🫁
Activity 5.4 — CO₂ Release in Respiration
NCERT Activity 5.4: Germinating seeds release CO₂ during respiration (lime water turns milky), but boiled seeds do not. Proves respiration is a life process.
How To Perform
1
Setup: Germinating Seeds
Connect germinating seeds to lime water via delivery tube.
2
Setup: Boiled Seeds (Control)
Connect boiled (dead) seeds to lime water.
3
Observe: Germinating Seeds
Lime water turns milky — CO₂ released by respiration.
4
Observe: Boiled Seeds
Lime water stays clear — no respiration in dead seeds.
5
Conclude
Respiration occurs only in living cells.
⚠️ Safety Notes
- •Handle lime water (Ca(OH)₂) with care — it is mildly caustic and can irritate skin.
- •Boiled seeds are hot — allow them to cool before handling.
- •Use gloves when handling antiseptic chemicals.