Question

science 10 assignment b3
name:

1. fill in the following diagram.

leaf structure
(1)
(2)
(3)
(4)
(5)
(7)
(8)
(6)
(9)
(10)
(11)
(12)

1. list five general functions a leaf performs for a plant.

Explanation:

Part 1: Filling the Leaf Structure Diagram (Typical Leaf Structure Labels, assuming standard plant anatomy)

Step 1: Identify each part (1 - 12)

1. Upper Epidermis: Outer protective layer on the top of the leaf.
2. Palisade Mesophyll: Layer of elongated cells with many chloroplasts for photosynthesis.
3. Spongy Mesophyll: Loosely packed cells with air spaces for gas exchange.
4. Lower Epidermis: Outer protective layer on the bottom of the leaf.
5. Cuticle: Waxy layer on the epidermis to prevent water loss.
6. Guard Cell: Cells surrounding stomata, control opening/closing.
7. Stoma (Stomate): Pore for gas exchange (CO₂ in, O₂ out, water vapor out).
8. Chloroplast: Organelle for photosynthesis (contains chlorophyll).
9. Xylem: Vascular tissue that transports water and minerals to the leaf.
10. Phloem: Vascular tissue that transports sugars (products of photosynthesis) away from the leaf.
11. Vascular Bundle (Veins): Contains xylem and phloem, supports the leaf.
12. Air Space: In spongy mesophyll, allows gas movement.

Part 2: Five General Functions of a Leaf for a Plant

Step 1: Recall key plant leaf functions

1. Photosynthesis: Produces glucose (food) using sunlight, CO₂, and water.
2. Gas Exchange: Takes in CO₂ (for photosynthesis) and releases O₂ (via stomata); also releases water vapor (transpiration).
3. Transpiration: Evaporation of water from leaves, which helps pull water up from roots (water transport) and cools the plant.
4. Storage: Stores sugars, starches, or water (some succulent leaves).
5. Protection: May have spines, hairs, or toxins to deter herbivores (e.g., holly leaves).

Final Answers

1. Leaf Structure Diagram Labels (Sample Answers, based on standard anatomy):

1. Upper Epidermis
2. Palisade Mesophyll
3. Spongy Mesophyll
4. Lower Epidermis
5. Cuticle
6. Guard Cell
7. Stoma (Stomate)
8. Chloroplast
9. Xylem
10. Phloem
11. Vascular Bundle (Vein)
12. Air Space

2. Five Leaf Functions:

1. Photosynthesis (produces food for the plant).
2. Gas Exchange (takes in CO₂, releases O₂ and water vapor).
3. Transpiration (regulates water movement and cools the plant).
4. Storage (of nutrients like sugars or water).
5. Protection (against pests/damage via physical or chemical defenses).

Answer:

Part 1: Filling the Leaf Structure Diagram (Typical Leaf Structure Labels, assuming standard plant anatomy)

Step 1: Identify each part (1 - 12)

1. Upper Epidermis: Outer protective layer on the top of the leaf.
2. Palisade Mesophyll: Layer of elongated cells with many chloroplasts for photosynthesis.
3. Spongy Mesophyll: Loosely packed cells with air spaces for gas exchange.
4. Lower Epidermis: Outer protective layer on the bottom of the leaf.
5. Cuticle: Waxy layer on the epidermis to prevent water loss.
6. Guard Cell: Cells surrounding stomata, control opening/closing.
7. Stoma (Stomate): Pore for gas exchange (CO₂ in, O₂ out, water vapor out).
8. Chloroplast: Organelle for photosynthesis (contains chlorophyll).
9. Xylem: Vascular tissue that transports water and minerals to the leaf.
10. Phloem: Vascular tissue that transports sugars (products of photosynthesis) away from the leaf.
11. Vascular Bundle (Veins): Contains xylem and phloem, supports the leaf.
12. Air Space: In spongy mesophyll, allows gas movement.

Part 2: Five General Functions of a Leaf for a Plant

Step 1: Recall key plant leaf functions

1. Photosynthesis: Produces glucose (food) using sunlight, CO₂, and water.
2. Gas Exchange: Takes in CO₂ (for photosynthesis) and releases O₂ (via stomata); also releases water vapor (transpiration).
3. Transpiration: Evaporation of water from leaves, which helps pull water up from roots (water transport) and cools the plant.
4. Storage: Stores sugars, starches, or water (some succulent leaves).
5. Protection: May have spines, hairs, or toxins to deter herbivores (e.g., holly leaves).

Final Answers

1. Leaf Structure Diagram Labels (Sample Answers, based on standard anatomy):

1. Upper Epidermis
2. Palisade Mesophyll
3. Spongy Mesophyll
4. Lower Epidermis
5. Cuticle
6. Guard Cell
7. Stoma (Stomate)
8. Chloroplast
9. Xylem
10. Phloem
11. Vascular Bundle (Vein)
12. Air Space

2. Five Leaf Functions:

1. Photosynthesis (produces food for the plant).
2. Gas Exchange (takes in CO₂, releases O₂ and water vapor).
3. Transpiration (regulates water movement and cools the plant).
4. Storage (of nutrients like sugars or water).
5. Protection (against pests/damage via physical or chemical defenses).