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ans:Bubbles: Sometimes you see bubbles coming from a plant in water. These bubbles are oxygen, which the plant makes during photosynthesis.
Color Change: If you put a special liquid near a plant, it can change color. This happens because the plant uses carbon dioxide, which makes the liquid more basic (less acidic).
Leaves Moving: Plants move their leaves to catch more sunlight. When they move towards light, it means they're trying to do more photosynthesis.
Getting Bigger: When plants grow taller or get more leaves, it means they're making food (sugar) from sunlight, which is what photosynthesis does.
Green Color: Plants are usually green because of something called chlorophyll. Chlorophyll helps them use sunlight to make food, so if you see green leaves, it means the plant is probably doing photosynthesis.
Simpler ways scientists investigate and confirm photosynthesis in plants:
Oxygen Production: Plants release oxygen during photosynthesis. Scientists measure this oxygen to confirm the process is happening.
Carbon Dioxide Uptake: Plants absorb carbon dioxide during photosynthesis. Instruments can measure how much carbon dioxide they take in.
Chlorophyll Fluorescence: Chlorophyll, which captures light for photosynthesis, emits a faint glow under certain lights. This glow indicates active photosynthesis.
Isotope Labeling: Scientists use labeled carbon dioxide to trace where carbon goes during photosynthesis. This helps confirm the process.
Leaf Disc Experiment: Floating leaf discs in water under light shows bubbles of oxygen. This demonstrates ongoing photosynthesis.
ATP and NADPH Production: Photosynthesis produces energy molecules like ATP and NADPH. Measuring these confirms photosynthesis is occurring.
Chloroplast Observation: Microscopes can show chloroplasts, where photosynthesis happens, actively working inside plant cells.