STOMATA
GUARD CELLS OPEN & CLOSE
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The Leaf's Doorway
O₂ + bhaap ↑
CO₂ in ↓
guard
cell
Din
stomata open
Raat
off
Water + K⁺
guard cells swell
1. Guard Cells
Water in → they swell and curve
→ the pore opens
2. What Passes Through?
In: CO₂ (for photosynthesis)
Out: O₂ + water vapour
3. Remember
Most stomata are on the
underside of the leaf
MATRIC BIOLOGY · GASEOUS EXCHANGE · PUNJAB BOARDS
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