GRADE 12
LIFE SCIENCES
PAPER 1
CONDENSED EXAM REVISION NOTES
South African CAPS / NSC
Topics covered
• Reproduction in vertebrates
• Human reproduction
• Responding to the environment (humans)
• Endocrine system and homeostasis in humans
• Responding to the environment (plants)
Definitions • Processes • Comparisons • Exam reminders • Practice questions
A focused revision resource to use with your prescribed textbook, class notes and current examination instructions.
Grade 12 Life Sciences | Paper 1 Revision Page 1
, CONTENTS
Section Topic
1 Paper 1 scope and exam structure
2 Reproduction in vertebrates
3 Human reproduction
4 Responding to the environment: humans
5 Endocrine system and homeostasis
6 Responding to the environment: plants
7 High-value comparisons and key terms
8 Exam technique and practice questions
Scope note: These notes follow the CAPS-amended Grade 12 Paper 1 topic distribution. Meiosis is assessed in Paper 2 in the
amended distribution, although it is useful background for understanding gamete formation and human reproduction. Check your
teacher's final scope and the latest DBE examination instructions.
1. PAPER 1 SCOPE AND EXAM STRUCTURE
The NSC Life Sciences examination has two papers. Paper 1 is 150 marks and 2½ hours. The CAPS-amended format uses
Section A for short-answer questions (50 marks) and Section B for structured questions (100 marks).
Paper 1 topic Guideline weighting Approx. marks
Reproduction in vertebrates 5% 8
Human reproduction 27% 41
Responding to the environment (humans) 36% 54
Responding to the environment (plants) 9% 13
Endocrine system and homeostasis (humans) 23% 34
TOTAL 100% 150
The marks shown are guideline weightings, not a promise of the exact marks in every examination. Topic emphasis may vary
slightly between examination sessions.
Paper 1 study priority: Responding to the environment in humans and human reproduction carry the largest guideline
weightings. Do not omit the smaller topics: they can still provide accessible marks.
2. REPRODUCTION IN VERTEBRATES
2.1 Reproductive strategies
Reproductive strategies are adaptations that increase the chance that offspring survive and that a species reproduces
successfully in its environment.
Strategy Meaning Example / significance
External fertilisation Fusion of gametes outside the female's body, usually in Many fish and amphibians; many gametes are released
water. because fertilisation and survival are less certain.
Internal fertilisation Fusion of gametes inside the female's reproductive tract. Reptiles, birds and mammals; protects gametes and
increases the likelihood of fertilisation.
Ovipary Eggs are laid; embryo develops outside the mother's Birds; embryo receives nutrients from yolk.
body.
Ovovivipary Eggs are retained inside the parent; embryo is nourished Some sharks and snakes; eggs are protected inside the
mainly by yolk, not a placenta. parent.
Vivipary Embryo develops inside the mother and receives Most mammals; greater protection and nourishment.
nourishment from her, commonly via a placenta in
mammals.
Grade 12 Life Sciences | Paper 1 Revision Page 2
LIFE SCIENCES
PAPER 1
CONDENSED EXAM REVISION NOTES
South African CAPS / NSC
Topics covered
• Reproduction in vertebrates
• Human reproduction
• Responding to the environment (humans)
• Endocrine system and homeostasis in humans
• Responding to the environment (plants)
Definitions • Processes • Comparisons • Exam reminders • Practice questions
A focused revision resource to use with your prescribed textbook, class notes and current examination instructions.
Grade 12 Life Sciences | Paper 1 Revision Page 1
, CONTENTS
Section Topic
1 Paper 1 scope and exam structure
2 Reproduction in vertebrates
3 Human reproduction
4 Responding to the environment: humans
5 Endocrine system and homeostasis
6 Responding to the environment: plants
7 High-value comparisons and key terms
8 Exam technique and practice questions
Scope note: These notes follow the CAPS-amended Grade 12 Paper 1 topic distribution. Meiosis is assessed in Paper 2 in the
amended distribution, although it is useful background for understanding gamete formation and human reproduction. Check your
teacher's final scope and the latest DBE examination instructions.
1. PAPER 1 SCOPE AND EXAM STRUCTURE
The NSC Life Sciences examination has two papers. Paper 1 is 150 marks and 2½ hours. The CAPS-amended format uses
Section A for short-answer questions (50 marks) and Section B for structured questions (100 marks).
Paper 1 topic Guideline weighting Approx. marks
Reproduction in vertebrates 5% 8
Human reproduction 27% 41
Responding to the environment (humans) 36% 54
Responding to the environment (plants) 9% 13
Endocrine system and homeostasis (humans) 23% 34
TOTAL 100% 150
The marks shown are guideline weightings, not a promise of the exact marks in every examination. Topic emphasis may vary
slightly between examination sessions.
Paper 1 study priority: Responding to the environment in humans and human reproduction carry the largest guideline
weightings. Do not omit the smaller topics: they can still provide accessible marks.
2. REPRODUCTION IN VERTEBRATES
2.1 Reproductive strategies
Reproductive strategies are adaptations that increase the chance that offspring survive and that a species reproduces
successfully in its environment.
Strategy Meaning Example / significance
External fertilisation Fusion of gametes outside the female's body, usually in Many fish and amphibians; many gametes are released
water. because fertilisation and survival are less certain.
Internal fertilisation Fusion of gametes inside the female's reproductive tract. Reptiles, birds and mammals; protects gametes and
increases the likelihood of fertilisation.
Ovipary Eggs are laid; embryo develops outside the mother's Birds; embryo receives nutrients from yolk.
body.
Ovovivipary Eggs are retained inside the parent; embryo is nourished Some sharks and snakes; eggs are protected inside the
mainly by yolk, not a placenta. parent.
Vivipary Embryo develops inside the mother and receives Most mammals; greater protection and nourishment.
nourishment from her, commonly via a placenta in
mammals.
Grade 12 Life Sciences | Paper 1 Revision Page 2
