GRAAD 12
NATIONAL
SENIOR CERTIFICATE
GRADE 12
LIFE SCIENCES P1
NOVEMBER 2023
MARKS: 150
TIME: 2½ hours
This question paper consists of 19 pages.
Copyright reserved Please turn over
,Life Sciences/P1 2 DBE/November 2023
NSC
INSTRUCTIONS AND INFORMATION
Read the following instructions carefully before answering the questions.
1. Answer ALL the questions.
2. Write ALL the answers in the ANSWER BOOK.
3. Start the answers to EACH question at the top of a NEW page.
4. Number the answers correctly according to the numbering system used in this
question paper.
5. Present your answers according to the instructions of each question.
6. Do ALL drawings in pencil and label them in blue or black ink.
7. Draw diagrams, tables or flow charts only when asked to do so.
8. The diagrams in this question paper are NOT necessarily drawn to scale.
9. Do NOT use graph paper.
10. You must use a non-programmable calculator, protractor and a compass,
where necessary.
11. Write neatly and legibly.
Copyright reserved Please turn over
, Life Sciences/P1 3 DBE/November 2023
NSC
SECTION A
QUESTION 1
1.1 Various options are provided as possible answers to the following questions.
Choose the answer and write only the letter (A–D) next to the question
numbers (1.1.1 to 1.1.10) in the ANSWER BOOK, e.g. 1.1.11 D.
1.1.1 Which ONE of the following parts controls the amount of light
entering the eye by influencing the size of the pupil?
A Sclera
B Cornea
C Retina
D Iris
1.1.2 The function of the umbilical vein is to transport …
A carbon dioxide from the foetus to the mother.
B nutrients from the foetus to the mother.
C carbon dioxide from the mother to the foetus.
D nutrients from the mother to the foetus.
1.1.3 The diagram below represents the events that occur during the
homeostatic control of blood glucose.
Level of Gland X Level of Level of
glucose in detects hormone Y glucose in
blood the increases blood
decreases change increases
Which ONE of the following represents gland X and hormone Y?
Gland X Hormone Y
A Pancreas Glucagon
B Pituitary Glucagon
C Pancreas Insulin
D Pituitary Insulin
1.1.4 Which ONE of the following is CORRECT regarding the
homeostatic control of the carbon dioxide concentration in the
blood?
A The lungs have receptors.
B High oxygen levels is the stimulus.
C Breathing muscles are the effectors.
D The process is controlled by the cerebrum.
Copyright reserved Please turn over
NATIONAL
SENIOR CERTIFICATE
GRADE 12
LIFE SCIENCES P1
NOVEMBER 2023
MARKS: 150
TIME: 2½ hours
This question paper consists of 19 pages.
Copyright reserved Please turn over
,Life Sciences/P1 2 DBE/November 2023
NSC
INSTRUCTIONS AND INFORMATION
Read the following instructions carefully before answering the questions.
1. Answer ALL the questions.
2. Write ALL the answers in the ANSWER BOOK.
3. Start the answers to EACH question at the top of a NEW page.
4. Number the answers correctly according to the numbering system used in this
question paper.
5. Present your answers according to the instructions of each question.
6. Do ALL drawings in pencil and label them in blue or black ink.
7. Draw diagrams, tables or flow charts only when asked to do so.
8. The diagrams in this question paper are NOT necessarily drawn to scale.
9. Do NOT use graph paper.
10. You must use a non-programmable calculator, protractor and a compass,
where necessary.
11. Write neatly and legibly.
Copyright reserved Please turn over
, Life Sciences/P1 3 DBE/November 2023
NSC
SECTION A
QUESTION 1
1.1 Various options are provided as possible answers to the following questions.
Choose the answer and write only the letter (A–D) next to the question
numbers (1.1.1 to 1.1.10) in the ANSWER BOOK, e.g. 1.1.11 D.
1.1.1 Which ONE of the following parts controls the amount of light
entering the eye by influencing the size of the pupil?
A Sclera
B Cornea
C Retina
D Iris
1.1.2 The function of the umbilical vein is to transport …
A carbon dioxide from the foetus to the mother.
B nutrients from the foetus to the mother.
C carbon dioxide from the mother to the foetus.
D nutrients from the mother to the foetus.
1.1.3 The diagram below represents the events that occur during the
homeostatic control of blood glucose.
Level of Gland X Level of Level of
glucose in detects hormone Y glucose in
blood the increases blood
decreases change increases
Which ONE of the following represents gland X and hormone Y?
Gland X Hormone Y
A Pancreas Glucagon
B Pituitary Glucagon
C Pancreas Insulin
D Pituitary Insulin
1.1.4 Which ONE of the following is CORRECT regarding the
homeostatic control of the carbon dioxide concentration in the
blood?
A The lungs have receptors.
B High oxygen levels is the stimulus.
C Breathing muscles are the effectors.
D The process is controlled by the cerebrum.
Copyright reserved Please turn over
