AS Level Biology A
H020/02 Depth in biology
Practice Question Paper
Date – Morning/Afternoon
Time allowed: 1 hour 30 minutes
You must have:
Ruler (cm/mm)
You may use:
• a scientific calculator
* 0 0 0 0 0 0 *
First name
Last name
Centre Candidate
number number
INSTRUCTIONS
• Use black ink. HB pencil may be used for graphs and diagrams only.
• Complete the boxes above with your name, centre number and candidate number.
• Answer all the questions.
• Write your answer to each question in the space provided.
• Additional paper may be used if required but you must clearly show your candidate
number, centre number and question number(s).
• Do not write in the bar codes.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended responses will be assessed in questions marked with an asterisk (*).
• This document consists of 18 pages.
© OCR 2015 H020/02
[…/…/…] DC (…) Turn over
, 2
Answer all the questions.
1 Evolution is the change of species over time. Natural selection is the mechanism by which this change
occurs.
(a) Fig. 1.1 shows two species of trilobites, a group of arthropods that became extinct about 240 million
years ago. Species A is 20 million years older than species B.
Thorax Thorax
Head Head
Segments
Segments
Tail
Anterior
Tail
spine
Lateral spine Lateral spine
Species A Species B
Fig 1.1
(i) Explain how scientists are able to estimate the age of extinct organisms, such as species A and
species B.
……………………………………………………………………………………………….
……………………………………………………………………………………………….
……………………………………………………………………………………………….
…………………………………………………………………………………………. [2]
(ii) Identify two features visible in both species that suggest that species A and species B evolved
from a relatively close common ancestor.
1……………………………………………………
2……………………………………………………
[1]
© OCR 2015 H020/02
, 3
(iii) A student used Fig. 1.1 to make a number of observations comparing species A and B.
One such observation was “species B had longer lateral spines than species A”.
Explain why this is not a valid observation to make on the basis of Fig. 1.1.
…………………………………………………………………………………………
…………………………………………………………………………………………
………………………………………………………………………………………… [2]
(iv) Fig. 1.2 shows two modern arthropods.
C
D
Fig. 1.2
Modern species C and D live in water. The trilobite species, A and B also lived in water.
Identify and briefly explain an adaptation present in all four species, A, B, C and D, that would
be advantageous for an organism that lives in water.
Adaptation ……………………………………………………………………………
Explanation ……………………………………………………………………………
[1]
© OCR 2015 H020/02
Turn over
H020/02 Depth in biology
Practice Question Paper
Date – Morning/Afternoon
Time allowed: 1 hour 30 minutes
You must have:
Ruler (cm/mm)
You may use:
• a scientific calculator
* 0 0 0 0 0 0 *
First name
Last name
Centre Candidate
number number
INSTRUCTIONS
• Use black ink. HB pencil may be used for graphs and diagrams only.
• Complete the boxes above with your name, centre number and candidate number.
• Answer all the questions.
• Write your answer to each question in the space provided.
• Additional paper may be used if required but you must clearly show your candidate
number, centre number and question number(s).
• Do not write in the bar codes.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended responses will be assessed in questions marked with an asterisk (*).
• This document consists of 18 pages.
© OCR 2015 H020/02
[…/…/…] DC (…) Turn over
, 2
Answer all the questions.
1 Evolution is the change of species over time. Natural selection is the mechanism by which this change
occurs.
(a) Fig. 1.1 shows two species of trilobites, a group of arthropods that became extinct about 240 million
years ago. Species A is 20 million years older than species B.
Thorax Thorax
Head Head
Segments
Segments
Tail
Anterior
Tail
spine
Lateral spine Lateral spine
Species A Species B
Fig 1.1
(i) Explain how scientists are able to estimate the age of extinct organisms, such as species A and
species B.
……………………………………………………………………………………………….
……………………………………………………………………………………………….
……………………………………………………………………………………………….
…………………………………………………………………………………………. [2]
(ii) Identify two features visible in both species that suggest that species A and species B evolved
from a relatively close common ancestor.
1……………………………………………………
2……………………………………………………
[1]
© OCR 2015 H020/02
, 3
(iii) A student used Fig. 1.1 to make a number of observations comparing species A and B.
One such observation was “species B had longer lateral spines than species A”.
Explain why this is not a valid observation to make on the basis of Fig. 1.1.
…………………………………………………………………………………………
…………………………………………………………………………………………
………………………………………………………………………………………… [2]
(iv) Fig. 1.2 shows two modern arthropods.
C
D
Fig. 1.2
Modern species C and D live in water. The trilobite species, A and B also lived in water.
Identify and briefly explain an adaptation present in all four species, A, B, C and D, that would
be advantageous for an organism that lives in water.
Adaptation ……………………………………………………………………………
Explanation ……………………………………………………………………………
[1]
© OCR 2015 H020/02
Turn over
