Explanation

• Sublimation is the process where a solid changes directly into gas without passing through the liquid state.
• It is used to purify solids that can vaporize easily, leaving impurities behind.
• Common examples include iodine, camphor, and naphthalene.

Last verified on 18-03-2026

Explanation

• A mixture contains two or more substances physically combined, which can be separated by physical means.
• Examples include sharbat, tea, steel.
• Common salt (NaCl) is a pure compound, not a mixture.

Last verified on 18-03-2026

Explanation

• Animal cells do not have chloroplasts, as they are not capable of photosynthesis.
• Animal cells also do not have a cell wall, unlike plant cells and some other organisms.

The components of an animal cell:

• Cell Membrane
• Cytoplasm
• Small Vacuole
• Nucleus
• Chromosomes

Last verified on 18-03-2026

Explanation

• Flowers are the reproductive structures of plants.
• It is responsible for producing seeds and facilitating sexual reproduction.
• They contain the male and female reproductive organs.
• They are essential for the production of fruits and seeds.

Last verified on 18-03-2026

Explanation

• Chlorophyll is the green pigment responsible for photosynthesis in plants.
• It captures sunlight and converts it into chemical energy to make food.

• Plants use chlorophyll to produce glucose and oxygen through photosynthesis.
• Chloroplasts contain chlorophyll a and b, which absorb sunlight.

Last verified on 22-01-2026

Explanation

• Stars produce energy by combining lighter nuclei into heavier nuclei in their cores.
• In the core of a star, hydrogen nuclei fuse to form helium.
• This process releases a huge amount of energy in the form of light and heat.
• It is the primary source of a star’s energy and sustains its radiation for billions of years.

Last verified on 17-03-2026

Explanation

• Leaves have thin veins called vascular bundles.
• Veins consist of xylem and phloem for transport.
• Xylem transports water and minerals from roots to leaves.
• Phloem transports food (sugars) from leaves to other parts of the plant.

Last verified on 17-03-2026

Explanation

• Phosphorus (P), Potassium (K), and Nitrogen (N) are three essential macronutrients for plant growth.
• It is also referred to as "NPK".
• They play critical roles in various plant processes, including photosynthesis, root development, and cell growth.

Last verified on 17-03-2026

Explanation

• A permanent magnet retains its magnetism for a long time.
• It is hard to magnetize but difficult to demagnetize once magnetized.
• Made from hard magnetic materials like steel or alnico.
• Unlike temporary magnets, it does not lose its magnetism easily.

Last verified on 17-03-2026

Explanation

• The velocity of a wave depends on its wavelength and frequency.
• Formula: v = λ × f, where λ is wavelength and f is frequency.
• This applies to sound waves, light waves, and water waves.
• Higher frequency or longer wavelength increases the wave’s velocity if the medium is constant.

Last verified on 17-03-2026