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IGCSE Biology Extended6.2.3—Structures listed in 6.2.2 adaptTopic Practice

6.2.3—Structures listed in 6.2.2 adapt

• Explain how the structures listed in 6.2.2 adapt leaves for photosynthesis

Question 1(b)

[Maximum number: 6]

Fig. 1.1 is a diagram of part of a cross-section of a leaf.

Fig. 1.1

Fig. 1.1

Explain how layer B and layer C in Fig. 1.1 are adapted for their functions.

Question 4

[Maximum number: 1]

The diagram shows a cross-section of part of a leaf.
Which type of cell carries out the most photosynthesis?

Question image

Question 2(a)

[Maximum number: 4]

Fig. 2.1 is a diagram of a cross-section of part of a leaf.

Fig. 2.1

Fig. 2.1

Identify and explain how the structures labelled J and K are adapted for photosynthesis. J

K

Question 2(c)

[Maximum number: 4]

The concentration of atmospheric carbon dioxide has increased considerably in recent years.

The scientists also made observations of the leaf structure of the soybean plants.

Epidermis and mesophyll tissues are adapted for photosynthesis.
Complete Table 2.1 by stating two structural features of each of these tissues and explain how each feature is an adaptation for photosynthesis.

Table 2.1

Table 2.1

Question 10

[Maximum number: 1]

The diagram shows part of a leaf in cross-section.

Question image

What shows the correct function of a numbered part?

part

functions

1

photosynthesis

2

gaseous exchange

3

transport of water from the root

4

transport of sugars to the root

Question 2(b)(ii)

[Maximum number: 3]

Fig. 2.1 is a photograph of some leaves of a water lily, which is a hydrophyte. The water lily has adaptive features that are found in many different hydrophytes.

Fig. 2.1

Fig. 2.1

Fig. 2.2 is a photomicrograph of a cross-section of a part of a water lily leaf.

Fig. 2.2

Fig. 2.2

Explain how part C in Fig. 2.2 adapts the hydrophyte for its environment.

Question 12

[Maximum number: 1]

The diagram shows a plant cell.

Question image

Which type of cell is shown?

A

cuticle cell

B

epidermal cell

C

palisade mesophyll cell

D

spongy mesophyll cell

Question 12

[Maximum number: 1]

The diagram shows the structure of cells from the leaf of a plant.

Question image

What type of cells are they?

A

epidermal cells

B

guard cells

C

palisade cells

D

spongy cells

Question 12

[Maximum number: 1]

How do the air spaces in the spongy mesophyll of a leaf help to adapt it for photosynthesis?

A

They act as a store of oxygen.

B

They allow carbon dioxide gas to diffuse through the leaf more rapidly.

C

They increase the surface area for absorption of light energy.

D

They let rainwater enter the leaf tissues.

Question 12

[Maximum number: 1]

The list shows features of a plant leaf.
1 air spaces between spongy mesophyll cells
2 chloroplasts in mesophyll cells
3 contains a natural insecticide
4 xylem vessels close to mesophyll cells
Which features are adaptations for photosynthesis?

A

1, 2 and 3

B

1, 2 and 4

C

1, 3 and 4

D

2, 3 and 4

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