Marine Ecology MCQs with Answers

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Welcome to the Marine Ecology MCQs with Answers. In this post, we have shared Marine Ecology Online Test for different competitive exams. Find practice Marine Ecology Practice Questions with answers in Biology Tests exams here. Each question offers a chance to enhance your knowledge regarding Marine Ecology.

Marine Ecology Online Quiz

By presenting 3 options to choose from, Marine Ecology Quiz which cover a wide range of topics and levels of difficulty, making them adaptable to various learning objectives and preferences. You will have to read all the given answers of Marine Ecology Questions and Answers and click over the correct answer.

Test Name: Marine Ecology MCQ Quiz Practice
Type: Quiz Test
Total Questions: 40
Total Marks: 40
Time: 40 minutes

Note: Answer of the questions will change randomly each time you start the test. Practice each quiz test at least 3 times if you want to secure High Marks. Once you are finished, click the View Results button. If any answer looks wrong to you in Quizzes. simply click on question and comment below that question. so that we can update the answer in the quiz section.

Marine Ecology

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1 / 40

Which factor is a major threat to coral reefs worldwide?

b. Eutrophication

a. Ocean acidification

c. Overfishing

2 / 40

What is the primary cause of coral bleaching?

b. Predation

c. Overfishing

a. Elevated sea temperatures

3 / 40

What is the name for the zone where freshwater meets saltwater in estuarine environments?

b. Halocline

c. Thermocline

a. Brackish water

4 / 40

Which organism plays a crucial role in nutrient recycling in marine ecosystems?

a. Decomposers

b. Apex predators

c. Filter feeders

5 / 40

What is the main threat to marine turtles during their nesting season?

c. Predation

b. Climate change

a. Pollution

6 / 40

What is the name for the phenomenon where nutrients are transported vertically in the water column?

a. Mixing

b. Stratification

c. Turbulence

7 / 40

Which factor is a primary determinant of the distribution of marine organisms?

c. Soil pH

a. Water temperature

b. Air pressure

8 / 40

What is the main source of energy for deep-sea hydrothermal vent ecosystems?

c. Wind energy

b. Solar radiation

a. Geothermal heat

9 / 40

What is an estuary?

a. Coastal wetland

c. Underwater volcano

b. Deep-sea trench

10 / 40

What is the process by which marine organisms convert sunlight into chemical energy?

a. Chemosynthesis

c. Bioluminescence

b. Photosynthesis

11 / 40

Which process describes the movement of nutrients through different trophic levels in a marine ecosystem?

a. Food web

b. Biomagnification

c. Nutrient cycling

12 / 40

Which marine mammal is known for its long migrations between breeding and feeding grounds?

b. Walrus

a. Blue whale

c. Manatee

13 / 40

What is the term for the deepest part of the ocean, beyond the continental shelf?

b. Hadal zone

a. Abyssal zone

c. Pelagic zone

14 / 40

What is the main impact of ocean acidification on marine organisms?

c. Increased reproduction

a. Decreased shell formation

b. Enhanced growth

15 / 40

What is the term for the region of the ocean beyond the continental shelf?

c. Benthic zone

a. Pelagic zone

b. Abyssal zone

16 / 40

Which organism is responsible for converting nitrate into nitrogen gas in marine ecosystems?

b. Phytoplankton

a. Denitrifying bacteria

c. Zooplankton

17 / 40

Which marine organism is responsible for converting atmospheric nitrogen into ammonia?

b. Phytoplankton

c. Zooplankton

a. Nitrogen-fixing bacteria

18 / 40

What is the primary function of the lateral line system in fish?

c. Maintaining buoyancy

b. Gas exchange

a. Detecting vibrations

19 / 40

Which organism builds calcium carbonate skeletons that form coral reefs?

b. Sea anemones

c. Jellyfish

a. Corals

20 / 40

What is the term for the zone where freshwater meets saltwater in estuarine environments?

a. Brackish water

c. Thermocline

b. Halocline

21 / 40

Which marine organism has a mutualistic relationship with coral polyps?

a. Zooxanthellae

b. Sea anemones

c. Sea stars

22 / 40

Which marine habitat is characterized by high biodiversity and supports many juvenile fish?

a. Coral reefs

b. Mangrove forests

c. Kelp forests

23 / 40

What is the role of mangrove forests in coastal ecosystems?

c. Providing deep-sea habitats

b. Filtering pollutants

a. Protecting shorelines

24 / 40

Which marine organism is known for its ability to produce bioluminescence?

b. Sea cucumbers

c. Starfish

a. Jellyfish

25 / 40

What is the primary cause of marine dead zones?

a. Nutrient pollution

c. Underwater volcanism

b. Ocean acidification

26 / 40

Which marine ecosystem is characterized by high biodiversity and protects coastlines from erosion?

b. Polar ice caps

c. Open ocean

a. Mangrove forests

27 / 40

Which term describes a marine organism's movement with ocean currents?

b. Migration

a. Drift

c. Adaptation

28 / 40

What is the main impact of ocean acidification on marine organisms?

a. Decreased shell formation

b. Enhanced growth

c. Increased reproduction

29 / 40

What is the term for a large area of sea partially enclosed by land?

c. Bay

b. Gulf

a. Sea

30 / 40

What is the name for the phenomenon where nutrients from deep waters rise to the surface, enhancing productivity?

a. Upwelling

c. El Niño

b. Downwelling

31 / 40

Which marine zone is characterized by complete darkness and near-freezing temperatures?

b. Hadal zone

a. Abyssal zone

c. Mesopelagic zone

32 / 40

What is the primary role of phytoplankton in marine ecosystems?

a. Oxygen production

c. Coral reef formation

b. Herbivore food source

33 / 40

Which factor is a primary reason for the decline in global fish stocks?

c. Pollution

b. Coral bleaching

a. Overfishing

34 / 40

Which marine organism is known as a keystone species due to its critical role in maintaining ecosystem structure?

c. Swordfish

b. Dolphin

a. Sea otter

35 / 40

What is the role of sea grasses in marine ecosystems?

a. Habitat for small fish

b. Filter feeders

c. Deep-sea scavengers

36 / 40

Which factor contributes to the formation of ocean gyres?

a. Earth's rotation

c. Seafloor topography

b. Lunar cycles

37 / 40

Which zone of the ocean receives the most sunlight and supports the highest primary productivity?

b. Bathyal zone

c. Epipelagic zone

a. Abyssal zone

38 / 40

Which organism forms the base of the food chain in deep-sea hydrothermal vent ecosystems?

a. Chemotrophic bacteria

b. Giant tube worms

c. Anglerfish

39 / 40

Which factor contributes to the formation of ocean gyres?

c. Seafloor topography

b. Lunar cycles

a. Earth's rotation

40 / 40

What is the term for the seasonal reversal of ocean currents and winds in the tropical Pacific Ocean?

b. La Niña

c. Monsoon

a. El Niño

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admin3 weeks ago

0 6 1 minute read