1.1 Various options are provided as possible answers to the following questions - NSC Marine Sciences - Question 1 - 2021 - Paper 1
Question 1
1.1 Various options are provided as possible answers to the following questions. Choose the answer and write the letter (A–D) next to the question numbers (1.1.1 to ... show full transcript
Worked Solution & Example Answer:1.1 Various options are provided as possible answers to the following questions - NSC Marine Sciences - Question 1 - 2021 - Paper 1
Step 1
1.1.1 The lower eulittoral zone on a rocky shore will be exposed at ...
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Answer
The correct answer is A: spring high tide. This is when the upper eulittoral zone is fully exposed.
Step 2
1.1.2 Pill bugs and sand lice are found in abundance in the upper zone of sandy beaches of the ...
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The correct answer is B: West and South Coasts of South Africa. This is where these organisms are typically found.
Step 3
1.1.3 The balance between the energy radiating to the Earth from the sun and the energy radiating from the Earth back into space:
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The correct answer is B: Energy balance. This term describes the equilibrium of energy flow.
Step 4
1.1.4 Harvesting energy from tides in South Africa is not viable as ...
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The correct answer is A: the tidal range is too small. This limits the energy that can be harvested.
Step 5
1.1.5 The continuous area of water that the wind blows across in a consistent direction:
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Answer
The correct answer is B: Fetch. This is an important factor in wave formation.
Step 6
1.1.6 A company develops a prototype wave generator. Which of the following does NOT form part of the research and development costs?
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The correct answer is D: Maintenance costs. This is usually considered a separate operational cost.
Step 7
1.1.7 Which ONE of the combinations below shows what happens if a balloon is held in a warm car?
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The correct answer is C: Increases | Decreases. The kinetic energy of the gas molecules increases while the volume of the balloon decreases due to increased pressure.
Step 8
1.1.8 Polysaccharide extracted from red marine algae and used in some brands of toothpaste:
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The correct answer is A: Carrageenan. This polysaccharide is commonly used in food products.
Step 9
1.1.9 According to the Köppen-Geiger climate system, a location that is temperate, has dry summers and is considered to be very hot, will be classified as...
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The correct answer is B: Csa. This classification describes the Mediterranean climate.
Step 10
1.1.10 Polysaccharide contained within a balloon containing 8 litres of air at the surface, to 30 m below the surface. What volume will the gas in the balloon occupy at 30 m below sea level?
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The correct answer is C: 4 litres. According to Boyle's law, the volume of a gas decreases with increasing pressure.
Step 11
1.2.1 A low shore eulittoral zone characterised by dome-shaped arginvelleil limpets.
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The scientific term is Argenvilleii zone.
Step 12
1.2.2 Organisms that use CaCO₃ and Ca ions in dissolved ocean water to construct shells and skeletons.
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The scientific term is Calcifiers.
Step 13
1.2.3 The water from a wave moving up a beach profile.
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The scientific term is Swash.
Step 14
1.2.4 The carbonate mineral CaCO₃ used in biological processes to build up parts of the body.
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Answer
The scientific term is Aragonite.
Step 15
1.2.5 The farming of marine organisms.
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The scientific term is Mariculture.
Step 16
1.2.6 The almost microscopic heterotrophs in soil or sediment ecosystems.
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Answer
The scientific term is Meiofauna.
Step 17
1.2.7 A mechanism through which mechanical energy is converted into electrical energy.
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The scientific term is Generator.
Step 18
1.3.1 Indicate whether each of the terms in COLUMN I apply to A ONLY, B ONLY, BOTH A AND B or NONE.
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The answer is B only for Pinnacle point, as it applies specifically to reed fish traps.
Step 19
1.3.2 Indicate whether each of the terms in COLUMN I apply to A ONLY, B ONLY, BOTH A AND B or NONE.
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The answer is Both A and B for Ecotonal zone, as it applies to both terms in COLUMN II.
Step 20
1.3.3 Indicate whether each of the terms in COLUMN I apply to A ONLY, B ONLY, BOTH A AND B or NONE.
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The answer is A only for Abiotic factor, which is relevant to available O₂.
Step 21
1.3.4 Indicate whether each of the terms in COLUMN I apply to A ONLY, B ONLY, BOTH A AND B or NONE.
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The answer is Both A and B for Ocean acidification as it relates to increased absorption of greenhouse gases and lower pH.
Step 22
1.4.1 Label distances A and B.
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Distance A is labeled as the crest of the wave, while distance B is the trough.
Step 23
1.4.2 Label point x on the wave.
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Point x is located at the equilibrium position of the wave.
Step 24
1.4.3 Give the LETTER and NAME of the property of the wave that would decrease when a wave moves from deeper water into a much shallower area.
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The property is A: wavelength. This decreases due to the wave slowing down in shallow water.
