Respiratory system 3

Plant respiration

Stomata

Tiny pores in the lower epidermis of leaves, regulated by guard cells for gas exchange.

Guard cells

Bean-shaped cells that surround each stoma, controlling its opening and closing.

Lenticels

Breathing pores or openings found in the bark of older stems, allowing gas diffusion.

Mechanism of gaseous exchange in plants

Process where oxygen diffuses into plants through stomata and lenticels, while carbon dioxide and water vapor diffuse out, driven by concentration gradients.

Photosynthesis

Process by which plants convert light energy into chemical energy, producing oxygen as a by-product and consuming carbon dioxide and water.

Gaseous exchange in plants at night

Plants take in oxygen and give out carbon dioxide and water vapor primarily during the night when photosynthesis does not occur.

Importance of guard cells

Guard cells are crucial for regulating the opening and closing of stomata, thus controlling gas exchange and preventing water loss.

Diffusion process in plants

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