NSC Marine Sciences Life Processes in Marine Organisms: 1.1.1 Which statement about brit

Question

1.1.1 Which statement about brittle stars is CORRECT?

C. They have no anus.

1.1.2 A turtle species known to nest on northern KZN beaches in significant numbers:

D. Leatherback.

1.1.3 The lateral line organ in bony fish detects …

B. vibrations.

1.1.4 Which fins in Osteichthyes are generally paired?

D. Dorsal.

1.1.5 Consider the following characteristics and complete the statement below.

(i) Diplobastic
(ii) Tripoblastic
(iii) Water vascular system
(iv) Exoskeleton
(v) Tube feet

Characteristic features of Agnathan fish include …

B. (ii), (iv) and (v).

1.1.7 In 1910 the African penguin population size was estimated to be 1 500 000 penguins. Just over a century later, in 2012, there were only 23 700.

What percentage is the 2012 population size of the 1910 population size?

C. 1,015%.

1.1.8 Most elasmobranchs retain urea in their blood and body tissues. The reason for this is to …

D. keep their osmotic conditions similar to sea water.

1.1.9 Fish living in fresh water …

C. have no kidneys.

1.2 Give a suitable scientific word/term for each of the following descriptions.

1.2.1 Small bones in some animals or the flat bony plates forming the skeleton of echinoderms

Ossicles.

1.2.2 Animal phyla in which the blastopore becomes the anus

Deuterostomes.

1.2.3 A common opening for the digestive and reproductive tracts in vertebrates

Cloaca.

1.2.4 A form of camouflage, where the dorsal surface of a flying or swimming animal blends in with the surface below it, while the ventral surface blends in with the sky or ocean surface above it

Countershading.

1.2.5 An oxygen-storing substance similar to haemoglobin, found in the musculoes of some animals

Myoglobin.

1.2.6 The bony plates on the ventral surface of a turtle or tortoise

Plastron.

1.2.7 The ability of certain organisms to emit light from their bodies

Bioluminescence.

1.2.8 The small bones in the inner ear of a fish, which can be used to estimate their age

Otoliths.

1.3 Indicate 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.

1.3.1 A reproductive strategy in turtles
B only.

1.3.2 A mammalian reproductive strategy
Both A and B.

1.3.3 Double circulation
None.

1.3.4 Ectothermic
None.

1.3.5 Scales of dermal origin
A only.

1.4 Study the picture of an animal in the class Aves to answer the questions that follow.

1.4.1 For feather A, give:

(a) The name

(b) ONE function

1.4.2 Answer the following questions on feathers:

(a) Name ONE other type of feather found on birds.

(b) State ONE function of the feather in your answer to QUESTION 1.4.2(a).

1.1.1 Which statement about brittle stars is CORRECT? C - NSC Marine Sciences - Question 1 - 2021 - Paper 2

Worked Solution & Example Answer:1.1.1 Which statement about brittle stars is CORRECT? C - NSC Marine Sciences - Question 1 - 2021 - Paper 2

1.1.1 Which statement about brittle stars is CORRECT?

1.1.2 A turtle species known to nest on northern KZN beaches in significant numbers:

1.1.3 The lateral line organ in bony fish detects …

1.1.4 Which fins in Osteichthyes are generally paired?

1.1.5 Characteristic features of Agnathan fish include …

1.1.7 What percentage is the 2012 population size of the 1910 population size?

1.1.8 The reason for urea retention in elasmobranchs is to …

1.1.9 Fish living in fresh water …

1.2.1 Small bones in some animals or the flat bony plates forming the skeleton of echinoderms

1.2.2 Animal phyla in which the blastopore becomes the anus

1.2.3 A common opening for the digestive and reproductive tracts in vertebrates

1.2.4 A form of camouflage which blends in with the surface

1.2.5 An oxygen-storing substance in animals

1.2.6 The bony plates on the ventral surface of a turtle or tortoise

1.2.7 The ability of organisms to emit light

1.2.8 The small bones in the inner ear of a fish

1.3.1 A reproductive strategy in turtles

1.3.2 A mammalian reproductive strategy

1.3.3 Double circulation

1.3.4 Ectothermic

1.3.5 Scales of dermal origin

1.4.1 For feather A, give: (a) The name

1.4.1 For feather A, give: (b) ONE function

1.4.2 Answer the following questions on feathers: (a) Name ONE other type of feather found on birds.

1.4.2 Answer the following questions on feathers: (b) State ONE function of the feather in your answer to QUESTION 1.4.2(a).

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