PG TRB ZOOLOGY | Unit I - ANIMAL DIVERSITY AND PHYLOGENY | Types of Corals and Coral reefs.

PG TRB ZOOLOGY ONLINE TEST / QUIZ AS PER LATEST SYLLABUS | Unit I - ANIMAL DIVERSITY AND PHYLOGENY | Types of Corals and Coral reefs.

1. Which of the following is a primary characteristic of hermatypic corals?

a) They lack symbiotic algae
b) They build reefs in deep water
c) They contain zooxanthellae for photosynthesis
d) They are non-reef building

2. What is the main structural component of coral reefs?

a) Silica
b) Calcium carbonate
c) Chitin
d) Keratin

3. Fringing reefs are typically found in which location?

a) Far from shore in open ocean
b) Directly attached to the shoreline
c) Surrounding a lagoon
d) In deep abyssal zones

4. Which type of coral is known as 'brain coral' due to its appearance?

a) Staghorn coral
b) Meandrina
c) Fire coral
d) Sea fan

5. Barrier reefs are separated from the mainland by what feature?

a) A deep lagoon
b) A shallow reef flat
c) Volcanic islands
d) Mangrove forests

6. Ahermatypic corals primarily differ from hermatypic corals by?

a) Building large reefs
b) Lacking zooxanthellae
c) Requiring sunlight
d) Being colonial

7. Which is an example of a soft coral?

a) Acropora
b) Gorgonian
c) Porites
d) Montipora

8. Atolls are formed from which type of reef structure?

a) Fringing reefs
b) Barrier reefs around subsided volcanoes
c) Patch reefs
d) Table reefs

9. The Great Barrier Reef is an example of which reef type?

a) Fringing reef
b) Barrier reef
c) Atoll
d) Patch reef

10. What is the role of zooxanthellae in coral reefs?

a) Predation
b) Photosynthesis and nutrient provision
c) Structural support
d) Reproduction

11. Which coral type is branching and fast-growing?

a) Massive coral
b) Staghorn coral
c) Plate coral
d) Finger coral

12. Coral bleaching occurs due to the loss of?

a) Calcium carbonate
b) Zooxanthellae
c) Polyps
d) Sclerites

13. Patch reefs are small and isolated reefs found in?

a) Lagoons
b) Deep ocean
c) River mouths
d) Polar regions

14. Which phylum do corals belong to?

a) Porifera
b) Cnidaria
c) Mollusca
d) Echinodermata

15. Fire corals are actually?

a) True corals
b) Hydrozoans
c) Algae
d) Sponges

16. The primary threat to coral reefs is?

a) Overfishing
b) Climate change and ocean acidification
c) Invasive species
d) Natural erosion

17. Which zone of a coral reef has the highest biodiversity?

a) Reef flat
b) Reef crest
c) Fore reef
d) Back reef

18. Black band disease affects corals by?

a) Causing bleaching
b) Bacterial infection leading to tissue loss
c) Overgrowth of algae
d) Physical damage

19. Coral polyps reproduce asexually through?

a) Budding
b) Spawning
c) Fragmentation
d) Both a and c

20. Which is not a type of coral reef?

a) Fringing
b) Barrier
c) Atoll
d) Volcanic

21. Staghorn corals belong to the genus?

a) Acropora
b) Fungia
c) Tubipora
d) Heliopora

22. The skeleton of hard corals is made of?

a) Aragonite
b) Calcite
c) Both a and b
d) Silica

23. Which coral is known as organ pipe coral?

a) Tubipora musica
b) Millepora
c) Dendrophyllia
d) Alcyonium

24. Coral reefs are mostly found in?

a) Tropical waters
b) Temperate waters
c) Polar waters
d) Freshwater

25. What is the function of nematocysts in corals?

a) Photosynthesis
b) Capturing prey and defense
c) Reproduction
d) Locomotion

26. Which is a solitary coral?

a) Fungia
b) Acropora
c) Porites
d) Montastraea

27. The theory of coral atoll formation was proposed by?

a) Charles Darwin
b) Alfred Wegener
c) James Hutton
d) Louis Agassiz

28. Blue coral is scientifically known as?

a) Heliopora coerulea
b) Tubipora musica
c) Millepora alcicornis
d) Gorgonia ventalina

29. Coral reefs provide habitat for approximately what percentage of marine species?

a) 5%
b) 25%
c) 50%
d) 75%

30. Which factor does not contribute to coral reef formation?

a) Warm water temperatures
b) High salinity
c) Low light penetration
d) Clear water

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