NSC Marine Sciences Marine Ecosystems and Ecology: Various options are provided as

Question

Various 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 1.1.10) in the ANSWER BOOK, e.g. 1.1.11 D.

1.1.1 A form of agriculture that combines raising fish together with plant cultures that have no soil:
 A. Hydroponics
 B. Aquaponics
 C. Hydroculture
 D. Aquaculture

1.1.2 The tonnage that can be caught in the following season without compromising the future sustainable health of fish stock is referred to as ...
 A. Maximum Allowable Catch.
 B. Catch Per Unit Effort.
 C. Total Allowable Catch.
 D. Maximum Species Yield.

1.1.3 Which ONE of the following contributes the most to the carbon dioxide concentration in the atmosphere?
 A. Rising global temperatures
 B. CFCs
 C. Activities producing CFCs
 D. Agricultural activities

1.1.4 Which ONE of the following is the CORRECT Köppen-Geiger classification for the north-west coast of South Africa?
 A. BWk
 B. BSh
 C. BsD
 D. BWh

1.1.5 Destructive waves occur when ...
 A. there is a stronger swash than backwash.
 B. deposition is greater than erosion.
 C. erosion is greater than deposition.
 D. there is a stronger backwash than swash.

1.1.6 Which of the following is CORRECT for the commercial use of algae?
 A. Red algae Alginic acid Yellow food colourant
 B. Red algae Agar Gelling agent for ice cream
 C. Green algae Beta-carotene Yellow food colourant for ice cream
 D. Brown algae Alginic acid Yellow food colourant

1.1.7 The statements below refer to the climate along the south-west coast of South Africa.
 (i) Mediterranean climate
 (ii) Prevailing winds are NW in winter and SE in summer
 (iii) Dry season occurs during winter
 (iv) Strongest winds occur on mid-summer afternoons
 (v) Rainfall occurs mostly in the form of summer thundershowers
 Which of the following combinations is CORRECT for this type of climate?
 A. (i), (iii) and (iv)
 B. (ii), (iii) and (v)
 C. (i), (ii), (iv) and (v)
 D. (ii), (iii) and (iv)

1.1.8 Which gas is NOT one of the greenhouse gases found in the Earth’s atmosphere?
 A. Methane
 B. H2O
 C. Nitrogen
 D. CO2

1.1.9 Which statement is INCORRECT and NOT associated with ocean acidification?
 A. Decrease in the pH of the sea water
 B. Increased absorption of carbon dioxide in the ocean
 C. Increased proportion of hydrogen ions
 D. Increased proportion of carbonic acid

1.1.10 The image below shows a multi-layered cage holding system used in aquaculture.

The statements below refer to the holding system above.
 (i) Cannot easily be moved from one location to another
 (ii) Layer B contains bivalve species or filter feeders
 (iii) Consists of sea cages and sea pens
 (iv) Layer A contains animals that absorb and clean the waste products
 (v) Used as a partial mitigation measure to prevent eutrophication
 Which of the following combinations is CORRECT for this type of holding system?
 A. (ii) and (iv)
 B. (i), (ii), and (v)
 C. (i), (ii) and (iv)
 D. (i), (ii), (iii), and (v)

(10 x 2)

1.2 Give the correct scientific term/phrase for each of the following descriptions. Write only the term/phrase next to the question numbers (1.2.1 to 1.2.10) in the ANSWER BOOK.

1.2.1 Substances which promote the growth of micro-organisms
1.2.2 The proportion of incident light that is reflected by a surface
1.2.3 A geological interval of warmer global average temperatures lasting thousands of years
1.2.4 Organisms that use calcium carbonate and calcium ions in dissolved ocean water to construct shells and skeletons
1.2.5 A fragment of foreign rock trapped within a host rock and having a different composition from the host rock
1.2.6 A model of currents or winds near a horizontal boundary in which the flow direction rotates as one moves away from the boundary
1.2.7 A narrow piece of land consisting of stranded material that protrudes into the sea
1.2.8 A coastal landform on a resistant rock cliff face that protrudes out into the sea
1.2.9 The swirling of ocean waters and the reverse currents created when the water is in a turbulent flow regime

(10 x 1)

1.3 Indicate whether each of the descriptions in COLUMN A applies to ONLY, B ONLY, BOTH A AND B or NONE of the items in COLUMN B. Write only A ONLY, B ONLY, BOTH A AND B or NONE next to the question numbers (1.3.1 to 1.3.5) in the ANSWER BOOK.

COLUMN A
1.3.1 Blombos Cave 
  A: artefacts dated to 77 000 years ago / engraved ochre
1.3.2 Weather
  A: 24 hours
 B: atmosphere's atmospheric conditions over 24 hrs
1.3.3 Increased proportion of carbon dioxide
  A: stimulates calcium carbonate
1.3.4 Kynsa Heads
  A: East Coast
  B: South Coast
1.3.5 Embryo dunes
  A: grey soil colour / brown soil colour

(5 x 2)

Various options are provided as possible answers to the following questions - NSC Marine Sciences - Question 1 - 2023 - Paper 1

Worked Solution & Example Answer:Various options are provided as possible answers to the following questions - NSC Marine Sciences - Question 1 - 2023 - Paper 1

A form of agriculture that combines raising fish together with plant cultures that have no soil:

The tonnage that can be caught in the following season without compromising the future sustainable health of fish stock is referred to as ...

Which ONE of the following contributes the most to the carbon dioxide concentration in the atmosphere?

Which ONE of the following is the CORRECT Köppen-Geiger classification for the north-west coast of South Africa?

Destructive waves occur when ...

Which of the following is CORRECT for the commercial use of algae?

Which of the following combinations is CORRECT for this type of climate?

Which gas is NOT one of the greenhouse gases found in the Earth’s atmosphere?

Which statement is INCORRECT and NOT associated with ocean acidification?

Which of the following combinations is CORRECT for this type of holding system?

Substances which promote the growth of micro-organisms

The proportion of incident light that is reflected by a surface

A geological interval of warmer global average temperatures lasting thousands of years

Organisms that use calcium carbonate and calcium ions in dissolved ocean water to construct shells and skeletons

A fragment of foreign rock trapped within a host rock and having a different composition from the host rock

A model of currents or winds near a horizontal boundary in which the flow direction rotates as one moves away from the boundary

A narrow piece of land consisting of stranded material that protrudes into the sea

A coastal landform on a resistant rock cliff face that protrudes out into the sea

The swirling of ocean waters and the reverse currents created when the water is in a turbulent flow regime

Indicate whether each of the descriptions in COLUMN A applies to ONLY, B ONLY, BOTH A AND B or NONE of the items in COLUMN B.

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