life sciences grade 12 assignment 2023

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.

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LFSC Gr 12 Assignment LIM2023 QP ENG

Life science, nervous system, gekombineerde skool noorderlig - benoni.

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Senior certificate, time: 2 hours, this question paper consists of 10 pages including the cover page, life sciences assignment, 18 august 2023, instructions and information, read the following instructions carefully before answering the questions., 1. answer all the questions., 2. write all the answers in your 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. all drawings should be done in pencil and labelled in blue or black ink., 7. draw diagrams 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., 11. write neatly and legibly., 1. the progenitor of the contemporary horse exhibited significantly dissimilar foot, bone morphology. scientists postulate that the structural adaptation of the foot, bones occurred as the environment transitioned from swampy terrains with soft, mud to drier and firmer soils. this adaptive change enabled the animals to, maneuver efficiently within each distinct habitat., 1.3. describe two changes to the bones that have taken place over the past 50 million, 1.3 explain if the bones of horses in the diagram above can be used to support, lamarck theory of evolution, 1.3 describe how natural selection could have developed the arrangement of the foot, bones of eohippus to the arrangement of the foot bones of equus., eohippus mesohippus merychippus equus, 50 35 25 5 - million years ago, key: the shaded bones are the ones that touched the ground, ankle bones, 1. study the diagram below of the moth species that originally belonged to a single, population but was later separated by a mountain into two groups, 1.4 name the process which is illustrated in the diagram above ( 1 ), 1.4. explain the importance of the process you identified in question 1.4 above. ( 2 ), 1.4. why is species a the ancestor of species b and c ( 2 ), 1.4. explain the above illustrated process in relation to the three species indicated in, the diagram., total of question 1: 31, species b species c, 2. three populations of butterflies a, b and c live separately on three islands in the, ocean. the butterflies on island 2 and island 3 originated from island 1. the, islands experience strong prevailing winds from the north-west throughout the, year. populations a and b can interbreed and produce fertile offspring., population b can mate with population c, but the offspring are infertile. mating, does not occur between population a and c at all., 2.2 how many species are represented by the three populations ( 1 ), 2.2. use the information provided to explain how speciation might have taken place, in the above example., total question 2 25, total for evolution by natural selection 56, human evolution: 44 marks, 3. the diagram shows the skulls of two organisms; a human and a gorilla., 3.1 which organism (a or b), is bipedal for most of its adult life (1), 3. 2. tabulate two observable differences between the skull of organism a and b. ( 5 ), 3.1. name and explain three possible advantages of bipedalism for an organism. ( 6 ), 3. the diagram below shows the progression of human evolution. study the diagram, of some early hominin a, b, c, d and e which represent homo erectus, homo, sapiens, australopithecus, homo habilis and homo neanderthalensis, in no, particular order., 3.3 identify each of the above hominid members (a – e) correctly from the diagram, given above., 3.3. mention any three common characteristics which are shared by the members, represented in the above diagram., 3.3. supply any three characteristics that make the organism, labelled e different from, other primates., 3. fossil evidence is used to support the ‘out-of-africa’ hypothesis. describe how, fossil evidence is used to support the above-mentioned hypothesis., total for human evolution: 44, grandtotal: 100.

• Multiple Choice

Subject : Life Science, Nervous System

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Life Sciences

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There were no June exams, due to Covid

Grade 12 Life science past exam papers

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