Explanation

• Ecology is the study of relationships between living organisms and their environment.
• It includes interactions among plants, animals, and surroundings.
• The term was introduced by Ernst Haeckel in 1866.
• It helps in understanding ecosystems and environmental balance.

Last verified on 25-04-2026

Explanation

• The world’s fastest bird is the Peregrine Falcon (Falco peregrinus)
• Reach speed of over 300 km/h (186 mph) during a hunting dive (called a stoop).

Additional information:

Fastest Running Bird: Ostrich (up to 43 mph). 

Last updated by NA on 25-April-2026

Explanation

• Washing soda is also known as sodium carbonate (Na2CO3).
• It is used to remove permanent hardness of water.
• Permanent hardness is caused by the presence of magnesium and calcium sulfates or chlorides in water, which cannot be removed by boiling.
• Washing soda helps to precipitate these minerals, making the water softer.

Last verified on 23-04-2026

Explanation

• Spider legs = 8 total
• Arrangement = 4 pairs
• Insects (like ants, bees) have only 3 pairs (6 legs)

 Last updated NA 12-04-2026

Explanation

• A simple microscope is used to magnify small objects.
• It works by bending light to produce a larger image.
• Only a converging lens can produce a magnified virtual image.
• A convex lens has this property.
• Therefore, simple microscopes use a convex lens.

Last verified on 12-04-2026