Biology · General Awareness

Aquatic and Marine Biology

1,834 Questions

This hub covers key concepts in aquatic and marine biology, including fish anatomy, marine animal behavior, and commercial fisheries. These topics are essential for general science sections in various competitive exams. Use these resources to test your knowledge of diverse aquatic ecosystems.

Marine animal adaptationsCommercial fisheriesFish anatomyAquatic ecosystems

Aquatic and Marine Biology Questions

Multiple choice

Which one of the following is not a true fish?

  1. Shark

  2. Starfish

  3. Eel

  4. Sea-horse
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A starfish is not a 'true fish' because it is an invertebrate belonging to the phylum Echinodermata, lacking a backbone and gills. Sharks, eels, and seahorses are all vertebrates that belong to the class of fish (Chondrichthyes or Osteichthyes).

Multiple choice

Directions: In the following question, you are given a group of five words, out of which four are similar in some manner and the fifth one is different. You are required to choose the word which does not belong to the given group.

  1. Whale

  2. Tuna

  3. Shark

  4. Cod

  5. Starfish
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Whale is a mammal, while Tuna, Shark, and Cod are fish. Although Starfish is an invertebrate, Whale is the primary odd-one-out because it is a mammal.

Multiple choice

Which of the following organisms have single blood circulation?

  1. Fishes

  2. Mammals

  3. Birds

  4. Amphibians

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In fishes, blood passes through the heart only once during a complete circuit of the body, which is known as single circulation. The heart pumps deoxygenated blood to the gills, where it is oxygenated and then sent directly to the rest of the body. Mammals, birds, and amphibians have double circulation or variations of it.

Multiple choice

Heart is completely four chambered in _______.

  1. amphibians

  2. reptiles

  3. birds

  4. fishes

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Birds and mammals have a completely four-chambered heart, which prevents the mixing of oxygenated and deoxygenated blood. Most reptiles have a three-chambered heart with a partial septum (except crocodiles), while amphibians have three chambers and fishes have two. This complete separation allows for a more efficient supply of oxygen to tissues.

Multiple choice

What is the scientific name of Zebra fish?

  1. Danio Rerio

  2. Vaenice Rome

  3. Gallne Rai

  4. Stemen Gok
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The scientific name for the zebrafish is Danio rerio. It is a popular model organism in scientific research.

Multiple choice

Aquatic organisms are

  1. marine organisms

  2. fresh water organisms

  3. Both 1 and 2

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aquatic organisms are those that live in water. This category includes both marine organisms (saltwater) and freshwater organisms.

Multiple choice

Which organ helps fish to change its direction in water?

  1. Tail fin

  2. Frontal fins

  3. Neck

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The tail fin of a fish acts as a rudder, allowing the fish to steer and change direction in the water. Other fins are primarily used for stability and propulsion.

Multiple choice

Depending on their habitats, animals can be grouped as

  1. aquatic animals

  2. terrestrial animals

  3. amphibians

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Animals are classified by their habitats into aquatic (water), terrestrial (land), and amphibians (both). Since all these categories are listed, 'all of these' is the correct choice.

Multiple choice

Which of the following is/are not an adaptation of fishes?

  1. Streamlined body

  2. Fins

  3. Very light and hollow bones

  4. Special coverings like scales, waxy coatings etc.

  5. Gills

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as this is not an adaptation of fishes. Fishes do not have very light and hollow bones.

Multiple choice

Match the following:

 
a. Aquatic animals 1. They are the organisms that live in water. Example: Fish
b. Amphibious animals 2. They are the organisms that live on trees. Example: Monkey
c. Arboreal animals 3. They are the organisms that live both on land and in water. Example: Frog

  1. a - 1, b - 2, c - 3

  2. a - 1, b - 3, c - 2

  3. a - 3, b - 1, c - 2

  4. a - 3, b - 2, c - 1

  5. a - 2, b - 3, c - 1
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. Aquatic animals are the organisms that live in water. Example: Fish. Amphibious animals are the organisms that live both on land and in water. Example: Frog. Arboreal animals are the organisms that live on trees. Example: Monkey