Which of the following plant products can be used to confirm that photosynthesis has taken place?
glucose
fats
protein
starch
vitamins
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The correct answer is:
D. Starch
Why Starch?
Direct Product of Photosynthesis:
Glucose (a simple sugar) is the immediate product of photosynthesis, but plants quickly convert it into starch for storage.
Starch is insoluble and accumulates in leaves (e.g., in chloroplasts), making it easier to detect.
To confirm photosynthesis, starch is tested using iodine solution:
Result: Starch turns blue-black, proving photosynthesis occurred.
Why Not Others?
A. Glucose: While glucose is produced, it’s rapidly used/metabolized; no simple test confirms its presence post-photosynthesis.
B. Fats / C. Proteins / E. Vitamins: These are secondary products derived from glucose, not direct evidence of photosynthesis.
