STRUCTURE OF A LEAF

Question 1

What is the purpose of the waxy cuticle in a leaf?

Answer 1

Prevents water loss
The waxy cuticle is a protective layer that helps maintain moisture within the leaf.

Question 2

What is the role of the upper epidermis in a leaf structure?

Answer 2

Thin and transparent; allows light to enter the palisade layer
The upper epidermis is crucial for light penetration while providing protection.

Question 3

Describe the palisade layer of a leaf.

Answer 3

Column shape, tightly packed, many chloroplasts
The palisade layer is where most photosynthesis occurs due to the high concentration of chloroplasts.

Question 4

What is the function of the spongy layer in a leaf?

Answer 4

Contains air spaces that increase surface area to volume ratio (SA:V)
The spongy layer makes gas exchange possible within the leaf.

Question 5

What structures are found in the lower epidermis of a leaf?

Answer 5

Guard cells and stomata
These structures are essential for regulating gas exchange and water loss.

Question 6

What is the function of guard cells?

Answer 6

Controls stomata for gas diffusion
Guard cells regulate the opening and closing of stomata based on environmental conditions.

Question 7

When are stomata typically open?

Answer 7

Open in day

Question 8

When do stomata typically close?

Answer 8

Closed at night
Closing stomata at night helps prevent water loss when photosynthesis is not occurring.

Question 9

What are the two components of a vascular bundle in a leaf?

Answer 9

Xylem (top) and phloem (bottom)
Xylem transports water and minerals, while phloem transports sugars and nutrients.

Question 10

Fill in the blank: The _______ layer of a leaf is where most chloroplasts are found.

Answer 10

Palisade

Question 11

True or False: The spongy layer is primarily responsible for photosynthesis.

Answer 11

False
The palisade layer is mainly responsible for photosynthesis, while the spongy layer aids in gas exchange.