BI-2121
Photosynthesis equation
Biology · Secondary 4 · Medium · Photosynthesis equation
A leaf is tested for starch after being kept in the dark for 24 hours and then exposed to light for 3 hours. The iodine test on the leaf turns blue‑black. What does this result show?
- The leaf carried out photosynthesis during the 3 hours in light.
- The leaf stored starch only before it was kept in the dark.
- Light is not needed for starch production in leaves.
- The iodine test is used to detect glucose in leaves.
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