Front

What is the chemical symbol for water?

Back

H2O

Answer explanation

The chemical symbol for water is H2O, which indicates it consists of two hydrogen atoms and one oxygen atom. The other options (H2O2, O2H, H2O3) represent different compounds and are incorrect.

Front

What planet is known as the Red Planet?

Back

Mars

Answer explanation

Mars is known as the Red Planet due to its reddish appearance, which is caused by iron oxide (rust) on its surface. This distinguishes it from other planets like Jupiter, Venus, and Saturn.

Front

What is the process by which plants make their food?

Back

Photosynthesis

Answer explanation

Plants make their food through photosynthesis, a process that uses sunlight, carbon dioxide, and water to produce glucose and oxygen. This is essential for their growth and energy.

Front

What is the powerhouse of the cell?

Back

Mitochondria

Answer explanation

The mitochondria are known as the powerhouse of the cell because they generate ATP, the energy currency of the cell, through cellular respiration. This makes them essential for energy production.

Front

What is the force that pulls objects toward the Earth?

Back

Gravity

Answer explanation

The force that pulls objects toward the Earth is gravity. It is responsible for the ball coming back down after Prisha throws it up, as gravity acts on all objects with mass.

Front

What gas do living beings need to breathe?

Back

Oxygen

Answer explanation

Living beings, including humans, need oxygen to breathe. The plants Aashi and Neha are near likely produce oxygen, which is essential for their comfort while exploring the forest.

Front

What is the smallest unit of life?

Back

cell

Answer explanation

The smallest unit of life is the cell. Cells are the basic building blocks of all living organisms, while organs, tissues, and organisms are made up of multiple cells.

Front

What is the main organ of the circulatory system?

Back

heart

Answer explanation

The heart is the main organ of the circulatory system, responsible for pumping blood throughout the body. The kidneys, lungs, and liver have different functions and are not the primary organs of this system.

Front

What is the speed of light in a vacuum?

Back

299,792,458 meters per second

Answer explanation

The speed of light in a vacuum is precisely 299,792,458 meters per second, making it the fastest speed in the universe. This value is a fundamental constant in physics.

Front

What is the basic unit of matter?

Back

atom

Answer explanation

The basic unit of matter is the atom. Atoms combine to form molecules and compounds, but they are the fundamental building blocks of all matter. Cells are biological units, not basic units of matter.