Question

question 32 (1 point)
what is the main purpose of cellular respiration?
to absorb water and minerals
b to break down food molecules and release energy
c to store energy as light
d to create glucose from sunlight
question 33 (1 point)
how does carbon enter the atmosphere?
through the absorption of co, by oceans
b through photosynthesis in plants
c through decomposition only
d through cellular respiration in organisms

Explanation:

• Question 32: Cellular respiration is a metabolic process. In this process, cells break down glucose (food molecule) in the presence of oxygen. The chemical energy stored in glucose is released. This released energy is used to produce ATP (adenosine tri - phosphate), which is the energy currency of the cell.
• Question 33:
• Option a: Absorption of \(CO_2\) by oceans removes carbon from the atmosphere.
• Option b: Photosynthesis in plants takes in \(CO_2\) from the atmosphere and uses it to make glucose. So, it does not add carbon to the atmosphere.
• Option c: Decomposition is one way carbon enters the atmosphere (as \(CO_2\) when organic matter is broken down), but it is not the only way.
• Option d: In cellular respiration, organisms (both plants and animals) break down glucose. The chemical equation for aerobic cellular respiration is \(C_6H_{12}O_6+6O_2

ightarrow6CO_2 + 6H_2O+\text{Energy}\). So, carbon (in the form of \(CO_2\)) is released into the atmosphere.

Answer:

• Question 32: B. To break down food molecules and release energy
• Question 33: D. Through cellular respiration in organisms