Explanation

Tensile strength refers to a material’s ability to resist being pulled apart.

Bones have collagen fibers that provide high tensile strength.

This allows bones to withstand forces that try to stretch or bend them.

Explanation

Christiaan Huygens (1629–1695) proposed the wave theory of light.

He suggested that light travels in the form of waves, not particles.

Huygens’ principle explains how light waves propagate, reflect, and refract.

This theory challenged Newton’s particle theory of light.

Explanation

A covalent bond is formed when two atoms share one or more pairs of electrons.

This sharing creates a strong bond between the atoms, holding molecules together.

Explanation

Bees must collect nectar from approximately 2 million flowers to make 1 pound of honey.

This immense effort requires bees to fly roughly 55,000 to 90,000 miles

A honey bee visits 50 to 100 flowers during a single,, dedicated collection trip.

Production Context: It takes approximately 556 worker bees to gather enough nectar for 1 pound of honey. 

Explanation

Collagen is a structural protein that forms strong fibers in bones.

It provides tensile strength and flexibility, preventing bones from breaking easily.

Collagen works together with calcium phosphate to maintain bone rigidity.

Loss of collagen with age can lead to brittle bones and osteoporosis.

Explanation

Infiltration is the process by which water enters the soil from the surface.

It helps replenish groundwater and maintain soil moisture.

Additional information 

Percolation is the downward movement of water through soil layers.

Evaporation is the conversion of water into vapor, and transpiration is water loss from plants.

Explanation

An ecosystem develops through a series of successional stages.

The final, stable stage is called the climax community.

It is characterized by a balanced and self-sustaining ecosystem.

Explanation

The main purpose of cellular respiration is to convert chemical energy stored in nutrients (specifically glucose) into ATP (adenosine triphosphate),

They acts as the usable energy currency for cellular processes.

It breaks down glucose in the presence of oxygen to produce ATP, carbon dioxide, and water. 

Explanation

• A toxin is a poison produced naturally by a plant.
• It protects the plant from herbivores and pathogens.

Additional information:

• Examples of toxic plants: Ricinus (Castor), Nerium (Oleander), Datura, Aconitum, Foxglove

Last verified on 25-01-2026

Explanation

Cellular activities require energy to function, which comes from molecules like ATP.

ATP (adenosine triphosphate) stores energy in its phosphate bonds.

When a phosphate bond is broken, energy is released for cellular processes.

This energy powers activities like muscle contraction, nerve signaling, and biosynthesis.

Therefore, phosphate bonds are the primary source of energy in metabolism.