Plants

PLANTS

PHOTO = light SYNTHESIS = composition

PHOTOSYNTHESIS

CHLOROPLAST AND CHLOROPHYLL

CHLOROPLAST: the

organelle (plastid) that

contains chlorophyll

CHLOROPHYLL:the green pigment within the chloroplast

Too strong - radiation

Too weak - insufficient

Plants absorb the RED and BLUE light

Plants reflect GREEN and YELLOW light

PLANTS

SEEDEDSEEDLESS

VASCULARNON-VASCULAR

FLOWERING PLANTS

(ANGIOSPERMS)

NAKED SEEDS (GYMNOSPERM

)

Vascular Tissues

Transport of water and

nutrients in vascular plants

1. Root2. Stem3. Leaf

Root- Absorb water and nutrients- Reinforce the plant to the

substrate- Store food

Abosrption of water through root hairsRoot hairs are shortlived and regenerate the whole time

Active absorption of waterenergy used to absorb water through root hairs

Passive absorption of waterabsorption is done through transpiration (release of water through leaves). Root

hairs do not have an active role

Pando – trembling giant

• 430,000 m2

• ONE root system• 6,000,000 kg• 80,000 years old

Stem

- Transport of water and nutrients to the other parts of the plant

- Support for leaves, flower and fruits

- Store food- Photosynthesis

*Diameter: 7.7m*Height: 83.8m*Age: 2,300 – 2,700 years

Transport of water and nutrients from the root to the stem and other parts of the plant

Transpiration (evaporation of water through leaves)

Only 5% of the whole amount of water absorbed by the plant is used for its growth. 95% is release through transpiration

Importance of Transpiration

Higher Plants

VegetativeOrgans

Root Stem Leaf

ReproductiveOrgans

Flower Seed Fruit