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

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Aquatic Biology

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1 / 40

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

Lungs

Gills

Spiracles

2 / 40

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

Photosynthesis

Respiration

Diffusion

3 / 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

4 / 40

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

Halocline

Thermocline

Pycnocline

5 / 40

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

Capillary action

Osmosis

Transpiration

6 / 40

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

Filtration

Respiration

Osmoregulation

7 / 40

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

Ion regulation

Excretion

Osmoregulation

8 / 40

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

Nekton

Plankton

Benthos

9 / 40

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

Benthic zone

Aphotic zone

Photic zone

10 / 40

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

Carbon cycle

Nitrogen cycle

Hydrological cycle

11 / 40

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

Phytoplankton

Benthic organisms

Zooplankton

12 / 40

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

Anadromous

Euryhaline

Catadromous

13 / 40

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

Upwelling

Downwelling

Thermohaline circulation

14 / 40

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

Exoskeleton

Endoskeleton

Shell

15 / 40

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

Rhizobia

Cyanobacteria

Mycorrhizae

16 / 40

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

Brackish ecosystems

Hypersaline ecosystems

Saline ecosystems

17 / 40

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

Phytoplankton

Zooplankton

Benthos

18 / 40

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

Phytoplankton

Mycorrhizae

Zooxanthellae

19 / 40

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

Zooplankton

Phytoplankton

Seagrasses

20 / 40

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

Ion regulation

Osmoregulation

Excretion

21 / 40

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

Aurelia

Mnemiopsis

Ctenophore

22 / 40

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

Osmosis

Diffusion

Active transport

23 / 40

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

Mussels

Seaweed

Jellyfish

24 / 40

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

Hypoxia tolerance

Anaerobic respiration

Anoxia adaptation

25 / 40

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

Jellyfish

Dinoflagellates

Anglerfish

26 / 40

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

Horizontal migration

Vertical migration

Diurnal migration

27 / 40

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

Reef

Estuary

Marsh

28 / 40

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

Nitrogen fixation

Nitrification

Denitrification

29 / 40

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

Phytoplankton

Benthos

Zooplankton

30 / 40

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

Oxygenation

Oxygen evolution

Oxygen fixation

31 / 40

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

Lichen

Mycorrhiza

Coral

32 / 40

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

Stenohaline

Anadromous

Euryhaline

33 / 40

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

Gravitaxis

Phototaxis

Chemotaxis

34 / 40

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

Hypoxia

Oligotrophication

Eutrophication

35 / 40

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

Biome

Ecotone

Habitat

36 / 40

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

Reptiles

Invertebrates

Fish

37 / 40

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

Nitrogen fixation

Denitrification

Nitrification

38 / 40

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

Ion regulation

Osmoregulation

Excretion

39 / 40

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

Estuary

Mangrove

Wetland

40 / 40

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

Mycorrhiza

Lichen

Coral

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adminJune 13, 2024Last Updated: October 13, 2024

0 5 2 minutes read