EduNinja
[Maximum number: 9]

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

Fig. 1.1

Fig. 1.1

(a)

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

[ 6 ]
(b)

A student placed a plant in a very hot room for 12 hours. There was a bright light in the room and the plant was not given any water during the 12-hour period.

Fig. 1.2 shows a series of sketches that the student made of the stomata during the investigation.

Fig. 1.2

Fig. 1.2

[ 3 ]
(i)

Identify the cell labelled D on Fig. 1.2.

[ 1 ]
(ii)

State the main function of the stomata.

[ 1 ]
(iii)

State the advantage to the plant of the change to the stomata shown in Fig. 1.2.

[ 1 ]
(a)

Fig. 1.1 is a diagram of an insect-pollinated flower.

Fig. 1.1

Fig. 1.1

[ 3 ]
(i)

Using the information in Fig. 1.1, complete Table 1.1.

Table 1.1

Table 1.1

[ 3 ]
[Maximum number: 1]

What are features of the leaves of a plant that is a dicotyledon?

broad leaves

parallel veins

key

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χ\boldsymbol{\chi}

χ=\boldsymbol{\chi}= no

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χ\boldsymbol{\chi}

[Maximum number: 1]

The diagram shows two guard cells.
Which label is correct?

Question image
[Maximum number: 1]

The diagram shows a palisade mesophyll cell from a green leaf.

Question image

In which labelled part does photosynthesis occur and where is starch stored?

photosynthesis

occurs

starch is

stored

X

W

X

Z

Y

X

Y

Y

(a)

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

[ 4 ]
[Maximum number: 4]

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

(a)

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

[ 4 ]
[Maximum number: 1]

The diagrams show the structure of four different cells from the leaf of a dicotyledonous plant.
Which cell is a guard cell?

Question image

NOT TO SCALE

[Maximum number: 1]

The diagram shows a cross-section through a leaf.

Question image

What is the cell labelled X ?

A

epidermis

B

guard cell

C

palisade mesophyll

D

spongy mesophyll

[Maximum number: 1]

Which region in the leaf of a green plant contains phloem?

A

palisade mesophyll

B

spongy mesophyll

C

upper epidermis

D

vascular bundle

0