Homework Photosynthesis and Leaf Parts

Homework Photosynthesis and Leaf Parts

Due WEDNESDAY March 18th

Name ______Hour ______

Lab / Due:______
Comparison / Data Table / 0 / 1 / 2 / 3
Of Leaves / Questions / 0 / 1 / 2 / 3 / 4 / 5
HW / Page 1 / 0 / 1 / 2 / 3 / 4 / 5
Page 2 / 0 / 1 / 2 / 3
Review / Page 3 / 0 / 1 / 2 / 3 / 4 / 5
Page 4 / 0 / 1 / 2 / 3 / 4 / 5

Your Points

Total Points Possible 26 pts

Comparison of Leaves

Background: In order to better understand the functions of a living green leaf, it is necessary to learn the details in its structure. In your lab, try to correlate the structural details with functions. Visualize how gases enter and exit a leaf, what pathways plants use to circulate the gases throughout the leaf, the pathways water follows throughout the leaf, and what structures prevent the leaf from injury or water loss.

For most plants, there are more stomata’s on the bottom of the leaf than the top of the leaf. This is because the upper portion of the leaf heats up more in sunlight than the lower leaf. The lower surface of the leaf has less water loss due to evaporation than the top of the leaf. The palisade layer towards the upper surface of the leaf is packed tightly to maximize the interception of sunlight passing through the leaf.

Use the prepared leaf cross-section slides of: MAKE SURE EACH SLIDE IS NOT UPSIDE DOWN!

#1 = Privet Leaf #3 = Begonia Leaf

#2 = Corn Leaf #4 = Angiosperm & Gymnosperm Leaves

Slide #1 – Privet Leaf

Privet hedges prefer partial shade to full sun. Examine the prepared slide leaf under a power that allows you to see the top and the bottom of the leaf section. Draw, Color and Label: Upper and Lower Epidermis, the Cuticle, The Palisade Layer, the Veins (Xylem and Phloem), Spongy Layer, Stomata and Guard Cells.

QUESTION: What are the green dots within cells in the Palisade and Spongy layers?______

Slide #2 = Corn Leaf

The plant prefers full sun. Examine the prepared slide leaf under a power that allows you to see the top and the bottom of the leaf section. Draw, Color and Label: Upper and Lower Epidermis, the Cuticle, The Palisade Layer, the Veins (Xylem and Phloem), Spongy Layer, Stomata and Guard

QUESTION: How does this leaf differ from the Privet Leaf?

Slide #3 = Begonia Leaf

Begonias thrive in a range of sunlight from full sun to shade. Examine the prepared slide leaf under a power that allows you to see the top and the bottom of the leaf section. Draw, Color and Label: Upper and Lower Epidermis, the Cuticle, The Palisade Layer, the Veins (Xylem and Phloem), Spongy Layer, Stomata and Guard Cells.

QUESTION: How does this leaf differ from the other leaves?

Slide #4 – Gymnosperm (conifer – produce pine cones so has needles) and Angiosperm leaves (flowering plants)

Examine the prepared slide leaves under a power that allows you to see the top and the bottom of the leaf section. Draw, color and Label: Upper and Lower Epidermis, the Cuticle, The Palisade Layer, the Veins (Xylem and Phloem), Spongy Layer, Stomata and Guard Cells.

MAKE SURE EACH SLIDE IS NOT UPSIDE DOWN!

Questions:

1. What is the major function of leaves?

2. How do deciduous (broad) leaves and coniferous leaves differ?

3. What is the purpose of guard cells?

4. What is found inside a leaf’s veins?

5. How do monocot and dicot leaves differ?

The effect of sunlight and water on leaves:

1. What type of cells causes Leaf B to be thicker than Leaf A?

2. Does Leaf B get more or less sun than the other leaves?

3. How does having these extra cells help Leaf B?

4. What cells are thickest in Leaf C? Is Leaf C getting more water than Leaf A?

5. What material do you think the extra cells in Leaf C store?

6. What is this material used for in Leaf C?

7. Leaf D gets very little water, but lives in very bright sunlight. What types of cells are different in Leaf D?

8. How does this help this Leaf D?

9. What ecosystem might you find Leaf D in?

Leaf Anatomy:

Define each term and color on the following diagram

1. Epidermis (purple) –

2. Cuticle (orange) –

3. Guard Cell (light green) –

4. Stoma (blue) –

5. Palisade Layer (green) –

6. Spongy Layer (yellow) –

7. Air Spaces (brown) –

8. Vascular Bundle Sheath (black) –

9. Vascular Bundle Extension (light black) – these are the veins you can see and feel in leaves.

10. Xylem (blue) –

11. Phloem (red) –

Review:

1. List the four major macromolecules and the hints used to recognize them here:

2. Name these molecules:

3. a. Identify the molecule pictured at right.

b. How did you determine what this molecule it is?

4. a. Identify the molecule pictured at the right?

b. How did you determine what this molecule is?

5. Why do living organisms need to consume proteins?

6. What is the ratio of oxygen to hydrogen in the sugars.

7. If I wanted to break a larger macromolecule into two smaller macromolecules, what would I need to do? What is that term called?

8. What is the type of bond between two amino acids called?

9. Explain in detail what happens when a peptide bond is formed between a Methionine and Alanine?

10. What is the difference between a light reaction and a dark reaction?

11. What cell part do plants have that aide in photosynthesis? List the different parts below and where dark reactions and light reactions take place in this part.

12. What vascular tissue transports the sugar in a plant?

13. What is the energy storing molecule in plants called?

14. Write the formula for photosynthesis (fill in the blanks):

______+ ______+ ______+ ______

15. Label all parts of this diagram: