Question

exit ticket - 2 min

1. which of the following processes removes carbon from the air and uses it to make organic compounds?

a. combustion
b. decomposition
c. photosynthesis
d. respiration

1. which of the following are mainly cycled through the processes of photosynthesis & cellular respiration?

a. carbon & sulfur
b. carbon & oxygen
c. nitrogen & sulfur
d. nitrogen & oxygen

Explanation:

1. Photosynthesis: Plants take in \(CO_2\) (carbon - containing) from the air and use it along with water (\(H_2O\)) to make organic compounds (like glucose \(C_6H_{12}O_6\)) in the presence of sunlight. Combustion releases carbon (e.g., \(CO_2\) from burning fossil fuels), decomposition breaks down organic matter (releasing carbon in some cases), and respiration (cellular) releases \(CO_2\) (it is a catabolic process).
2. Carbon & Oxygen: In photosynthesis, \(6CO_2+6H_2O

ightarrow C_6H_{12}O_6 + 6O_2\). In cellular respiration, \(C_6H_{12}O_6+6O_2
ightarrow6CO_2 + 6H_2O\). Sulfur is mainly involved in the sulfur cycle, and nitrogen is cycled through processes like nitrogen fixation, nitrification, etc.

Answer:

1. C. photosynthesis
2. B. carbon & oxygen