Multiple Choice
Which of the following best describes how light intensity and distance from a light source affect the rate of photosynthesis in plants?
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9. Photosynthesis
Introduction to Photosynthesis
Multiple Choice
Which vitamin is synthesized by the skin upon exposure to sunlight?
A
Vitamin C
B
Vitamin B12
C
Vitamin K
D
Vitamin D
Verified step by step guidance1
Understand the role of sunlight in vitamin synthesis: Sunlight, specifically ultraviolet B (UVB) radiation, plays a critical role in the synthesis of certain vitamins in the human body.
Identify the vitamin synthesized by the skin: The skin synthesizes Vitamin D when exposed to UVB radiation from sunlight. This process begins with the conversion of 7-dehydrocholesterol, a compound in the skin, into pre-vitamin D3.
Clarify why other options are incorrect: Vitamin C is obtained from dietary sources like fruits and vegetables, Vitamin B12 is primarily found in animal products and requires intrinsic factor for absorption, and Vitamin K is synthesized by gut bacteria or obtained from leafy greens.
Explain the importance of Vitamin D: Vitamin D is essential for calcium absorption and bone health. It also plays a role in immune function and other physiological processes.
Summarize the process: Exposure to sunlight triggers the skin to produce Vitamin D, which is then converted into its active form in the liver and kidneys to perform its biological functions.
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