| Unicellular algae X and Y of the same species were taken and experimentally, chloroplasts were removed from cell X. |
| After some time, they both were kept in bright sunlight for few hours and then iodine test was performed on them. What will be the results? |
A) Both X and V will turn blue-black.
B) Cell X will turn blue-black.
C) Cell Y will turn blue-black.
D) Both X and Y will remain as they originally were.
Correct Answer: C
Solution :
Under the sunlight, alga photosynthesises and produces starch. Photosynthesis is performed by chloroplast. As cell X lacked chloroplast, it will not make starch while the cell Y will make it. Iodine turns starch into blue-black colour. Cell Y made starch by photosynthesis, thus it will turn blue-black with iodine solution.
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