Plants general structure

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Slide 1

Plants Structure

Leaves

stem

roots

Slide 2

Leaves

Slide 3

Function of leaves

Trap light energy for photosynthesis

Producing sugar from photosynthesis

Exchange of gases – oxygen and carbon dioxide

Slide 4

Slide 5

Structure

Wide

Helps to catch more light energy

Thin

Help get carbon dioxide from bottom to top of leaf for photosynthesis

Slide 6

Leaf structure

Greener on top

CO2 gets in here

Slide 7

Leaf diagram – palisade layer

CO2

Most chlorophyll

Slide 8

Leaf cell - palisade

Position?

Upper surface of leaf

Features?

Box shape

Chloroplasts

Function?

Photosynthesis

Slide 9

Gas exchange

Leaves are designed to allow carbon dioxide to get to the main chlorophyll layer at the top of the leaf

They have small holes called stomata on the under surface

Each hole is open & closed by 2 guard cells

Slide 10

Leaf diagram – stoma and guard cells

Slide 11

Stoma position

Slide 12

Stoma is a small hole

Its size is controlled by 2 guard cells

closed

open

Slide 13

Stoma function is for gas exchange in the leaf

Carbon dioxide

oxygen

Guard cell

Provided plant is photosynthesising

Slide 14

Stomata open and close at different times of the day

When it is light the plant needs CO2 for photosynthesis so the stoma open

At night (darkness) they close

Slide 15

Gas exchange

Slide 16

Roots – function and structure