Science 7 MH: 26 MCQs with answers

Cow

Cow is a herbivore because it eats only plants. Lion and dog are carnivores, and human is omnivore.

Photosynthesis

Photosynthesis is the process by which green plants use sunlight, water, and carbon dioxide to produce food.

Copper

Copper is a metal and conducts electricity well. Rubber, plastic, and wood are insulators.

Sun

The Sun is a natural source of light. Others are artificial sources.

Root

Roots absorb water and minerals from the soil and also anchor the plant.

Whale

Whale is a mammal because it breathes air, gives birth to live young, and produces milk. Others are not mammals.

H2O

Water is composed of two hydrogen atoms and one oxygen atom, represented as H2O.

Gravitational force

Gravitational force is the force of attraction between objects and the Earth, pulling them downwards.

Pulses

Pulses are rich in proteins. Rice is carbohydrate, sugar is carbohydrate, oil is fat.

Thermometer

A thermometer measures temperature. Barometer measures pressure, hygrometer measures humidity, ammeter measures current.

True

Metals have free electrons that allow them to conduct electricity well.

Carbon Dioxide

Plants take in carbon dioxide ($CO_2$) from the air during photosynthesis to produce glucose and oxygen.

Sour taste

Acids are known for their sour taste, which is a characteristic property.

To absorb water and nutrients

The primary function of roots is to absorb water and nutrients from the soil.

They grow and develop

All living organisms grow and develop as part of their life cycle.

Na

The chemical symbol for sodium is $Na$, derived from its Latin name 'Natrium'.

Solar energy

Solar energy is renewable because it is derived from the sun, which is inexhaustible.

Evaporation

Evaporation is the process where water transforms from a liquid state to a gaseous state.

Heart

The heart is the organ responsible for pumping blood throughout the body.

To conduct photosynthesis

Leaves are primarily responsible for conducting photosynthesis, where they convert sunlight into energy.

Oxygen

Oxygen is a non-metal, while iron, copper, and gold are metals.

Newton

The SI unit of force is Newton (N). Joule is energy, Watt is power, Pascal is pressure.

Condensation

Condensation is the change of water vapour (gas) into liquid water.

Vegetable peels

Vegetable peels are biodegradable as they can be decomposed by microorganisms. Others are non-biodegradable.

Coal

Coal is a fossil fuel and is non-renewable as it takes millions of years to form. Solar, wind, and water are renewable.

False

Sound travels faster in water than in air because water is denser than air.