Experiment: A water plant was placed in water with baking soda under sunlight. Bubble count was recorded over 30 minutes.Observation: More bubbles were released compared to water without baking soda.Question: What does this show?
Correct answer: A. Increased CO₂ from baking soda enhances photosynthesis.
- A. Increased CO₂ from baking soda enhances photosynthesis.
- B. Baking soda reduces light absorption.
- C. Bubbles are due to root respiration.
- D. CO₂ suppresses oxygen production.
Explanation
The experiment demonstrates that baking soda, by releasing CO₂ in water, boosts photosynthesis in the water plant. Photosynthesis requires sunlight, water, and carbon dioxide for glucose and oxygen production. The higher bubble count indicates increased oxygen production from photosynthesis. Therefore, Option A is correct. Option B is incorrect as baking soda does not impact light absorption. Option C is incorrect because bubbles mainly result from photosynthesis, not root respiration. Option D is incorrect because CO₂ is essential for photosynthesis and does not inhibit oxygen production.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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