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Grade 11 University Biology – Unit 5 Plants
Leaves
Section 13.3 Page 552-559
Use your textbook to answer the following questions.
1. Green leaves are the major site of ___________________________. The pigment that captures
light is called ________________________.
2. The parts of the leaf are (1) _____________________ which is a flattened main body of the leaf
and (2) ______________________ which is the supporting stalk. Leaves attach to the stem at a
point called the ___________________.
3. Draw a sketch that shows the parts of a leaf.
4. Give two examples of trees that have SIMPLE LEAVES.
5. Give two examples of tress that have COMPOUND LEAVES.
6. Fill in the chart with the function of the different types of cells in the leaf.
Leaf Structure
Description
Function
Epidermal Cells
Mesophyll Cells
Palisade Mesophyll
Spongy Mesophyll
7. Write out a word equation for photosynthesis
_______________ +____________ + ____________
_____________ + _____________
8. Which type of leaf is most efficient at photosynthesis? Why? Provide one reason.
9. What is the purpose of the STOMA?
10. Where on the leaf are most stoma found?
11. What does it mean when the stomata are closed?
12. What does TRANSPIRATION have to do with stomata?
13. A stoma opens when the guard cells absorb _______________ meaning the plant is in
__________________ conditions.
14. A stoma closes when the guard cells lose ______________ meaning the plant is in
__________________ conditions.
15. Fill in the chart with leaf adaptations
Plant
Cacti
Onion bulb
Conifer (pine tree)
Shade plants
Sun-loving plants
Adpatation
Conditions adapted to
Answers
Leaves
Use Pages 301-304 in your textbook to answer the following questions.
1. Green leaves are the major site of PHOTOSYNTHESIS. The pigment that captures light is called
CHLOROPHYLL.
2. The parts of the leaf are (1) BLADE which is a flattened main body of the leaf and (2) PETIOLE
which is the supporting stalk. Leaves attach to the stem at a point called the NODE.
3. Draw a sketch that shows the parts of a leaf.
4. Give two examples of trees that have SIMPLE LEAVES.
POPLAR, OAK, MAPLE
5. Give two examples of tress that have COMPOUND LEAVES.
BLACK LOCUST, RED BUCKEYE
6. Fill in the chart with the function of the different types of cells in the leaf.
Leaf Structure
Description
Function
Epidermal Cells
WAXY CUTICLE ON UPPER AND
LOWER LEAF SURFACE
PRODCUE CUTICLE TO PROTECT
LEAF
Mesophyll Cells
RICH IN CHLOROPLASTS
PHOTOSYNTHESIS
Palisade Mesophyll
TIGHTLY PACKED
PHOTOSYNTHESIS
Spongy Mesophyll
LOOSELY PACKED
PHOTOSYNTHESIS
7. Write out a word equation for photosynthesis
CARBON DIOXIDE +WATER + SUNLIGHT
OXYGEN + GLUCOSE
8. Which type of leaf is most efficient at photosynthesis? Why? Provide one reason.
BRAOD LEAF PLANTS - LARGER SURFACE AREA
9. What is the purpose of the STOMA?
GAS EXCHANGE
10. Where on the leaf are most stoma found?
BOTTOM OF LEAF
11. What does it mean when the stomata are closed?
PREVENT WATER LOSS
12. What does TRANSPIRATION have to do with stomata?
WATER IS EVAPORTATING FROM THE PLANT AT THE STOMA
13. A stoma opens when the guard cells absorb WATER meaning the plant is in MOIST conditions.
14. A stoma closes when the guard cells lose WATER meaning the plant is in DRY conditions.
15. Fill in the chart with leaf adaptations
Plant
Adpatation
Conditions adapted to
Cacti
LACK LEAF BLADE
PREVENT WATER LOSS
Onion bulb
MODIFIED LEAF
STORAGE OF SUGAR
Conifer (pine tree)
NEEDLES
COLD AND DRY
Shade plants
THIN, BROAD, MORE
CHLOROPHYLL
SHADE
Sun-loving plants
LOTS OF SUN
Grade 11 University Biology – Unit 5 Plants
Anatomy of Function of a Leaf
The anatomy of leaf maximizes photosynthesis and reduces water loss. The arrangement of
tissues allows the manufacture of nutrients while simultaneously bringing water to the tissues and
moving food to other parts of the plant. Some leaf parts reduce evaporation while other regulate
the exchange of gases with the environment.
Figure 1. Leaf Anatomy
For each part listed in Figure 1, identify its function.
 Cuticle

Upper epidermis

Palisade mesophyll cell

Bundle sheath cell

Xylem

Phloem

Lower epidermis

Spongy mesophyll

Guard cells

Stoma

Vein