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Q. Carbon dioxide is necessary for photo...

Q. Carbon dioxide is necessary for photosynthesis. The chemical used to remove this gas most effectively from entering a control apparatus is

A

a) Calcium oxide

B

b) Distilled water

C

c) Potassium hydroxide solution

D

d) Sodium carbonate.

Text Solution

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The correct Answer is:
To solve the question regarding the chemical that effectively removes carbon dioxide from entering a control apparatus for photosynthesis experiments, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Role of Carbon Dioxide in Photosynthesis**: - Photosynthesis is the process by which plants convert carbon dioxide (CO2) and water (H2O) into glucose and oxygen using sunlight. CO2 is a critical reactant in this process. 2. **Identifying the Experiment**: - The question refers to an experiment that demonstrates the necessity of CO2 for photosynthesis. A well-known experiment is Moll's half-leaf experiment, where a leaf is partially exposed to light and partially covered. 3. **Chemical Options**: - The question provides four options to choose from: - A) Calcium oxide - B) Distilled water - C) Potassium hydroxide solution - D) Sodium carbonate 4. **Analyzing Each Option**: - **Calcium oxide**: This compound can absorb moisture and CO2 but is not typically used in photosynthesis experiments. - **Distilled water**: This does not remove CO2; it is simply a solvent. - **Potassium hydroxide (KOH)**: KOH is known to absorb CO2 from the air, making it effective for removing CO2 in experiments. - **Sodium carbonate**: This compound can react with acids but is not specifically used to absorb CO2 in the context of photosynthesis. 5. **Conclusion**: - Based on the analysis, the most effective chemical for removing CO2 from the control apparatus is **potassium hydroxide solution (KOH)**. Therefore, the correct answer is **option C**. ### Final Answer: **C) Potassium hydroxide solution** ---
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