Leaves

Leaf Anatomy

Importance of Leaves

​Leaves allow plants to do photosynthesis to make their own food.

​

​Leaves harness the energy from the sun and pass it to the next level of the food chain.

Leaf Structure

​The leave is attached to the stem by a petiole.

​

The edge of the leaf is called the margin.

​

​The apex is the tip of the leaf and the base is the bottom that attached to the petiole.

Multiple Choice

thin stalk that connects the blade of the leaf to the plant's stem

• blade

• cuticle

• petiole

• epidermis

Multiple Choice

What is the main body of the leaf called?

• Blade

• Petiole

• Vein

• Margin

Multiple Choice

The apex is located at the ____________ of the leaf blade whereas the base is located at the ____________.

• top, bottom

• bottom, top

• center, bottom

• center, top

​Leaves can either be simple or compound.

​

​

​Compound leaves have leaflets attached to the midrib by their own stalks.

Multiple Choice

Primarily, leaves are divided into two categories simple and compound.

• False

• True

Multiple Select

Which of the following is a simple leaf? Check all that apply.

Multiple Choice

Which of the following is NOT a compound leaf?

Fill in the Blanks

How many leaf blades does a simple leaf have?

Multiple Choice

If there are 2 or more leaflets attached to the petiole, it is called

• compound leaves

• palmate leaves

• pinnate leaves

• simple leaves

Leaf Margins

​Entire - a smooth edge

​

​Serrate - forward pointing like a saw or knife

​

​Lobed- smooth, round bumps

​

​Parted- big indentations in the leaf edge

Multiple Choice

Leaf margin?

• Lobed

• Serrated

• Entire

• Undulate

Multiple Choice

How do you call the part that is the edge of the leaf?

• Vein

• Petiole

• Leaf margin

• Mid vein

• Leaf blade

Multiple Choice

A leaf margin that DOES NOT contain teeth is called ______________.

• entire

• serrate

• lobed

​Leaf Venation

Parallel - Veins run along side each other along the length of the leaf.

​

​Palmate - Veins radiate out from the base

​

​Pinnate- Branching off from one main vein

Multiple Choice

The pattern of veins on the leaf.

• Design

• Lamination

• Venation

• Pollination

Multiple Choice

Which type of venation pattern never allows the veins to cross?

• Netted

• Parallel

• Dichotomous

Multiple Choice

When the veins runs parallel to each other from the base to the tip of the leaf is called________ venation

• parallel

• Reticulate

• straight

• linear

Layers of a Leaf

​A leaf consists of the following layers:

​1. Cuticle

​2. Upper epidermis

​3. Palisade mesophyll

​4. Spongy mesophyll

​5. Lower epidermis

​6. Pores (openings) also known as stomata

Cuticle - ​Thick, waxy covering that protects plants from drying out

​

​Epidermis - Single, protective layer of cells

​

​Mesophyll - Conducts photosynthesis, has chloroplasts 

​

​Stomata - Allow gases into and out of the leaf for photosynthesis

Multiple Choice

____________­lines the lower area of the leaf.

• blade

• cuticle

• petiole

• epidermis

Multiple Choice

_________is where photosynethesis actually occurs

• mesothelioma

• mesophyll

• metophyll

Multiple Choice

What is the function of a cuticle?

• Water Transport

• Sugar Transport

• Reduce Water Loss

• Increase Water Loss

Multiple Choice

Identify the marked structure above.

• Spongy Mesophyll
• Palisade Mesophyll
• Upper Epidermis
• Guard Cell

Multiple Choice

Identify the marked structure above.

• Spongy Mesophyll
• Lower Epidermis
• Stoma
• Cuticle

Multiple Choice

Identify the marked structure above.

• Guard Cell
• Stroma
• Upper Epidermis
• Vascular Bundle