Term
| What are the parts of a leaf? |
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Definition
The blade - usually the flat surface
The petiole - the stem of the leaf |
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Term
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Definition
A leaf with a complete or undivided blade.
Ex. Maple leaf |
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Definition
| This is an example of a simple leaf. |
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Term
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Definition
| A leaf whose blade is divided into several leaflets |
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Term
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Definition
Pinnately compound leaf.
The leaflets come off of a center axis. |
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Term
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Definition
Palmately compound leaf.
All the leaflets arise from the same center point. |
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Term
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Definition
| The pattern of veins along the leaf blade. |
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Term
| What kind of venation pattern do we see in monocots? |
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Definition
| Monocots usually have parallel venation. |
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Term
| What kind of venation pattern do eudicot leaves have? |
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Definition
| Eudicot leaves have netted or branching venation. |
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Term
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Definition
Palmately netted
All the veins arise from one point, at the top of the petiole |
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Term
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Definition
Pinnately netter
All of the veins branch off of a center or main vein. |
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Term
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Definition
Parallel venation
In monocot leaves |
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Term
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Definition
Dichotomously branched
The veins branch only once so they almost look parallel
Only seen in ginkgo leaves |
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Term
| Epidermis - upper and lower |
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Definition
Layer of parenchyma cells
Protects the leaf from damage, water loss
These cells do NOT contain chloroplasts so they are NOT green. |
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Term
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Definition
Waxy layer on the leaf surface
Reduces water loss |
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Term
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Definition
Layer of tall cells in eudicot leaves.
These cells have many chloroplasts so their job is to do photosynthesis |
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Term
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Definition
Layer of cells in the bottom of a eudicot leaf, under the palisade mesophyll.
These cells are irregularly shaped.
They do photosynthesis.
There are many small air spaces around them which allows for gas exchange. |
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Term
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Definition
Tiny pores in the leaf surface that are connected to the air spaces in the spongy mesophyll.
These pores let CO2 into the leaf.
They let oxygen and water vapor out.
They are usually found on the BOTTOM of the leaf. |
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Term
| Vascular bundle or vein in a leaf |
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Definition
| It contains xylem (transports water) and phloem (transports sugar). |
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Term
| How are the xylem and phloem arranged inside a vein in a leaf? |
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Definition
| The xylem is always on top and the phloem is on the bottom. |
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Term
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Definition
The cells that make up the stomata or tiny pores in the leaf.
Eudicots - shaped like kidney beans
Monocots - shaped like dumbbells
Guard cells are the only cells in the epidermis that contain chloroplasts. |
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Term
| How can you tell if a eudicot leaf is right side up or upside down? |
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Definition
1. The palisade mesophyll is near the top.
2. The xylem is on top in the vascular bundle.
3. There are more stomata on the bottom of the leaf. |
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Term
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Definition
Special leaves found in some monocot leaves.
They are large cells. When the plant loses too much water, these cells shrink, causing the leaf to curl up. This reduces water loss from the plant. |
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Term
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Definition
| The loss of water from leaves through hydathodes. |
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Term
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Definition
| Tiny pores at the margin or edge of the leaf. Excess water can be lost through these pores. |
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Term
| How can plants reduce water loss? |
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Definition
Reduce leaf size or surface ares
Add a thick cutice layer
Cover the leaf with trichomes or hairs
Close the stomata
Put most of the stomata on the bottom of the leaf
Reduce the numberof stomata
Put the stomata in sunken pits |
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Term
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Definition
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Term
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Definition
| This means the leaf has a smooth margin. |
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Term
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Definition
This means the edge of the leaf has tiny teeth.
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Term
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Definition
Alternate leaf arrangement
One on the left, one on the right
Only one leaf at each node |
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Term
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Definition
Opposite leaf arrangement
Two leaves at each node |
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Term
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Definition
Whorled leaf arrangement
Three or more leaves at each node |
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Term
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Definition
Leaves that do not have a petiole.
Ususally a monocot leaf |
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Term
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Definition
| A plant that drops it leaves in the autumn |
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Term
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Definition
The process of dropping a leaf.
An abscission layer forms at the base of the petiole. |
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