Open and closed stomatal poreखुला और बंद रंध्र

NCERT Fig 5.3 · interactive diagram

Parts and their functions

• Stomatal pore (रंध्र छिद्र) — Tiny pore in the leaf surface; exchange of gases (O₂, CO₂) for photosynthesis and respiration; water vapour is also lost here.
• Guard cells (द्वार कोशिकाएँ) — Open and close the pore: water flows in → they swell → pore opens; water flows out → they shrink → pore closes.
• Chloroplasts (हरितलवक) — Guard cells contain chloroplasts (green). Chlorophyll inside chloroplasts absorbs light for photosynthesis.
• Nucleus (केंद्रक) — Each guard cell has its own nucleus.
• Epidermal cells (बाह्यत्वचा कोशिकाएँ) — Surface cells of the leaf around the stomata.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 5.3. Report a mistake