Worksheet 1.1

Interpreting an electron micrograph of a plant cell

This transmission electron micrograph (TEM) shows parts of two palisade cells from a leaf.

J

I

F

B H

G

AD

E 1.0 µm C

© Marilyn Schaller/SPL

Cambridge International AS and A Level Biology Teacher’s Resource © Cambridge University Press 2013 1

Worksheet 1.1

1 Identify the labelled structures and write a brief statement of their functions in the table below.

Label Name of structure Function

A

[3]

B

[3]

C

[2]

D

[2]

E

[3]

F

[3]

G

[3]

H

[2]

I

[2]

J

[2]

2 The horizontal line indicated on the electron micrograph represents 1.0 µm in length.

Calculate the magnification of the image. [2]

3 The structure labelled C is perforated by many pores. Explain the function of these pores. [3]

Total: 30

Score: %

Cambridge International AS and A Level Biology Teacher’s Resource © Cambridge University Press 2013 2