alleryWhich experiment shows that CO2 is released during respiration?
ALime water turns blue in oxygen experiments
BIodine produces a blue-black colour with starch
CKOH absorbs the CO2 produced, water rises into a flask
DCobalt chloride paper turns blue in moisture
Answer & Solution
Correct answer: C. KOH absorbs the CO2 produced, water rises into a flask
1. The chapter sets up germinating seeds in a flask with KOH inside.
2. KOH absorbs CO2 released by the seeds, lowering air pressure.
3. Water rises into the flask to replace the absorbed gas.
4. This shows CO2 is released during respiration.
_Source: Selina Concise Biology Class 9, Ch 7 Respiration in Plants (Mistral OCR'd PDF), section on CO2 evolved_
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