Life Sciences — Grade 12

DNA — The Code of Life

Every living thing on Earth uses the same molecule to store instructions for life: DNA. This unit teaches you about DNA — what it looks like, where it is found, how it copies itself, and how it controls what proteins your cells make.

Meiosis

Why do children from the same parents look different from each other? Why are you not an exact copy of your mother or father?

Reproduction in Vertebrates: Strategies for Survival

Why do fish lay thousands of eggs while elephants have only one calf every few years? Why do some snakes lay eggs while others give birth to live young?

Human Reproduction

This unit covers how humans reproduce. You will learn about the male and female reproductive systems, how sperm and egg cells are made, how hormones control the menstrual cycle, and what happens from fertilisation to birth.

Grade 12 Life Sciences Term 1 Revision

This revision unit covers the four main topics from Term 1:

Responding to the Environment — Humans: The Nervous System and Sensory Reception

Every moment, your body detects changes around you and responds to keep you safe. When you touch something hot, you pull your hand away before you even think about it. When a ball comes towards you, you catch it or duck. This all happens because of your nervous system — a network that sends messages through your body at incredible speed.

Human Endocrine System: Chemical Messengers of the Body

Your body has two main systems for sending messages: the nervous system (which you studied in Lesson 1) and the endocrine system. The nervous system sends fast electrical signals. The endocrine system sends slower chemical signals called hormones through your blood.

Homeostasis in Humans: Maintaining the Balance Within

Your body keeps its inside conditions steady, even when the outside world changes. This process is called homeostasis. It is essential for survival.

Responding to the Environment — Plants: Chemical Messengers and Survival Strategies

Plants cannot walk away from danger or move towards food. Instead, they use chemical messengers called hormones to control how they grow, develop, and defend themselves.

Grade 12 Life Sciences Term 2 Revision: Human and Plant Responses

This revision unit covers how humans and plants detect and respond to changes around them. You will revise:

Grade 12 Life Sciences Mid-Year Examination Prep

This unit prepares you for your Grade 12 Life Sciences mid-year examination. The exam covers all work from Terms 1 and 2.

Evolution by Natural Selection

Evolution by natural selection explains why there are so many different kinds of living things on Earth. It also explains why organisms fit their environments so well.

Human Evolution: Tracing Our African Origins

This unit explores the story of human evolution—a story that begins in Africa. South Africa holds some of the most important fossil evidence for understanding where modern humans came from.

Term 3 Revision: Evolution and Human Origins

This revision covers two connected topics: Evolution by Natural Selection and Human Evolution. These ideas explain how living things change over time and how humans fit into the story of life on Earth.

Grade 12 Life Sciences Trial Preliminary Examination Prep

This unit helps you prepare for your Grade 12 trial examinations. Trial exams cover all the work from Term 1 to Term 3. You will write two papers, each worth 150 marks and lasting 2.5 hours.

Grade 12 Life Sciences Term 4 Revision

This revision unit covers all the Grade 12 Life Sciences content you need for your NSC examinations. You have studied DNA, protein synthesis, meiosis, reproduction, the nervous and endocrine systems, homeostasis, plant responses, and evolution throughout the year. Now it is time to bring everything together, practise answering questions, and build your exam confidence.

Final NSC Examinations: Mastering Life Sciences Grade 12

The National Senior Certificate (NSC) examinations are your final Life Sciences tests in Grade 12. This unit helps you understand exactly how the exams work, revise the most important content, and build the skills to answer questions correctly under time pressure.