Explanation

Electric fire alarms often use the principle of expansion, where materials expand when heated due to a fire, triggering the alarm.

As the temperature rises during a fire, the metal or bimetallic strips in the alarm expand, activating the electrical circuit to sound the alarm.

Explanation

Methyl orange is a pH indicator that turns yellow in alkaline solutions.

In acidic solutions, it appears red, but in basic or alkaline solutions, it changes to yellow.

Explanation

DNA is the fundamental molecule that carries genetic information, forming the basis of heredity alongside chromosomes and genes.

It is the hereditary material in almost all organisms, encoding the instructions for building proteins and other important molecules.

Explanation

The solar energy that reaches the Earth annually is far more than the world's total energy consumption, with estimates suggesting it is more than 10,000 times the current global energy needs.

This vast amount of energy highlights the potential of solar power as a renewable energy source.

Explanation

Owls have an exceptional hearing range, typically between 200 Hz and 12,000 Hz.

This range helps them detect high-frequency sounds, crucial for locating prey in low light conditions.

Explanation

Potassium is an essential nutrient for plants, helping with growth, disease resistance, and water regulation.

Along with nitrogen and phosphorus, it is one of the primary macronutrients needed for healthy plant development.

Explanation

Our Sun formed about 4.57 billion years ago from a cloud of gas and dust known as a solar nebula.

This process eventually led to the formation of the entire solar system.

Explanation

Irregular galaxies have no fixed shape or structure.

They often appear chaotic and lack the symmetry of spiral or elliptical galaxies.

Explanation

Explanation

Polymerization is the process where small molecules (monomers) repeatedly bond to form large molecules (polymers).

It's commonly used in making plastics, synthetic fibers, and resins.