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  - Botany Plant Biology
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9th Grade Biosphere Quizzes, Questions & Answers

9th Grade

Top Trending Biosphere Quizzes

Green Earth: Carbon Cycle and Photosynthesis Quiz

Connect biological processes to the global climate in this carbon cycle and photosynthesis quiz. Understand how producers act as "carbon sinks," pulling $CO_2$ from the atmosphere to build biomass, and how this...

Questions: 15 | Attempts: 19 | Last updated: Mar 8, 2026

Sample Question 1
How do photoautotrophs influence the atmosphere through the carbon cycle?

By releasing methane

By sequestering carbon dioxide

By depleting oxygen levels

By increasing nitrogen

Sample Question 2
Which chemical equation represents the primary process of carbon entry into the biosphere?

6CO2 + 6H2O → C6H12O6 + 6O2

C6H12O6 + 6O2 → 6CO2 + 6H2O

CO2 + H2O → H2CO3

CH4 + 2O2 → CO2 + 2H2O

Sample Question 3
The total mass of carbon on Earth is significantly reduced when plants perform photosynthesis.

True

False

9th Grade Biosphere Quizzes, Questions & Answers

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