moving on Earth.

Uneven heating of the Earth by the Sun creates winds, influences rainfall, and regulates temperatures, thus controlling weather and climate patterns.

Without the Sun, there would be no light, no heat, no photosynthesis, and no food chain. Earth would become frozen and lifeless.