6.4 leaves: the green machine

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

6.4 leaves: the green machine

Photsynthesis:

- Plants use carbon dioxide, water and sunlight do to photosynthesis.

- Plants create sugars and oxygen.

- The sugars are used for growth and development and the oxygen is released back into the atmosphere.

photosynthesis

water + carbon dioxide (+ sunlight) => glucose + oxygen

LIMITING FACTORS:

- sunlight

- water

- carbon dioxide

- space

- other nutrients to help with growth

The plant absorbs sunlight through the palisade cells.

The plant absorbs water and nutrients through the roothair cells.

The plant transports water and nutrients up through the xylem vessels.

The plant transports sugars and nutrients down through the phloem vessels.

The plant absorbs carbon dioxide through the stomata cells.

The plant releases oxygen through the stomata cells.

waxy layer - upper outer layer - layer of cells performing photosynthesis - spongy layer - xylem/phloem (vein) - lower outer layer - stoma (pore with guard cells)

vein

waxy layer

upper outer layer

spongy 

layer

stomata

lower outer layer

layer of cells performing photosynthesis

Which vascular tissue transports water?

1. Phloem
2. Chlorophyll
3. Stomata
4. Xylem

What type of plant cell is specialised to help a plant breathe?

1. stomata
2. palissade cell
3. phloem
4. xylem

respiration and photosynthesis

photosynthesis: turning sunlight into glucose (with carbon dioxide and water)  => daytime

respiration: burn glucose to release energy for the plant to use (cells to grow, cells to use for other processes) => daytime and night time!