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

• Leaves are called the food factory of plants.
• They prepare food through the process of Photosynthesis.
• Chlorophyll in leaves absorbs sunlight to make food.
• Photosynthesis uses Carbon dioxide (CO₂), Water (H₂O), and Sunlight.
• Food produced is mainly Glucose, which provides energy to the plant.

Last verified on 13-03-2026

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

• 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

• The sky appears blue due to Rayleigh scattering of sunlight by the atmosphere.
• Shorter wavelengths like blue light scatter more than longer wavelengths (red, yellow).
• The scattered blue light reaches our eyes, making the sky appear blue.
• Red light is less scattered and passes through the atmosphere.

Last verified on 17-03-2026

Explanation

• Blood vessels and capillaries are part of the circulatory system.
• They transport blood throughout the body, ensuring oxygen and nutrients reach tissues.
• Veins specifically carry blood towards the heart, while arteries carry blood away from the heart.
• Capillaries connect arteries and veins and allow exchange of oxygen, nutrients, and waste.

Last verified on 17-03-2026

Explanation

• Air is essential for plants because they need gases from the air for survival and growth.
• Plants take carbon dioxide (CO₂) from the air during photosynthesis to make their food.
• They also use oxygen (O₂) from the air for respiration to release energy.
• Without air, plants cannot perform important life processes.

Last verified on 16-03-2026

Explanation

• Dilution refers to the process of decreasing the concentration of a solution by adding more solvent.
• While ionisation involves the formation of ions from molecules in a solution.

Last verified on 16-03-2026