Explanation

Celestial bodies that do not have their own heat and light are known as planets. Planets are lit by the light of stars, such as our sun.

Stars: Celestial bodies that emit their own light.

Asteroids: Tiny bodies that move around the sun, found between the orbits of Mars and Jupiter.

Comets: Bodies in space that are seen by reflected light.

Explanation

Biodegradable:

Materials that decompose naturally by microorganisms.
Examples: Paper, food waste, leaves.

Non-Biodegradable:

Materials that do not decompose easily or naturally.
Examples: Plastics, metals, synthetic fibers.

Explanation

Explanation

Natural graphite is used in many ways, from making pencils lead, to forming batteries.

The layered structure formed due to rings of carbon atoms present in Graphite makes it slippery and for that reason, it is used in Pencil leads.

Graphite was named by Abraham Gottlob Werner in 1789.

It is an allotrope of carbon.

Graphite is a good conductor of electricity.

Explanation

Explanation

Evaporation happens when a liquid turns into a gas.

It can be easily visualized when rain puddles “disappear” on a hot day or when wet clothes dry in the sun.

In these examples, the liquid water is not actually vanishing—it is evaporating into a gas, called water vapor.

Explanation

Calcium oxalate is the most common compound found in kidney stones.

It forms when excess calcium and oxalate in the urine combine, creating hard crystals that can grow into stones.

Explanation

Explanation

Biology

Life and living organisms, including their structure, function, growth, evolution, and interaction with their environment.

Geology
The Earth, its materials (rocks, minerals), structure, and the processes that shape it (earthquakes, volcanoes, plate tectonics).

Chemistry

Matter, its properties, how it interacts, combines, and changes (chemical reactions, molecular bonds, atomic structure).

Physics:

The fundamental forces and principles of the universe, such as energy, motion, force, and the nature of matter.

Explanation

The small intestine is the longest part of the digestive system.

It extends from the stomach (pylorus) to the large intestine (cecum).

It consists of three parts: duodenum, jejunum and ileum.