grade 12 assignment 2023 term 3 life sciences

Life Sciences Grade 12 Term 3 Assignment Questions and Answers

Life Sciences Grade 12 Term 3 Assignment Evolution Questions and Answers:

This section provides comprehensive questions and answers for the Life Sciences Grade 12 Term 3 Assignment . The topics covered include:

• The Code of Life
• Reproduction
• Responding to the Environment: Humans
• Endocrine System and Homeostasis
• Response to the Environment: Plants

Life Sciences Grade 12 Term 3 Assignment Memorandum 2024

Below you will find the 2024 Life Sciences Grade 12 Term 3 Assignment questions and the answer guide (just to give learners direction):

Questions and answers:

Seahorses: Unique Reproductive Strategy

Scenario: Seahorses are fascinating creatures where the male undergoes pregnancy and gives birth to young seahorses. The male seahorse has a pouch on its stomach where the eggs, deposited by the female, are fertilised and cared for until they hatch. The male provides oxygen and nutrients to the developing embryos through the pouch, a role analogous to the placenta in humans.

3What type of fertilisation does the seahorse have? (1)

Answer: The seahorse exhibits internal fertilisation .

Explanation: This means that the fertilisation of the eggs occurs within the male seahorse’s body. After the female deposits her eggs into the male’s pouch, the sperm from the male fertilises the eggs inside this pouch, rather than outside in the external environment.

Explain your answer to QUESTION 3.1. (1)

Answer: The seahorse undergoes internal fertilisation because the eggs are directly deposited into the male’s pouch by the female, where the sperm fertilises them within the male’s body.

Elaboration: Unlike external fertilisation, where eggs and sperm meet outside the body (as seen in many aquatic species like fish), seahorses have a specialised reproductive strategy. The female seahorse transfers her eggs directly into the male’s brood pouch. This internal environment provides protection and optimal conditions for the fertilisation process, ensuring that the sperm effectively fertilises the eggs within the secure confines of the pouch.

Why is the seahorse reproductive strategy considered to be ovovivipary? (2)

Answer: The seahorse’s reproductive strategy is classified as ovovivipary because the embryos develop inside eggs that remain within the male’s pouch until they hatch, with the young being born live.

Elaboration: Ovoviviparous organisms are those where the embryos develop inside eggs that stay within the parent’s body until they are ready to hatch. In the case of seahorses, the male carries the eggs in his pouch, where they are fertilised and develop into embryos. During their development, the embryos receive nutrients and oxygen through the walls of the pouch, similar to how a placenta functions in mammals, although the actual nourishment comes from the egg yolk rather than directly from the male. Once the embryos are fully developed, they hatch inside the pouch, and the male gives birth to live young, making this process a clear example of ovoviviparity.

Downloadable Assignments pdf docs:

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Exam Papers and Study Notes for grade 10 ,11 and 12

Life Sciences(Grade 12)

Past year exam papers.

(updated 2024/07/04)

 KZN   Step Ahead 2024  Learner and Teacher  in    Study Notes

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 EASY TO SCORE P2

KZN  March  QP and Memo

NSC  May /June P1 and Memo

NSC May/June  P2 and Memo

KZN June  QP and Memo

NC  June  QP and Memo

EC  June  QP and Memo

KZN SEPT P1 and Memo

March  QP and Memo

NSC May/June  P1 and Memo

EC June  QP and Memo

LP Pre June QP and Memo

KZN  Pre June QP and Memo

GP  June  QP and Memo

Assignment TERM 3  & Memo

FS SEPT  P2  and Memo

NW  SEPT P2  and Memo

KZN  SEPT  P1 and Memo

KZN  SEPT  P2 and Memo

GP SEPT P1 only

NSC NOV  P1 and Memo

NSC  NOV  P2 and Memo  

March QP and Memo  

NSC May/June P1 and Memo

NSC May/June P2 and Memo

June QP and Memo  

FS  SEPT  P1 and Memo

FS SEPT   P2 and Memo  

KZN SEPT  P1 and Memo  

KZN SEPT  P2 and Memo

EC SEPT  P1 and Memo

EC SEPT P2 and Memo

LP  SEPT   P1 and Memo

LP SEPT  P2 and Memo

GP  SEPT   P1 and Memo

GP  SEPT P2 and Memo

MP SEPT P1 and Memo

MP SEPT  P2 and Memo

WC SEPT  P2 and Memo

NSC NOV P1 and Memo

NSC NOV P2 and Memo

KZN April  QP and memo  

NSC June  P1 and MEMO

NSC June  P2 and MEMO

KZN June QP and Memo 

EC Exemplar June  QP and Memo

KZN Trial P1 and Memo

 KZN Trial P2 and Memo

GP  Trial P1 and Memo

GP  Trial  P2 and Memo

LP Trial P2 and Memo

NSC NOV P1 and Memo  

March QP and Memo

June  QP and Memo    

SEPT   P1 and Memo    

SEPT  P2  and Memo

NOV  P1  and Memo

NOV  P2  and Memo

MP    Pre Trial P1  & Memo

MP   Pre Trial  P2  &Memo

  March   QP + MEMO

June QP only

Trial Exam  P1 only    

Trial Exam P1  MEMO

Trial Exam  P2 only

Trial Exam P2 MEMO

NSC NOV  P1  QP- only

NSC NOV  P1   Memo

NSC Nov P2 -QP-only

NSC Nov P2 Memo

NSC Suppl  P2   only

NSC Suppl  P2_Memo

  NSC Suppl  P1  – only

NSC Suppl   P1_Memo

NSC Feb-March   P2 + MEMO

MARCH – QP+MEMO

JUNE – QP+MEMO

SEPT – P1 – QP+MEMO

SEPT – P2 – QP+MEMO

NOV – P1 – QP ONLY

NOV – P2 – QP ONLY

JUNE  QP + MEMO

SEPT  P1  +MEMO

SEPT   P2  +MEMO

NOV   P1 only

NOV  P2  only

 Nov P1  Memo

 Nov  P2  Memo

MAR – QP + MEMO

JUNE – QP + MEMO

SEPT  P1  + MEMO

 SEPT   P2   + MEMO

NOV  P1 – QP

 NOV  P2 – QP

 MARCH  QP + MEMO

 JUNE  QP + MEMO

TRIALS  P1   + MEMO

TRIALS  P2  + MEMO

 NOV  P1   ONLY

 NOV  P2  ONLY

NOV  P1  MEMO

NOV  P2  MEMO

STUDY NOTES

 LESSON PLANS 2021

Life Sciences Essay(Gr 10-12)

Life Sc. Revision(Gr 12)

Life Science Resource

Click on  button below to download Zip File.

(d.o.e  papers from 2012 to 2017 supplementary and final exam),   doe exam papers 2012 to 2017.

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Evolution Grade 12 Term 3 Revision Notes: Life Sciences

Evolution Grade 12 Revision Notes for Term 3: Life Sciences: for assignments, exams and tests.

The theory of evolution has been developed over many years by many different scientists and is regarded as a scientific theory since various hypotheses relating to evolution have been tested and verified over time.

What is Evolution?

The word evolution simply means change over time. Evolution is the process by which organisms develop over time from earlier forms. Biological evolution refers to any genetic change in a population that is inherited and becomes a characteristic of that population over several generations.

Watch Video Lesson: Evolution: Life Sciences Grade 12

Key Terminologies in Evolution Section for Grade 12 Learners to know

• biological evolution : any genetic change in a population that is inherited over several generations
• biological species : a group of organisms with similar characteristics that interbreed with one another to produce fertile offspring
• population : a group of individuals of the same species occupying a particular habitat
• punctuated equilibrium : evolution characterised by long periods of little or no change followed by short periods of rapid change
• natural selection : mechanism of evolution – organisms survive if they have characteristics that make them suited to the environment
• artificial selection : human-driven selective force, e.g. breeding of plants and animals to produce desirable traits
• inbreeding : mating of individuals that are closely related
• outbreeding : mating of individuals that are not closely related
• speciation : the formation of a new species
• geographic speciation : formation of a new species when the parent population separated by a geographical barrier

Grade 12 Evolution Notes pdf Downloads

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GRADE 12 LIFE SCIENCES TERM-3 TASK / ASSIGNMENT AND MEMORANDUM

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GRADE 12 LIFE SCIENCES TERM-3 TASK / ASSIGNMENT

OUT OF 50 MARKS AND ADVISED DURATION IS 50 MINUTES

MEMORANDUM IS AVAILABLE.

BOTH PAPERS ARE IN WORD FORMAT.

TOPICS: HUMAN ENDOCRINE SYSTEM, HOMEOSTASIS, PLANT RESPONSES TO THE ENVIRONMENT.

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