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

• Law of Inertia = Newton’s First Law of Motion.
• States: “An object at rest stays at rest, and an object in motion continues in the same direction and speed unless acted upon by an unbalanced force.”
• Explains why seat belts are important in cars.
• Applies to all objects on Earth and in space.

Last verified on 13-03-2026

Explanation

• An aqueous solution is one where water acts as the solvent, dissolving the solute.
• This type of solution is common in many chemical reactions and biological processes.

Last verified on 06-03-2026

Explanation

• Hydrogen and helium are the two lightest gases.
• Helium is the second most abundant element in the universe, after hydrogen.
• Helium has monatomic molecules.
• It is the lightest of all gases except hydrogen.
• Hydrogen is the lightest gas known.
• It provides the maximum lift for balloons due to its very low density.

Last updated question 17-02-2026

Explanation

The total percentage of silicon in the Earth's crust is approximately 27.7% by weight.

Additional information

Abundance: Second most abundant by weight (~ 28%) and volume (0.9%).

Occurrence: It does not exist in pure form in nature, but rather as oxides (e.g., sand, quartz) and silicates (e.g., feldspar, mica, clay).

Last updated 14-feb-2026

Explanation

The Earth was formed about 4.5 billion years ago.

Additional information:

• Method Used: Radiometric dating
• Oldest Materials: Meteorites and ancient Earth rocks
• Scientific Consensus: Supported by geology and astronomy

Last verified on 16-01-2026

Explanation

• Sunlight is a good source of vitamin D.
• When our skin is exposed to sunlight, it produces vitamin D, 
• It is essential for bone health, immune function, and the regulation of calcium levels in the blood.
• Deficiency of Vitamin D results in Rickets.

Explanation

Chromosomes are made up of:

• Nucleic acid (DNA or RNA)
• Proteins (histones and non-histone proteins)

A chromosome is made up of proteins and DNA organized into genes.

Each cell normally contains 23 pairs of chromosomes.

Explanation

• Apiculture is the practice of rearing honeybees for honey and wax production.
• Helps in pollination and increasing crop yields.
• Honey, beeswax, and propolis are valuable products from apiculture.

• Sericulture → Rearing of silk worms.
• Silviculture → Cultivation of trees and forests.

Last verified on 30-01-2026

Explanation

• The study of tissues is called Histology.
• It involves examining the structure, composition, and function of cells and tissues under a microscope.
  

Additional information:

• Geology is the study of rocks and Earth's structure.
• Radiology is the study of medical imaging techniques like X-rays and MRI.

Last verified on 22-01-2026