Physiological Status - Marine Science - Exam, Exams for Marine Science and Biology. Indira Gandhi Institute of Medical Sciences

Physiological Status - Marine Science - Exam, Exams for Marine Science and Biology. Indira Gandhi Institute of Medical Sciences

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Physiological Status , Nutrient Exchange, Salt Marsh Ecosystem, Estuarine Environment, Physiological Mechanisms, Saline Habitat, Seaweed Morphology, Mass Spawning. Mostly people dont even know what is marine science. I r...
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Microsoft Word - mr420_adv1_dec2010

Semester I Examinations 2010 / 2011

Exam Code(s) 4MR2

Exam(s) 4th B.Sc. Marine Science (Hons)

Module Code(s) MR420/MR401/BT422

Module(s) Advanced Topics Paper 1

External Examiner(s) Prof. Richard Thompson

Internal Examiner(s) Dr Martin White and other internal examiners

Instructions: Answer FOUR questions, ONE from each section.

(allow approximately 45 minutes per question)

All questions are equally weighted. Use a separate answer book for each section.

Duration 3 hours

No. of Pages 2

Department(s) Botany, Zoology

Requirements None

Section A

1. With reference to nutrient exchange, describe the salt marsh ecosystem, and its

contribution to, the estuarine environment

2. Describe the principal environmental factors that affect plant communities in a mangrove

ecosystem. Refer to the distribution of key species in relation to these factors.

3. Give an account of the physical and physiological mechanisms that enable salt marsh and

mangrove species to survive in a saline habitat

Section B

4. Discuss the implications of seaweed morphology for photosynthesis, growth and survival:

how relevant is the form-function model by Littler?

5. How useful are marine algae as (direct or indirect) indicator species of water pollution?

Describe the characteristics required for a good indicator species.

6. Write an short essay to describe nutrient uptake by seaweeds. What is meant by the

physiological status of a seaweed/alga and what does it tell us?

Section C

7. Mass spawning is a reproductive strategy adopted by many but not all corals. Discuss the

advantages and disadvantages of this strategy and relate them to the evolution of acroporid


8. Zooxanthellae, symbionts of hermatypic corals, fix carbon dioxide during photosynthesis

but coral reefs are thought, nevertheless, to be sources of atmospheric carbon. Explain.

9. Shells and hard skeletons appeared about 600 million years ago. Discuss what the likely

factors were that prohibited their development before that time, but has allowed them


Section D

10. Compare and contrast the impacts of global warming in marine and terrestrial habitats.

Give detailed examples of evidence for the impacts of global warming in marine habitats.

11. What advantages and disadvantages do biological tags have over artificial tags in fish

stock separation?

12. What is the current status of cod stocks in the Irish Sea? Explain the annual status of this

resource over recent years according to the parameters in a sustainable yield model.

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