Explanation

Earth's Rotation 

• - Sidereal Day: Approximately 23 hours, 56 minutes, 4 seconds.
• - Meaning: The time Earth takes to rotate once relative to distant stars.
• - Solar Day: Approximately 24 hours, measured from one noon to the next.
• - Difference: About 4 minutes.

Last updated 08 Nov 2026 by NA

Explanation

• The poles experience six months of the day and six months of the night.
• This is since earth is tilted on its axis.
• Also, due to this, each pole is tilted towards and away from the sun for about six months.
• When the North Pole is tilted towards the sun, it has continuous daylight.

Last updated 08 Nov 2026 by NA

Explanation

• Photosynthesis is the process by which green plants convert light energy into chemical energy stored in glucose.
• It takes place mainly in the chloroplasts, which contain the green pigment chlorophyll.
• Carbon dioxide and water are used to produce glucose, and oxygen is released as a by-product.

Last verified on 08-11-2026

Explanation

• Chromosomes are present in the nucleus of eukaryotic cells.
• They are thread-like structures made of DNA and proteins.
• They carry genetic information.
• They help ensure the accurate distribution of genetic material during cell division.

Last verified on 01-10-2026

Explanation

• Viruses are non-cellular and obligate intracellular parasites.
• They cannot carry out life processes or reproduce without a living host cell.
• Viruses contain either DNA or RNA.
• They are considered to be at the boundary between living and non-living.
• The branch of science that studies viruses is called Virology.

Last verified on 27-07-2026

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

• The majority of nutrient absorption in the digestive system occurs in the small intestine,
• Where the final stages of digestion take place.
• This organ's structure, featuring villi and microvilli, creates a large surface area optimized for absorbing digested nutrients and most water into the bloodstream.

Last verified on 08-11-2026

Explanation

• Enzymes are biological catalysts that speed up chemical reactions in living organisms without being consumed.
• They are mainly made of proteins.
• They are highly specific to their reactions.

Additional information:

• Some enzymes require cofactors like vitamins or metal ions to function.
• Examples: Amylase (breaks starch), Lipase (breaks fats), Protease (breaks proteins).

Last verified on 11-02-2026

Explanation

• Diffusion is the process where particles move from an area of high concentration to low concentration.
• Ink spreads evenly in water due to molecular motion, resulting in uniform distribution.

Last verified on 08-11-2026

Explanation

• Sunlight provides the energy required for photosynthesis.
• Chlorophyll in plant leaves absorbs light energy, which is used to convert carbon dioxide and water into glucose.
• Oxygen is released as a by-product of photosynthesis.
• Plants are called producers because they prepare their own food using sunlight.

Last verified on 08-11-2026