2.

2 Size of specimen 1
9

2 (a) Fig. 2.1 is a photograph of a lizard.

C D

magnification ×0.6

Fig. 2.1

Line CD represents the length of the lizard.

Measure the length of line CD on Fig. 2.1.

length of line CD ................................................ mm

Calculate the actual length of the lizard using the formula and your measurement.

length of line CD
magnification =
actual length of the lizard

Give your answer to three significant figures.

Space for working.

......................................................... mm
[3]

© UCLES 2023 0610/61/O/N/23 [Turn over

2.2 Size of specimen 2
7

2 (a) Fig. 2.1 is a photograph of the largest butterfly in the world, the Queen Alexandra’s birdwing
butterfly.

E F

magnification ×0.3

Fig. 2.1

(i) Line EF represents the wingspan of the Queen Alexandra’s birdwing butterfly.

Measure the length of line EF on Fig. 2.1.

length of line EF............................................. mm

Calculate the actual wingspan of the butterfly using the formula and your measurement.

length of line EF
magnification =
actual wingspan of the butterfly

Give your answer to two significant figures.

Space for working.

......................................................... mm
[3]

© UCLES 2022 0610/61/O/N/22 [Turn over

2.2 Size of specimen 3
10

(d) Fig. 2.1 is a photomicrograph of a section through a bronchiole in a human lung.

magnification ×130

Fig. 2.1

(i) Line PQ represents the width of the bronchiole.

Measure the length of line PQ on Fig. 2.1.

length of line PQ ............................................... mm

Calculate the actual width of the bronchiole using the formula and your measurement.
length of line PQ
magnification = actual width of the bronchiole

Give your answer to two significant figures.

Space for working.

......................................................... mm
[3]
© UCLES 2023 0610/62/F/M/23
2.2 Size of specimen 4
8

(ii) Fig. 2.2 shows a cross-section of a whole marram grass leaf.

Q
P

magnification ×120

Fig. 2.2

Measure the length of line PQ on Fig. 2.2.

length of line PQ ................................................ mm

Calculate the actual diameter of the marram grass leaf using the formula and your
measurement.

length of line PQ on Fig. 2.2

magnification =
actual diameter of the marram grass leaf

Give your answer to one decimal place.

Space for working.

......................................................... mm
[3]
© UCLES 2022 0610/61/M/J/22