plant tissues and organs

The 4 Plant organs

Roots, stalk, leaves, flower

Roots purpose

• Take up water and mineral ions from the soil

• Works as an anchor

Stalk purpose

• Transport substances

• Support

Flower purpose

• Reproduction

Leaves purpose

• Photosynthesis

• Water vapour leaving plants

Leaf structure - waxy cuticle purpose

• Water proof

• Keeps out dirt, bacteria etc

• Protective layer, once cell thick

Leaf structure - stomata purpose

• Holes for diffusion of gasses

Leaf structure - guard cells purpose

• Open and close stomata

• Control what goes in and out

Leaf structure - spongy mesophyll purpose

• Space for gas diffusion

Leaf structure - palisade cells purpose

• Lots of chloroplasts

• Where photosynthesis occurs

Leaf structure - epidermis purpose

• Let sunlight through

• Prevent water from getting out

What is the gas going into leaves for photosynthesis

Carbon dioxide

What is the gas coming out after photosynthesis

Oxygen

What does the xylem do

Transport water and mineral ions from the roots to the leaves for photosynthesis, not using any energy

When there is too much water in a plant,

It can evaporate out of leaves

What toes the phloem do

Transport dissolved glucose/food from photosynthesis up and down around the whole plant, using energy

Movement of water etc in xylem is called

Transpiration

Movement of glucose around plant in the phloem is called

Translocation