Marine Sciences Paper 2 (English)

November 2021 — Grade 12 / Matric — Marine Sciences

Past Paper 2021 Grade 12 English

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🎯 150 marks 📄 6 pages 📝 54 items found 📚 5 topics 🔑 1 key info

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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 (A D\ next to the question numbers (1.1.1 to 1.1. \the ANSWER BOOK, e.g. 1.1.1 D.

1.1.1Which statement about brittle stars is CORRECT They evert their stomachs to digest their food

1.1.2A t urtle species known to nest on n orthern KZN beaches in significant numbers: Green

1.1.3The hemicals in the water

1.1.4 Which fins in Osteichthyes are generally paired? audal

1.1.5Consider the following characteristics and complete the statement below. (i\ (ii\ (iii\ (iv\ (v\

1.1.6Consider the following characteristics and complete the statement below. (i\ (ii\ (iii\ (iv\ (v\

1.1In 1910 the African penguin population size was estimated to be 500 000 penguins. Just over a century later, in 2012, there were only 23 00.

1.1Most elasmobranchs retain urea in their blood and body tissues. The reason for this is to ake them ta

1.1.9Fish living in fresh water absorb a lot of water and produce a lot of urine. need to drink a lot. are hypotonic to their surroundings. have no kidneys

1.2Give a suitable scientific word/ term for each of the following de scriptions. Write only the term next to the question numbers (1.2.1 to 1. 2.

1.2Small bones in some animals or the flat bony plates form ing the skeleton of echinoderms Animal phyla in which the blastopore becomes the anus A common opening for the digestive and rep roductive tracts in

1.3Indicate whether each of the descriptions in COLUMN I apply to A ONLY B ONLY BOTH A AND B or NONE of the items in COLUMN II. Write

1.3.1A reproductive strategy in turtles A: B: ltricial recocial

1.3.2A mammalian reproductive strategy A: B: viparous iviparous

1.3.3Double circulation B: Osteichthyes Chondrichthyes

1.3.4Baleen plates A: B: innipeds Odontocetes

1.3.5Scales of dermal origin A: B: Reptilia Osteichthyes x 2\

1.4.1For feather , give: (a\ (b\ The name ONE function (1\ (1\

1.4.2Answer the following questions on feathers: (a\ (b\ Name ONE other type of feather found on birds. State ONE function of the feather in your answer to

Q1— Section header —

Q2— Section header —

2.1Identify the organisms represented by pictures and below by

2.2The diagram below shows the front end of a h agfish. Study the diagram and answer the questions that follow.

2.2.1Which letter (A E\ indicates the nostril? (1\

2.2.2What is the a daptation and primary function of structures (2\

2.2.3Label , which indicates the six large pores (1\

2.2.4(a\ Name the smaller pores indicated by that continue all the way to the tail.

2.2.5indicates the mouth. Explain how the hagfish ingest food. (3\ (10\ Marine

2.3Read the extract about sea squirts below and answer the questions that follow One of our closer relatives does not look a lot like us. It is effectively a tough

2.3.1The author is quite correct in s aying that the t unicates are closely related to us

2.3.2Draw a simple outline of a local tunicate, the red bait, to illustrate why the author refers to it as a 'wet paper bag'. Label the siphons. A heading is NOT required. (2\ .3.3 A closer study of the s ea squirt shows

2.4Sea u rchins are stenohaline , meaning that they can only tolerate a limited change in the salinity of their environment. The Breede River in the Western Cape has its mouth at the head of San Sebastian Bay.

2.4.1Draw a chart for the July 2019 data, on the same set of axes, where bar graph represent the average s

2.4.4Write a brief su mmary of the results indicated o the chart. Discuss the aspects of ea urchin

Q3— Section header —

3.1.1What is the purpose of the barbel s mentioned in paragraph AND what evidence in the extract indicates that they would need them? (2

3.1.2Exp lain how catsharks are able to ' roll th emselves into a doughnut' (paragraph 2\ (2\

3.1.3Catsharks are nocturnal (paragraph 3\ Answer the following questions (a\ Which adaptation of their eyes enables them to hunt equally effectively in bright daylight if they sense edible food nearby? (2\

3.1The extracts below are from a series of blogs written by staff at the Two Oceans Aquarium, Cape Town, about yjama

3.1.4In paragraph it states that catsharks are oviparous. (a\ How are they different from bony fish, w hich are also

3.1.5Refer to paragraph 6. (a\ What is meant by an apex predator (1\ (b\ Why has the author used this example to emphasise the statement?

3.2Generally, fast swimming predatory fish, like t una, have a core of dark muscle around the vertebral column. This muscle is very efficient but needs to be kept warmer than the surroundings in order to function correctly. Viewing the

3.2.1Give a name or term for this system. (1\

3.2.2xplain how this system functions (3\ (4\

3.3Consider the diagrams of the shark teeth below and answer the questions that follow.

3.3.1What type o tooth do great w hite sharks have? (1\

3.3.2Shark teeth are adapted for functionality. Analyse the teeth in the diagrams above and describe the structure AND give a specific function for and

3.4Reproduction in sharks (elasmobranchs\ differ from species to species. View the diagram of an unhatched shark (removed from the egg\ below and answer the questions that follow.

3.4.1(a\ What is the function of the yolk sack attached to the shark? (1\ (b\ Name the type of reproduction where sharks lay eggs and live young emerge from them (1\

3.4.2The blood of sharks travels through the body via single circulation. What doe single circulation mean (3\ (5\ 3.

3.5.5Name THREE changes within the bodies of marine mammals during diving bradycardia. Turtles are able to stay submerged for significantly longer than mammals or birds of a similar size and mass. Explain why this

Q4— Section header —

Topics Identified

Cell BiologyGeneticsEvolutionEcologyHuman Physiology

Mark Allocation

Total150 marks

Sections40 + 40 = 80 marks

Key Information

Websitewww.aquarium.co.za

Paper information

SubjectMarine Sciences

Year2021

SessionNovember

TypePast Paper

PaperPaper 2

LanguageEnglish

Pages16

Downloads4

Examination context

Decade2020s

Years ago5y

SeasonSpring (SH)

Start dayFriday

Exam periodNovember 2021

Days since exam1,817

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