Centre Candidate
Surname
Number Number
First name(s) 2
GCE A LEVEL
S25-A400U20-1
A400U20-1
FRIDAY, 13 JUNE 2025 – MORNING
BIOLOGY – A level component 2
Continuity of Life
2 hours For Examiner’s use only
Maximum Mark
Question
Mark Awarded
1. 8
2. 18
A 40 0U201
3. 17
01
4. 13
5. 24
6. 11
7. 9
Total 100
ADDITIONAL MATERIALS
A calculator and a ruler.
INSTRUCTIONS TO CANDIDATES
Use black ink or black ball-point pen. Do not use gel pen or correction fluid.
You may use a pencil for graphs and diagrams only.
Write your name, centre number and candidate number in the spaces at the top of this page.
Answer all questions.
Write your answers in the spaces provided in this booklet. If you run out of space, use the
additional page(s) at the back of the booklet, taking care to number the question(s) correctly.
INFORMATION FOR CANDIDATES
The number of marks is given in brackets at the end of each question or part-question.
The assessment of the quality of extended response (QER) will take place in question 7.
The quality of written communication will affect the awarding of marks.
JUN25A400U20101 © WJEC CBAC Ltd. BE/GR*(X24-A400U20-1)
, 2
Examiner
only
Answer all questions.
1. Image 1.1 shows a front view of the female reproductive system.
Image 1.1
A
C
D
B
E
(a) Using some of the letters A–E from Image 1.1 complete Table 1.2 to identify the site of
the following processes. Letters may be used once, more than once or not at all. [3]
Table 1.2
Letter
Sperm is normally deposited during sexual intercourse
Fertilisation of the ovum normally occurs
The blastocyst normally implants
The placenta normally forms
02 © WJEC CBAC Ltd. (A400U20-1)
, 3
Examiner
only
(b) During breastfeeding, the baby feeds on milk from the mammary glands. Image 1.3
shows the site of the action of two hormones involved in the control of lactation.
Image 1.3
anterior
pituitary
gland
posterior
pituitary
pituitary
gland gland
hormone X
hormone Y
release
of milk
A 40 0U201
03
(i) Hormone X stimulates the production of milk by the mammary glands.
Hormone Y stimulates the release of milk from the breast. It also stimulates the
contraction of the uterine wall during birth.
Name hormones X and Y. [2]
X ........................................................
Y ........................................................
(ii)
When the baby starts to feed from the mother there is increased secretion of
these two hormones.
Suggest how this is an example of positive feedback. [1]
03 © WJEC CBAC Ltd. (A400U20-1) Turn over.
Surname
Number Number
First name(s) 2
GCE A LEVEL
S25-A400U20-1
A400U20-1
FRIDAY, 13 JUNE 2025 – MORNING
BIOLOGY – A level component 2
Continuity of Life
2 hours For Examiner’s use only
Maximum Mark
Question
Mark Awarded
1. 8
2. 18
A 40 0U201
3. 17
01
4. 13
5. 24
6. 11
7. 9
Total 100
ADDITIONAL MATERIALS
A calculator and a ruler.
INSTRUCTIONS TO CANDIDATES
Use black ink or black ball-point pen. Do not use gel pen or correction fluid.
You may use a pencil for graphs and diagrams only.
Write your name, centre number and candidate number in the spaces at the top of this page.
Answer all questions.
Write your answers in the spaces provided in this booklet. If you run out of space, use the
additional page(s) at the back of the booklet, taking care to number the question(s) correctly.
INFORMATION FOR CANDIDATES
The number of marks is given in brackets at the end of each question or part-question.
The assessment of the quality of extended response (QER) will take place in question 7.
The quality of written communication will affect the awarding of marks.
JUN25A400U20101 © WJEC CBAC Ltd. BE/GR*(X24-A400U20-1)
, 2
Examiner
only
Answer all questions.
1. Image 1.1 shows a front view of the female reproductive system.
Image 1.1
A
C
D
B
E
(a) Using some of the letters A–E from Image 1.1 complete Table 1.2 to identify the site of
the following processes. Letters may be used once, more than once or not at all. [3]
Table 1.2
Letter
Sperm is normally deposited during sexual intercourse
Fertilisation of the ovum normally occurs
The blastocyst normally implants
The placenta normally forms
02 © WJEC CBAC Ltd. (A400U20-1)
, 3
Examiner
only
(b) During breastfeeding, the baby feeds on milk from the mammary glands. Image 1.3
shows the site of the action of two hormones involved in the control of lactation.
Image 1.3
anterior
pituitary
gland
posterior
pituitary
pituitary
gland gland
hormone X
hormone Y
release
of milk
A 40 0U201
03
(i) Hormone X stimulates the production of milk by the mammary glands.
Hormone Y stimulates the release of milk from the breast. It also stimulates the
contraction of the uterine wall during birth.
Name hormones X and Y. [2]
X ........................................................
Y ........................................................
(ii)
When the baby starts to feed from the mother there is increased secretion of
these two hormones.
Suggest how this is an example of positive feedback. [1]
03 © WJEC CBAC Ltd. (A400U20-1) Turn over.
