Notes: Leaf Structure (page 6)

Notes: Leaf Structure (pg 6)

• Leaves are plant organs specialized for photosynthesis

Parts of a leaf

• Cuticle: Waxy covering. Prevents water loss

Parts of a leaf

• Cuticle: Waxy covering. Prevents water loss• Epidermis: Layer of cells that form the top

and bottom of leaf.

Parts of a leaf

• Cuticle: Waxy covering. Prevents water loss• Epidermis: Layer of cells that form the top

and bottom of leaf. • Palisade mesophyll: Tightly packed, tall

narrow cells. Lots of chloroplasts. Performs most photosynthesis.

Parts of a leaf

• Cuticle: Waxy covering. Prevents water loss• Epidermis: Layer of cells that form the top

and bottom of leaf. Protection, gas exchange• Palisade mesophyll: Tightly packed, tall

narrow cells. Lots of chloroplasts. Performs most photosynthesis.

• Spongy mesophyll: Rounded, loosely packed cells. Fewer chloroplasts

Parts of a leaf• Cuticle: Waxy covering. Prevents water loss• Epidermis: Layer of cells that form the top and

bottom of leaf. Protection, gas exchange• Palisade mesophyll: Tightly packed, tall narrow

cells. Lots of chloroplasts. Performs most photosynthesis.

• Spongy mesophyll: Rounded, loosely packed cells. Fewer chloroplasts

• Vascular bundles: Contain xylem (transports water) and phloem (transports food)

Stomata• Holes on the underside of leaves

Stomata• Holes on the underside of leaves• Let CO2 in, O2 and water out

Stomata• Holes on the underside of leaves• Let CO2 in, O2 and water out• 2 Guard cells open and close each stoma

Stomata• Holes on the underside of leaves• Let CO2 in, O2 and water out• 2 Guard cells open and close each stoma

Closed Open

Output: Construct a Leaf (pg 7)• First, color your leaf parts:

– Cuticle: White– Epidermis: Light green – Guard cells: red– Palisade mesophyll: Lots of chloroplasts (dark

green ovals inside cells)– Spongy mesophyll: A few chloroplasts– Xylem: Pink– Phloem: Blue

• Cut out the parts and paste them in the correct order on the top half of pg 7

• Label each part