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Unicellular algae X and Y of the same sp...

Unicellular algae X and Y of the same species were taken and 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 Y 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.

Text Solution

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**Step-by-Step Solution:** 1. **Understanding the Organisms**: We have two unicellular algae, X and Y, which belong to the same species. Algae are capable of photosynthesis, which requires chloroplasts containing chlorophyll. 2. **Chloroplast Removal**: In this scenario, chloroplasts are removed from algae X. This means that algae X will not be able to perform photosynthesis, as chloroplasts are essential for this process. 3. **Exposure to Sunlight**: Both algae X and Y are kept in bright sunlight for a few hours. Algae Y, which still has its chloroplasts, will undergo photosynthesis and produce starch as a byproduct. 4. **Iodine Test**: After the exposure to sunlight, an iodine test is performed on both algae. The iodine test is used to detect the presence of starch. If starch is present, the iodine will turn blue-black. 5. **Results for Algae X**: Since algae X does not have chloroplasts, it cannot perform photosynthesis and therefore will not produce any starch. As a result, when iodine is applied, there will be no color change in algae X. 6. **Results for Algae Y**: Algae Y, on the other hand, has intact chloroplasts and can perform photosynthesis. It will produce starch, and when iodine is applied, it will turn blue-black due to the presence of starch. 7. **Conclusion**: The results of the iodine test will show that algae X remains unchanged (no color change), while algae Y turns blue-black. **Final Results**: - Algae X: No color change (remains original color) - Algae Y: Turns blue-black ---
**Step-by-Step Solution:** 1. **Understanding the Organisms**: We have two unicellular algae, X and Y, which belong to the same species. Algae are capable of photosynthesis, which requires chloroplasts containing chlorophyll. 2. **Chloroplast Removal**: In this scenario, chloroplasts are removed from algae X. This means that algae X will not be able to perform photosynthesis, as chloroplasts are essential for this process. 3. **Exposure to Sunlight**: Both algae X and Y are kept in bright sunlight for a few hours. Algae Y, which still has its chloroplasts, will undergo photosynthesis and produce starch as a byproduct. ...
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