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JCE (Botswana) The Biosphere — practice questions

Explore 3 free The Biosphere questions in JCE (Botswana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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The Biosphere questions and exercises with answers

Showing questions 1–3 of 3.

What does the word biosphere mean?Read the answer and worked solution →Which three gases matter most in the layer of air around the Earth?Read the answer and worked solution →The hydrosphere holds all the water on Earth. In which states of matter is that water found?Read the answer and worked solution →

Worked practice questions

What does the word biosphere mean?

  1. Where rocks form under Earth
  2. Where air moves around Earth
  3. Where water flows over Earth
  4. Where life exists on Earth
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Correct answer: D. Where life exists on Earth

1. The prefix bio points to something to do with life. 2. A sphere is a round shape, and here it stands for the whole planet. 3. Put together, the biosphere is the place where life exists on Earth. 4. It takes in the soil and rocks, the water and the air. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), What is the biosphere?_

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Which three gases matter most in the layer of air around the Earth?

  1. Nitrogen, oxygen, carbon dioxide
  2. Nitrogen, helium, carbon dioxide
  3. Hydrogen, oxygen, carbon dioxide
  4. Nitrogen, oxygen, carbon monoxide
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Correct answer: A. Nitrogen, oxygen, carbon dioxide

1. The atmosphere is the layer of gases wrapped around the Earth. 2. Its three most important gases are nitrogen, oxygen and carbon dioxide. 3. Animals need the oxygen and plants need the carbon dioxide. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Atmosphere_

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The hydrosphere holds all the water on Earth. In which states of matter is that water found?

  1. Liquid and gas only
  2. Solid and liquid only
  3. Solid, liquid and gas
  4. The liquid only
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Correct answer: C. Solid, liquid and gas

1. Water in the sea, rivers and rain is in the liquid state. 2. Snow and ice on mountains are the same water in the solid state. 3. Water vapour in the air is that water in the gas state. 4. The hydrosphere covers all of these, so all three states are included. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Hydrosphere_

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