Aquatic Biology MCQs with Answers

adminJune 13, 2024Last Updated: October 13, 2024

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

It is, therefore, the study of organisms and their ecosystems in water ranging from fresh systems to marine systems. Aquatic biology thus has a pivotal role in understanding the complex interactions within aquatic habitats besides the impact of human activities in these ecosystems.

Marine biology, a subset of aquatic biology, is specialized toward studying life in the marine environments in detail, from microscopic plankton to the giant whales. Marine biologists study the behavior, physiology, and ecology of marine organisms in order to contribute knowledge about ocean health and biodiversity.

Aquaculture biologists generally talk about the culture of aquatic animals for food, restoration, and preservation. Their main concern is to develop sustainable fishing farming methods with fish, shellfish, as well as other marine species by addressing concerns like disease management, breeding, and effects on the environment.

Aquatic biology and fisheries have a pivotal place in fish population management and conservation and all that facilitates proper aquatic resource use. This field contains the overall aspects of biology, ecology, and resource management in ensuring the sustainable use of aquatic resources. The fishes’ population dynamics, habitat requirements, as well as the effects of fishing practices, are studied by fisheries biologists in formulating regulations and conservation strategies.

Aquatic Biology Online Quiz

By presenting 3 options to choose from, Aquatic Biology 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 Aquatic Biology Questions and Answers and click over the correct answer.

Test Name: Aquatic Biology 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.

Aquatic Biology

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1 / 40

What is the term for the microscopic animals that live in freshwater and marine environments, feeding on plankton?

Benthos

Phytoplankton

Zooplankton

2 / 40

Which type of algae are known as microscopic floating plants found in aquatic ecosystems?

Phytoplankton

Zooplankton

Seagrasses

3 / 40

What is the name of the specialized respiratory organ in fish that extracts oxygen from water?

Spiracles

Gills

Lungs

4 / 40

Which organism is known as the "sea walnut" and belongs to the group of comb jellies?

Ctenophore

Mnemiopsis

Aurelia

5 / 40

What is the name of the aquatic ecosystems with high levels of salt concentration?

Brackish ecosystems

Hypersaline ecosystems

Saline ecosystems

6 / 40

What is the term for organisms that live at the bottom of oceans, lakes, or rivers?

Benthos

Nekton

Plankton

7 / 40

What is the term for the vertical movement of water driven by differences in temperature and salinity?

Thermohaline circulation

Downwelling

Upwelling

8 / 40

Which term describes the process by which aquatic organisms remove particles from the water column?

Osmoregulation

Filtration

Respiration

9 / 40

Which term describes the gradual transition from one type of aquatic ecosystem to another?

Habitat

Biome

Ecotone

10 / 40

Which term describes the ability of aquatic organisms to maintain internal salt concentrations different from their environment?

Ion regulation

Osmoregulation

Excretion

11 / 40

What is the name of the bacteria that live symbiotically in the roots of leguminous plants and fix nitrogen?

Mycorrhizae

Rhizobia

Cyanobacteria

12 / 40

What is the name of the relationship between a fungus and a photosynthetic partner in aquatic environments?

Coral

Mycorrhiza

Lichen

13 / 40

Which process involves the conversion of nitrogen gas into ammonia by aquatic bacteria?

Denitrification

Nitrification

Nitrogen fixation

14 / 40

What is the term for the protective external skeleton of arthropods found in aquatic environments?

Endoskeleton

Exoskeleton

Shell

15 / 40

Which type of marine organism is known for its ability to produce bioluminescent light?

Dinoflagellates

Jellyfish

Anglerfish

16 / 40

What is the name of the symbiotic relationship between algae and coral polyps in coral reefs?

Mycorrhizae

Phytoplankton

Zooxanthellae

17 / 40

What is the term for the process by which aquatic organisms take in dissolved oxygen from water?

Photosynthesis

Diffusion

Respiration

18 / 40

What is the name of the aquatic ecosystem characterized by high biodiversity and productivity due to nutrient-rich runoff?

Wetland

Mangrove

Estuary

19 / 40

Which term describes the process by which excess nutrients in aquatic ecosystems lead to oxygen depletion?

Hypoxia

Eutrophication

Oligotrophication

20 / 40

What is the name of the symbiotic relationship between algae and fungi in aquatic environments?

Lichen

Coral

Mycorrhiza

21 / 40

What is the name of the process by which aquatic organisms release excess salts from their bodies?

Ion regulation

Excretion

Osmoregulation

22 / 40

Which term describes the movement of marine organisms up and down in the water column?

Horizontal migration

Diurnal migration

Vertical migration

23 / 40

Which type of fish can live in both freshwater and saltwater environments?

Anadromous

Euryhaline

Stenohaline

24 / 40

Which term describes the process by which dissolved substances move across a semipermeable membrane?

Diffusion

Osmosis

Active transport

25 / 40

What is the term for the process by which aquatic plants and algae produce oxygen during photosynthesis?

Oxygen fixation

Oxygenation

Oxygen evolution

26 / 40

What is the name of the physical structure that separates the marine environment into different zones based on depth?

Pycnocline

Thermocline

Halocline

27 / 40

Which type of fish migrates from freshwater rivers to the ocean to reproduce?

Euryhaline

Anadromous

Catadromous

28 / 40

What is the term for the movement of water up from the roots of plants in aquatic environments?

Osmosis

Capillary action

Transpiration

29 / 40

Which group of organisms are microscopic animals that drift or swim near the surface of aquatic environments?

Zooplankton

Benthos

Phytoplankton

30 / 40

Which term describes the process by which aquatic organisms release waste products into their environment?

Osmoregulation

Excretion

Ion regulation

31 / 40

What is the name of the ecological region where freshwater rivers meet saltwater oceans?

Estuary

Marsh

Reef

32 / 40

Which aquatic organisms have a backbone and can regulate their body temperature internally?

Invertebrates

Fish

Reptiles

33 / 40

What is the term for the process by which dissolved nutrients like nitrogen and phosphorus accumulate in bodies of water?

Nutrient loading

Nutrient cycling

Nutrient enrichment

34 / 40

What is the name of the process by which aquatic organisms convert ammonium into nitrites and then into nitrates?

Nitrification

Nitrogen fixation

Denitrification

35 / 40

What is the name of the biogeochemical cycle that describes the movement of water on Earth?

Hydrological cycle

Nitrogen cycle

Carbon cycle

36 / 40

Which term describes the process by which aquatic organisms move towards or away from light?

Gravitaxis

Phototaxis

Chemotaxis

37 / 40

Which term describes the adaptation of marine organisms to survive in environments with low oxygen levels?

Hypoxia tolerance

Anaerobic respiration

Anoxia adaptation

38 / 40

Which type of aquatic organism is known for its ability to filter and clean water in aquatic ecosystems?

Mussels

Seaweed

Jellyfish

39 / 40

Which group of organisms play a crucial role in the carbon cycle by fixing carbon dioxide into organic compounds?

Zooplankton

Phytoplankton

Benthic organisms

40 / 40

What is the term for the upper layer of water in an aquatic ecosystem where sunlight penetrates?

Photic zone

Benthic zone

Aphotic zone

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adminJune 13, 2024Last Updated: October 13, 2024

0 5 2 minutes read