Natural Resources (Class 9 Science)

Natural resources are materials and energy sources that occur naturally on Earth. Soil, air, and water are essential components of the biosphere that suppo

Natural Resources (Class 9 Science)

Natural resources are materials and energy sources that occur naturally on Earth. Soil, air, and water are essential components of the biosphere that suppo

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TL;DR: Natural resources are materials and energy sources that occur naturally on Earth. Soil, air, and water are essential components of the biosphere that…

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Natural resources are materials and energy sources that occur naturally on Earth. Soil, air, and water are essential components of the biosphere that suppo

Natural Resources MCQs with Answers & Explanations

Q1. Which of the following is a renewable resource?

  1. Forests ✓ (correct)
  2. Natural gas
  3. Coal
  4. Petroleum

Explanation: Forests are renewable resources because they can be regenerated through natural growth and replanting, while coal and petroleum are non-renewable.

Q2. The process by which water changes from liquid to gas is called:

  1. Precipitation
  2. Evaporation ✓ (correct)
  3. Sublimation
  4. Condensation

Explanation: Evaporation is the conversion of water from liquid to vapor, which occurs when water absorbs heat energy from the sun.

Q3. Which atmospheric layer is closest to the Earth's surface?

  1. Stratosphere
  2. Thermosphere
  3. Troposphere ✓ (correct)
  4. Mesosphere

Explanation: The troposphere is the lowest atmospheric layer where weather occurs and where most life exists.

Q4. The primary source of energy for all life on Earth is:

  1. Geothermal energy
  2. Nuclear energy
  3. Coal
  4. The sun ✓ (correct)

Explanation: The sun provides energy through radiation that drives photosynthesis, weather systems, and all biological processes.

Q5. Which gas makes up approximately 78% of Earth's atmosphere?

  1. Nitrogen ✓ (correct)
  2. Oxygen
  3. Argon
  4. Carbon dioxide

Explanation: Nitrogen comprises about 78% of Earth's atmosphere, while oxygen is about 21%, and other gases make up about 1%.

Q6. Soil formation occurs through:

  1. Water erosion
  2. Weathering of rocks and accumulation of organic matter ✓ (correct)
  3. Wind erosion
  4. Precipitation only

Explanation: Soil forms through the weathering of parent rock material by physical, chemical, and biological processes combined with organic matter from dead organisms.

Q7. Which of the following is NOT a component of soil?

  1. Mineral particles
  2. Water
  3. Atmospheric pressure ✓ (correct)
  4. Organic matter

Explanation: Soil consists of mineral particles, organic matter (humus), water, and air. Atmospheric pressure is not a component of soil.

Q8. The groundwater table refers to:

  1. The depth of rivers
  2. The atmosphere above ground
  3. The surface of the ocean
  4. The level below which soil is saturated with water ✓ (correct)

Explanation: The groundwater table is the level below which the soil and rocks are saturated with water.

Q9. Which process removes nitrogen from the atmosphere and converts it into a usable form?

  1. Nitrogen fixation ✓ (correct)
  2. Respiration
  3. Photosynthesis
  4. Decomposition

Explanation: Nitrogen fixation by bacteria (in soil or root nodules) converts atmospheric nitrogen (N2) into ammonia (NH3), which plants can use.

Q10. Deforestation leads to all of the following EXCEPT:

  1. Loss of biodiversity
  2. Increased rainfall ✓ (correct)
  3. Soil erosion
  4. Increased atmospheric CO2

Explanation: Deforestation actually reduces rainfall (forests help regulate water cycles), causes soil erosion, loss of biodiversity, and increases atmospheric CO2.

Frequently Asked Questions

What are the three states of water in the water cycle?

Water exists as liquid in oceans and rivers, as solid (ice) in glaciers and poles, and as gas (water vapor) in the atmosphere. These states change through evaporation, condensation, and precipitation.

Why is soil conservation important?

Soil is essential for agriculture, stores water and nutrients, supports plant growth, and acts as a carbon sink. Loss of soil reduces fertility, increases erosion, and threatens food security.

More Class 9 Science MCQs

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