Aquatic Biology MCQs with Answers

adminJune 13, 2024Last Updated: October 13, 2024

0 5 2 minutes read

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

Please fill out the form before starting Quiz.

1 / 40

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

Zooplankton

Phytoplankton

Benthic organisms

2 / 40

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

Benthos

Zooplankton

Phytoplankton

3 / 40

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

Diurnal migration

Horizontal migration

Vertical migration

4 / 40

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

Lungs

Gills

Spiracles

5 / 40

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

Shell

Exoskeleton

Endoskeleton

6 / 40

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

Mussels

Seaweed

Jellyfish

7 / 40

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

Hydrological cycle

Carbon cycle

Nitrogen cycle

8 / 40

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

Anoxia adaptation

Hypoxia tolerance

Anaerobic respiration

9 / 40

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

Nitrogen fixation

Nitrification

Denitrification

10 / 40

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

Respiration

Photosynthesis

Diffusion

11 / 40

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

Coral

Lichen

Mycorrhiza

12 / 40

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

Osmoregulation

Excretion

Ion regulation

13 / 40

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

Osmosis

Diffusion

Active transport

14 / 40

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

Habitat

Ecotone

Biome

15 / 40

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

Benthos

Phytoplankton

Zooplankton

16 / 40

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

Mangrove

Estuary

Wetland

17 / 40

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

Plankton

Nekton

Benthos

18 / 40

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

Nitrification

Denitrification

Nitrogen fixation

19 / 40

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

Aurelia

Mnemiopsis

Ctenophore

20 / 40

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

Osmoregulation

Filtration

Respiration

21 / 40

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

Nutrient enrichment

Nutrient cycling

Nutrient loading

22 / 40

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

Brackish ecosystems

Saline ecosystems

Hypersaline ecosystems

23 / 40

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

Phytoplankton

Seagrasses

Zooplankton

24 / 40

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

Capillary action

Transpiration

Osmosis

25 / 40

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

Thermocline

Pycnocline

Halocline

26 / 40

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

Hypoxia

Eutrophication

Oligotrophication

27 / 40

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

Estuary

Reef

Marsh

28 / 40

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

Chemotaxis

Gravitaxis

Phototaxis

29 / 40

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

Excretion

Ion regulation

Osmoregulation

30 / 40

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

Mycorrhizae

Zooxanthellae

Phytoplankton

31 / 40

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

Oxygen fixation

Oxygenation

Oxygen evolution

32 / 40

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

Catadromous

Anadromous

Euryhaline

33 / 40

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

Aphotic zone

Benthic zone

Photic zone

34 / 40

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

Osmoregulation

Ion regulation

Excretion

35 / 40

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

Lichen

Mycorrhiza

Coral

36 / 40

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

Invertebrates

Fish

Reptiles

37 / 40

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

Anadromous

Euryhaline

Stenohaline

38 / 40

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

Mycorrhizae

Cyanobacteria

Rhizobia

39 / 40

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

Upwelling

Thermohaline circulation

Downwelling

40 / 40

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

Jellyfish

Dinoflagellates

Anglerfish

Download Certificate of Quiz Aquatic Biology

On the end of Quiz, you can download the certificate of the quiz if you got more than 70% marks. Add a certificate to your job application or social profile (like LinkedIn) and get more job offers.

If you are interested to enhance your knowledge regarding English, Physics, Chemistry, and Computer please click on the link of each category, you will be redirected to dedicated website for each category.

adminJune 13, 2024Last Updated: October 13, 2024

0 5 2 minutes read