Marine Sciences Paper 2 (English)

November 2022 — Grade 12 / Matric — Marine Sciences

Past Paper 2022 Grade 12 English

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Q1— Section header —

1.1Various options are provided as possible answers to the following questions. Choose the answer and write only the letter ( D\ next to the question number

1.1.11D.

1.1.1The structure represented below is referred to as a/an Source https://www.deepseanews.com

1.1.2harks are mostly carnivores. opportunistic omnivores. all apex predators.

1.1Amphibians first appeared about years ago.

1.1Brittle stars Marine Science s/P2 DBE/November 2022 NSC Copyright reserved

1.1Which statement about the denticles found in Chondrichthyes is INCORRECT

1.1.6Select the CORRECT statement/s about sharks (i\ (ii\ (iii\ (iv\

1.1.7Which ONE of the options below gives the CORRECT common name and scientific name of the organism below? [Source

1.1.8Which statement about sea snakes is INCORRECT They have f lattened bodies and tails

1.1.9The diagrams below represent individuals in three different classes of the same phylum. Source https://studyres.com/doc/7997474/phylum

1.1.10Which ONE of the options below provides the correct name and function of the structure labelled in the image below. [Source: https://www.natureplprints.com

1.2Give the correct scientific term/ phrase for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2. 10 \in the

1.2.10The small jointed legs with which eather stars hold onto substrate A hard, flexible protein found in skin, horns, claws and m

1.3Indicate whether each of the des ription in COLUMN I applies to A ONLY

1.3.1Sea cucumbers A: belong to deuterostomes B: belong to the class Holothuroidea

1.3.2Elasmobranchii A: have a prism valve digestive system B: are able to constantly replace their teeth

1.3.3Loggerhead T urtles A: nest on KwaZulu Natal beaches B: have a disproportionately large body in comparison to their head

1.3.4Lampreys A: are eel like parasites and feed on blood of organisms they attach to B:

1.3.5Reptiles' circulatory system A: B: includes a four chambered heart referred to as an open system (5 x 2\ (10\

Q2— Section header —

2.1SEABIRD BYCATCH Many species of seabirds are facing the risk of extinction. Large numbers of birds have been caught as bycatch by long line fisheries. Long line fisheries also influence the food availability of seabirds.

2.1.1State the aim of this investigation

2.1.2Identify TWO control led variables mentioned in the text for the investigation. (2\

2.1Construct a pie chart to illustrate the proportions of birds caught by each fishing vessel. Use the total number of birds caught per vessel. Show ALL calculations.

2.1.4Why would data such as that found in the table above, be considered as important for ecologists? (2\

2.1.5hy can fisheries lead to the extinction of bird species

2.1.6nternational regulations indicate seabird bycatch may not be more than 50 seabirds in total. a\ b\

2.2SARDINE FISH The annual sardine run , containing millions of individual sardines, occurs every year between May and August when a coastal current of cold

2.2.1Describe the mechanism s used by Southern Right Whales to retain body temperature during their migration. (2\

2.2.2Sardines are able to regulate their body temperature a\ b\ Draw a diagram to indicate how sardines

2.2ame and describe each of the two groups of Cetaceans (4\ (12\

2.3Some marine mammals and marine fish species migrate over long distances to reproduce , e ach having their own reproductive strategy. Use a table to compare the reproductive strategies

3.1TRACKING THE ORIGIN OF SHARK Sharks do not preserve very well. Usually only their dermal denticles and teeth readily fossilise. Because of this , their origins are fragmentary. However, researchers have a good id

3.1.1Explain why shark fossils that have been discovered are limited to denticles and teeth. (2\

3.1.2Turtles and snakes are examples of organisms that returned to the ocean as part of their evolutionary history. (a\ (b\ State possible reasons why these organisms

3.1.3The above extract indicates an evolutionary development from amphibians to reptiles. Differentiate between the reproductive process es in amphibians and reptiles

3.2Consider the structure below and answer the questions that follow. [Source: https://a animals.com/blog/

3.2.1What does the structure above represent? (1\

3.2.2Explain h ow this structure is adapted to maximi survival of the species

3.2.3Name the reproductive strategy represented in the diagram above. (1\

3.2.4Discuss the advantages that other reproductive strategies in sharks

Q3— Section header —

3.3Consider the organisms below and answer the questions that follow. [Source: https://www.science.org/content/article/ [Source: https://www.earth.com/news/

3.3.1 or rganism provide the:

3.3.2 Select an organism above that, in your opinion, is better adapted for survival in a marine environment and substantiate your answer. (4\

3.3.3 Draw and label the internal structure of rganism (6\ 12

Q4— Section header —

Q5— Section header —

Topics Identified

GeneticsEvolutionHuman PhysiologyRespiration

Mark Allocation

Total150 marks

Key Information

Websitewww.deepseanews.com · www.natureplprints.com

Paper information

SubjectMarine Sciences

Year2022

SessionNovember

TypePast Paper

PaperPaper 2

LanguageEnglish

Pages13

Downloads5

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start daySaturday

Exam periodNovember 2022

Days since exam1,450

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