Multiple Choice
In most food chains, all of the energy originally comes from:
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9. Photosynthesis
Introduction to Photosynthesis
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Photosynthesis is important to living organisms because it is:
A
the breakdown of glucose to release energy in the absence of oxygen
B
the process by which light energy is converted into chemical energy in the form of glucose
C
the movement of water across a selectively permeable membrane
D
the process by which cells divide to produce identical daughter cells
Verified step by step guidance1
Understand the definition of photosynthesis: Photosynthesis is the process by which light energy from the sun is converted into chemical energy stored in glucose molecules. This process occurs in plants, algae, and some bacteria.
Identify the key components of photosynthesis: The process requires light energy, carbon dioxide (CO₂), and water (H₂O). The products of photosynthesis are glucose (C₆H₁₂O₆) and oxygen (O₂).
Eliminate incorrect options: (1) The breakdown of glucose to release energy in the absence of oxygen refers to anaerobic respiration, not photosynthesis. (2) The movement of water across a selectively permeable membrane is osmosis, unrelated to photosynthesis. (3) The process by which cells divide to produce identical daughter cells is mitosis, also unrelated to photosynthesis.
Focus on the correct option: Photosynthesis is the process by which light energy is converted into chemical energy in the form of glucose. This matches the correct answer provided in the problem.
Conclude by reinforcing the importance of photosynthesis: It is essential for life on Earth as it provides the primary energy source for most living organisms and produces oxygen as a byproduct, which is vital for aerobic respiration.
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