1.1.1 The image below shows an animal classified as an echinoderm - NSC Marine Sciences - Question 1 - 2024 - Paper 2
Question 1
1.1.1 The image below shows an animal classified as an echinoderm.
Which class does this echinoderm belong to?
A. Ophiroidea
B. Asteroidea
C. Holothuroidea
D. Crin... show full transcript
Worked Solution & Example Answer:1.1.1 The image below shows an animal classified as an echinoderm - NSC Marine Sciences - Question 1 - 2024 - Paper 2
Step 1
Which class does this echinoderm belong to?
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Answer
The echinoderm shown in the image belongs to the class C. Holothuroidea, commonly known as sea cucumbers. This classification is based on their unique body structure and habitat.
Step 2
The upper eulitoral zone, where small wrinkles are dominant, is called the...
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Answer
This zone is referred to as the A. littoral zone, which is characterized by its proximity to the shoreline and the presence of organisms adapted to fluctuating environmental conditions.
Step 3
The outer protective covering made of cellulose in ascidians is called an...
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This outer protective covering is known as the B. tunic, which serves as a defense mechanism for ascidians.
Step 4
Which abiotic factor is the cause of the behavioural adaptation illustrated in the image?
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Answer
The correct answer is D. Wave action. Wave action influences the distribution and behavior of marine organisms, including sea urchins, shown in the image.
Step 5
Which statement regarding the crustacean is CORRECT?
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Answer
The correct statement about the crustacean is D. filters out microscopic organic material that is deposited by rising waves. This behavior illustrates its role in the marine ecosystem.
Step 6
What is the main effect that the absence of the structure circled in the image above will have on this animal?
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Answer
The absence of the mentioned structure will reduce B. the ability to feed. This is crucial for the survival of the animal as feeding is essential for obtaining nutrients.
Step 7
Which combination contains only INCORRECT statements for BOTH sea urchins and sea cucumbers?
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Answer
The correct combination of INCORRECT statements is C. (i), (ii), (iv) and (v), as these characteristics do not apply to both groups.
Step 8
Which statement is INCORRECT about oceanic circulation in marine.
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Answer
For this part, the incorrect statement should relate to the common misconceptions surrounding oceanic circulatory systems and their impacts on marine life. Specific details would depend on the context provided.
Step 9
Which combination is INCORRECT for the key benefits of MPAs?
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Answer
The INCORRECT combination regarding MPAs is B. (ii) only, highlighting the misconception that MPAs do not impact commercial development positively.
Step 10
1.2.1 The combination of regions on Earth occupied by living organisms:
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Answer
The correct term for this is Biosphere.
Step 11
1.2.2 The first body opening that forms in the early stages of development:
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Answer
This is known as the Blastopore.
Step 12
1.2.3 Giving false or misleading information in terms of the environmental benefits of a product or service:
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Answer
This practice is referred to as Greenwashing.
Step 13
1.2.4 The population size of an individual species of any form of sea life regarded as food by humans:
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Answer
This is known as the (Seafood) stock.
Step 14
1.2.5 Dense structures of digestive glands extending from the stomach and intestines into the anus, assisting the digestion and absorption of food:
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Answer
These structures are referred to as Pyloric caeca.
Step 15
1.2.6 The microscopic heterotrophs in soil or sediment ecosystems that are often referred to as decomposers:
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Answer
These microscopic organisms are called Meiobenthos.
Step 16
1.2.7 An area, with some form of protection, around the perimeter of the edge of a protected area:
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This area is known as a Buffer zone / Transitional (protection) zone.
Step 17
1.2.8 A midshore estuarine zone, characterised by the presence of barnacles:
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Answer
This zone is referred to as the Balanoid zone.
Step 18
1.2.9 A sausage-like plate that allows sea water to enter the water vascular system of echinoderms:
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This structure is called the Madreporite.
Step 19
1.2.10 Group of animals having a notochord which is NOT divided into vertebral segments:
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This group is called Protochordates.
Step 20
1.3.1 Objectives of COMPARE
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Answer
This applies to Both A and B.
Step 21
1.3.2 Eutrophication
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Answer
This applies to B only.
Step 22
1.3.3 Oyster belt
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Answer
This applies to None.
Step 23
1.3.4 Sustainable ecotourism practices
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This applies to Both A and B.
Step 24
1.3.5 Scientific ascidian species
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