In the carbon cycle, which natural biological process removes carbon dioxide directly from the atmosphere?
Answer and explanation
Correct answer: C. Photosynthesis
- Step 1: Green autotrophic plants absorb atmospheric CO2 through stomata to synthesize organic carbohydrates. Step 2. Photosynthesis is the principal natural sink that extracts gaseous carbon dioxide from the atmosphere. Answer: Photosynthesis. Why not the others: Respiration releases CO2; combustion of fossil fuels releases CO2; decomposition of organic matter releases CO2.
Practise more Cycles, Energy, Machines and Forces.
Free questions with an explanation for every one, and full timed Basic Education Certificate Examination mock tests.
More Cycles, Energy, Machines and Forces questions
- Which step in the hydrological (water) cycle involves the loss of water vapour from plant leaves into the atmosphere?
- What term describes the continuous process by which liquid water changes into invisible water vapour at ambient temperatures?
- Which group of soil microorganisms converts atmospheric nitrogen into nitrogenous compounds usable by plants?
- What form of potential energy is stored in the chemical bonds of firewood, food, and petroleum fuels?
- What is the energy conversion that takes place when an electric blender is plugged in and switched on?
- By which primary mechanism is thermal heat transferred along a solid metal rod from the heated end to the cooler end?