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

What is the primary role of phytoplankton in marine ecosystems?

a. Oxygen production

c. Coral reef formation

b. Herbivore food source

2 / 40

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

a. El Niño

b. La Niña

c. Monsoon

3 / 40

What is the role of mangrove forests in coastal ecosystems?

c. Providing deep-sea habitats

b. Filtering pollutants

a. Protecting shorelines

4 / 40

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

c. Wind energy

a. Geothermal heat

b. Solar radiation

5 / 40

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

a. Decomposers

c. Filter feeders

b. Apex predators

6 / 40

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

c. Anglerfish

a. Chemotrophic bacteria

b. Giant tube worms

7 / 40

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

c. Mesopelagic zone

b. Hadal zone

a. Abyssal zone

8 / 40

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

b. Mangrove forests

a. Coral reefs

c. Kelp forests

9 / 40

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

c. Thermocline

b. Halocline

a. Brackish water

10 / 40

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

b. Gas exchange

c. Maintaining buoyancy

a. Detecting vibrations

11 / 40

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

a. Overfishing

c. Pollution

b. Coral bleaching

12 / 40

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

c. Pelagic zone

a. Abyssal zone

b. Hadal zone

13 / 40

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

c. El Niño

a. Upwelling

b. Downwelling

14 / 40

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

b. Sea cucumbers

a. Jellyfish

c. Starfish

15 / 40

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

a. Decreased shell formation

c. Increased reproduction

b. Enhanced growth

16 / 40

Which factor is a major threat to coral reefs worldwide?

b. Eutrophication

c. Overfishing

a. Ocean acidification

17 / 40

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

b. Stratification

c. Turbulence

a. Mixing

18 / 40

What is the role of sea grasses in marine ecosystems?

c. Deep-sea scavengers

b. Filter feeders

a. Habitat for small fish

19 / 40

What is an estuary?

b. Deep-sea trench

a. Coastal wetland

c. Underwater volcano

20 / 40

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

c. Thermocline

a. Brackish water

b. Halocline

21 / 40

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

b. Walrus

c. Manatee

a. Blue whale

22 / 40

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

b. Abyssal zone

c. Benthic zone

a. Pelagic zone

23 / 40

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

c. Open ocean

b. Polar ice caps

a. Mangrove forests

24 / 40

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

c. Predation

b. Climate change

a. Pollution

25 / 40

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

c. Epipelagic zone

b. Bathyal zone

a. Abyssal zone

26 / 40

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

b. Gulf

c. Bay

a. Sea

27 / 40

Which organism builds calcium carbonate skeletons that form coral reefs?

b. Sea anemones

a. Corals

c. Jellyfish

28 / 40

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

b. Air pressure

a. Water temperature

c. Soil pH

29 / 40

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

c. Increased reproduction

a. Decreased shell formation

b. Enhanced growth

30 / 40

Which marine organism has a mutualistic relationship with coral polyps?

b. Sea anemones

a. Zooxanthellae

c. Sea stars

31 / 40

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

b. Phytoplankton

a. Nitrogen-fixing bacteria

c. Zooplankton

32 / 40

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

c. Adaptation

a. Drift

b. Migration

33 / 40

What is the primary cause of marine dead zones?

c. Underwater volcanism

b. Ocean acidification

a. Nutrient pollution

34 / 40

Which factor contributes to the formation of ocean gyres?

b. Lunar cycles

c. Seafloor topography

a. Earth's rotation

35 / 40

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

b. Dolphin

a. Sea otter

c. Swordfish

36 / 40

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

c. Zooplankton

a. Denitrifying bacteria

b. Phytoplankton

37 / 40

What is the primary cause of coral bleaching?

c. Overfishing

b. Predation

a. Elevated sea temperatures

38 / 40

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

c. Bioluminescence

a. Chemosynthesis

b. Photosynthesis

39 / 40

Which factor contributes to the formation of ocean gyres?

b. Lunar cycles

a. Earth's rotation

c. Seafloor topography

40 / 40

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

b. Biomagnification

a. Food web

c. Nutrient cycling

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admin3 weeks ago

0 6 1 minute read