How are photosynthesis and cellular respiration related?
A. Photosynthesis releases energy, while cellular respiration stores
energy.
B. Cellular respiration breaks down glucose, while photosynthesis
produces glucose.
C. Cellular respiration is the process animals use to produce glucose,
while photosynthesis is the process plants use to produce
glucose.
D. Photosynthesis produces water molecules, while cellular
respiration splits water molecules apart
The Correct Answer and Explanation is:
The correct answer is B. Cellular respiration breaks down glucose, while photosynthesis produces glucose.
Explanation
Photosynthesis and cellular respiration are two fundamental biological processes that are interrelated and crucial for the energy dynamics of life on Earth. They represent complementary pathways that support the energy needs of plants, animals, and other organisms.
Photosynthesis occurs in plants, algae, and some bacteria, primarily in the chloroplasts. The process converts carbon dioxide and water into glucose and oxygen, utilizing sunlight as the energy source. The overall equation for photosynthesis can be summarized as:
[
6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2
]
Here, carbon dioxide (CO₂) from the atmosphere and water (H₂O) are transformed into glucose (C₆H₁₂O₆), a sugar that serves as an energy source for the plant, and oxygen (O₂), which is released into the atmosphere as a byproduct.
On the other hand, cellular respiration is the process by which cells break down glucose to extract energy for their metabolic needs. This process occurs in the mitochondria of cells in both plants and animals. The general equation for cellular respiration can be represented as:
[
C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (ATP)}
]
In this reaction, glucose is broken down in the presence of oxygen to produce carbon dioxide and water, releasing energy in the form of adenosine triphosphate (ATP), which cells use for various functions.
The relationship between these two processes can be described as a cycle. The oxygen produced in photosynthesis is used in cellular respiration, while the carbon dioxide generated from cellular respiration is utilized in photosynthesis. Therefore, they are intricately linked in the ecosystem, contributing to the balance of oxygen and carbon dioxide in the atmosphere and supporting the energy flow in biological systems.