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Question
In half leaf experiment, a part of a leaf is enclosed in a test tube containing KOH soaked cotton, while the other half is exposed to air and then setup is placed in light for sometime. It was later found that part of leaf, which was exposed to air tested positive for starch. This indicates that?
In half leaf experiment, a part of a leaf is enclosed in a test tube containing KOH soaked cotton, while the other half is exposed to air and then setup is placed in light for sometime. It was later found that part of leaf, which was exposed to air tested positive for starch. This indicates that?
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Solution
The correct option is D Carbon dioxide is essential for photosynthesis because in KOH soaked leaf, starch synthesis do not occur as CO2 is absorbed by KOH, so CO2 is not available for photosynthesis
Photosynthesis is the process used by plants, algae and certain bacteria to harness energy from sunlight and turn it into chemical energy. Here, we describe the general principles of photosynthesis and highlight how scientists are studying this natural process to help develop clean fuels and sources of renewable energy. During oxygenic photosynthesis, light energy transfers electrons from water (H2O) to carbon dioxide (CO2), to produce carbohydrates. In this transfer, the CO2 is "reduced," or receives electrons, and the water becomes "oxidized," or loses electrons. Ultimately, oxygen is produced along with carbohydrates. when a part of leaf is enclosed in a test tube containing KOH soaked cotton, Potassium hydroxide absorbs carbon dioxide, so the leaf sealed inside the glass container is in air without carbon dioxide. Without carbon dioxide, process of photosynthesis cannot take place.So the correct option is 'carbon dioxide is essential for photosynthesis because in KOH leaf, starch synthesis do not occur as CO2 is absorbed by KOH, so CO−2 is not available for photosynthesis'.
Photosynthesis is the process used by plants, algae and certain bacteria to harness energy from sunlight and turn it into chemical energy. Here, we describe the general principles of photosynthesis and highlight how scientists are studying this natural process to help develop clean fuels and sources of renewable energy. During oxygenic photosynthesis, light energy transfers electrons from water (H2O) to carbon dioxide (CO2), to produce carbohydrates. In this transfer, the CO2 is "reduced," or receives electrons, and the water becomes "oxidized," or loses electrons. Ultimately, oxygen is produced along with carbohydrates. when a part of leaf is enclosed in a test tube containing KOH soaked cotton, Potassium hydroxide absorbs carbon dioxide, so the leaf sealed inside the glass container is in air without carbon dioxide. Without carbon dioxide, process of photosynthesis cannot take place.
So the correct option is 'carbon dioxide is essential for photosynthesis because in KOH leaf, starch synthesis do not occur as CO2 is absorbed by KOH, so CO−2 is not available for photosynthesis'.
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