The photograph shows part of a leaf of a green plant - Junior Cycle Science - Question b - 2015
Question b
The photograph shows part of a leaf of a green plant.
(i) Name a gas that moves into and a gas that moves out of a green leaf during active photosynthesis.
Gas in
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Worked Solution & Example Answer:The photograph shows part of a leaf of a green plant - Junior Cycle Science - Question b - 2015
Step 1
Name a gas that moves into a green leaf during active photosynthesis.
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Answer
The gas that moves into a green leaf during active photosynthesis is carbon dioxide (CO₂).
Step 2
Name a gas that moves out of a green leaf during active photosynthesis.
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Answer
The gas that moves out of a green leaf during active photosynthesis is oxygen (O₂) and water vapour (H₂O).
Step 3
Outline an experiment to show that photosynthesis produces starch.
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Answer
Cover the leaf of a plant with aluminum foil to prevent photosynthesis.
Place the plant in the dark for a period of time to de-starch.
After that, place the plant in bright light for several hours to allow photosynthesis to occur.
Remove the chlorophyll by boiling the leaf in alcohol.
Once the leaf is boiled, add iodine solution to the leaf.
Observe the color change; only the parts of the leaf exposed to light will turn blue-black, indicating the presence of starch.
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