Download Chapter 8: Plant Organs: Leaves

 AGV03/BIOLV23 Fall 2010 Name: ________________________________ Algiers, K Chapter 8: Plant Organs: Leaves Leaf Form & Function • Leaves are the most variable ________________________ –
Composed of a _____________ and a ________________ –
May have _____________ (pair of leaf‐like outgrowths at petiole) •
_____________ : having a single blade •
_____________ : having a blade divided into 2 or more leaflets •
_____________ _____________ leaflets are borne on an axis that is a continuation of petiole •
_____________ _____________ leaflets arise from a common point at the end of the petiole –
Look for axillary bud to determine of a leaf is simple or compound –
Leaflets don’t have axillary buds AGV03/BIOLV23 Fall 2010 Name: ________________________________ Algiers, K •
Leaves are arranged on the stem in 3 ways 1. _________________ Leaf arrangement – one leaf at each node (node – where leaf attaches on stem) 2. _________________ Leaf arrangement – two leaves grow at each node 3. _________________ Leaf arrangement – three or more leaves grow at each node •
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Leaf blades may have parallel or netted venation –
_______________ venation – veins run parallel to one another along the leaf’s long axis –
_______________ venation – smaller and smaller veins branch off larger veins (resembles a net) •
____________________ netted ‐ veins branch off mid‐vein •
____________________ netted (veins come from one point) AGV03/BIOLV23 Fall 2010 Name: ________________________________ Algiers, K •
Main organs for _______________________ –
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Absorb __________________ to produce __________________ molecules Allows __________________ exchange –
For __________________ as well as __________________ Internal Structure of the Leaf •
Leaf Blade has an ______________ & ______________ epidermis –
Epidermis contains a ______________ (waxy excretion) that helps reduce water loss –
Epidermis contains ______________ & _______________________ –
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___________________ ‐ small pores for gas exchange •
___________________ – open & close the stomata •
When photosynthesis is occurring, guard cells inflate & stoma ________ •
When guard cells deflate, stoma ________ Epidermis of some leaves have ______________________ •
_______________________ structures •
Aid in reducing _______________________ May secrete ___________________ irritants that _________ animals from feeding on them AGV03/BIOLV23 Fall 2010 Name: ________________________________ Algiers, K •
___________________ – photosynthetic ground tissue –
Tissue between ______________ & ______________ epidermis –
______________ mesophyll – columnar cells (tightly stacked) are found towards the upper epidermis –
______________ mesophyll – loosely arranged cells in the lower portion (more gas exchange) •
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______________ ‐ Vascular bundles –
contain ______________ & ______________ tissues within the ___________________ –
______________ usually located on the upper side of vein –
______________ usually located on the lower side of the vein Monocot vs. Eudicots –
Eudicots contain _____________, _____________________ blades & petioles •
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_____________ Venation Monocots contain a _____________ petiole , •
Some contain no ___________________ (leaf wraps around stem for form a sheath) •
_____________ venation –
Some monocots don’t have distinct ______________& ___________________ layer –
Eudicot guard cells are _____________ shaped –
Monocot guard cells are __________________ shaped AGV03/BIOLV23 Fall 2010 Name: ________________________________ Algiers, K Transpiration •
_______________of the water that a plant absorbs from the soil is lost by _________________ from leaves & stems –
_________________ – loss of water vapor from a plant’s aerial parts Specialized Leaves •
Leaf ________________________ are _______________ to different environmental pressures –
____________________– modified leaves that are hard and pointed, found in many desert plants such as cacti –
____________________– modified leaves associated with flowers (look like petals) –
____________________– modified leaves that help keep the vine attached to objects –
___________________________– store water, carbohydrates, or other nutrients –
___________________________– thicker or leathery leaves, fewer stomata, succulent leaves; no leaves; hairs; thicker cuticles –
___________________________– less xylem than phloem; larger air spaces –
___________________________– become symbiotic pouches where ants live –
___________________________– leaves are buried in sand with transparent tips exposed; adaptation for high, sandy wind AGV03/BIOLV23 Fall 2010 Name: ________________________________ Algiers, K –
___________________________– leaves of some ferns & air plants that produce new plant at tips –
____________________________________– in areas with deficiency of Nitrogen in soil •
Trap __________________ & digest __________________ •
Plant can still __________________ Pitcher Plant - collect ___________________, glands attract
____________________ that get trapped inside
Sundews - contain ___________________________at tip of hair to
______________ insects
Venus Fly Trap - ___________________ need to be triggered to close in
http://www.youtube.com/watch?v=ktIGVtKdgwo http://www.youtube.com/watch?v=trWzDlRvv1M
http://news.bbc.co.uk/earth/hi/earth_news/newsid_8195000/8195029.stm
AGV03/BIOLV23 Fall 2010 Name: ________________________________ Algiers, K Review Questions
1. Draw diagrams of a simple pinnately netted , simple palmately netted, compound pinnate,
compound palmate, and parallel leaf. Label the blade, petiole, leaflet, and leaf
2. Draw an alternate, opposite, and whorled leaf arrangement
3. What are the main functions of leaves?
4. Use the picture below to label: upper &
lower epidermis; stoma, guard cells; xylem,
phloem, bundle sheath; vascular bundle;
palisade mesophyll, and spongy mesophyll
AGV03/BIOLV23 Fall 2010 Name: ________________________________ Algiers, K 5. What is the function of
o Stoma:
o Guard Cell:
o Mesophyll Cells
o Phloem and Xylem
o Trichomes
o Transpiration
5. Name some ways to distinguish a monocot from a eudicot using leaf shape & vein, guard
cell shape, and mesophyll arrangement.
6. Describe each leaf modifications and the significance of the adaptation:
o Spines
o Bracts
o Tendrils
o Storage leaves
AGV03/BIOLV23 Fall 2010 Name: ________________________________ Algiers, K o Leaves of Arid regions
o Leaves of aquatic areas
o Flower pot leaves
o Window leaves
o Reproductive leaves
o Floral leaves (bracts)
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Insect Trapping leaves (name the three kinds we discussed in class)