Biology · General Awareness
Aquatic and Marine Biology
1,905 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
C
Correct answer
Explanation
All the mammals have lungs as their respiratory organ. Out of the given options, only dolphin is a mammal and thus, has lungs as a respiratory organ.
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Gills
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Paired fins
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Streamlined bodies
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Scales
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Tail
C
Correct answer
Explanation
The streamlined shape of the fish help them to reduce friction with water.
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Tapeworm
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Cockroach
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Frog
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Lizard
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Star fish
C
Correct answer
Explanation
A frog excretes urea and thus, is a ureotelic animal.
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diffusion
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exosmosis
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endosmosis
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plasmolysis
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deplasmolysis
C
Correct answer
Explanation
The movement of water molecules takes place from outside to inside due to endosmosis and hence, marine fish when thrown under tap water bursts.
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Physalia : Portuguese man-of-war
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Adamsia : Sea anemone
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Pennatula : Sea pen
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Gorgonia : Sea fan
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Meandrina : Sea leather
E
Correct answer
Explanation
Meandrina is called as Brain coral.
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Hagfish
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Angel fish
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Fighting fish
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Saw fish
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Dog fish
A
Correct answer
Explanation
Hagfish (Myxine) belongs to Class–Cyclostomata. Theirbody is devoid of scales and paired fins.
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Saw fish
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Sea horse
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Flying fish
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Salamander
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Angel fish
A
Correct answer
Explanation
Pristis (Saw fish) belongs to Class–Chondrichthyes. Theyhave internal fertilisation and many of them are viviparous.
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Leucosolenia
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Euspongia
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Euplectella
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Spongilla
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Sycon
C
Correct answer
Explanation
Yes, it is correct. It is the sponge known as a venus flower basket of phylum porifera.
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1) and 2)
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2) and 3)
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1) , 2) and 3)
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Only 2)
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1) and 3)
E
Correct answer
Explanation
Yes, it is correct. Pisces are divided into two classes, chondrichthyes (cartilaginous) and Osteichthyes(bony).
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Only 2)
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1), 3) and 4)
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Only 4)
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2) and 4)
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2) and 3)
B
Correct answer
Explanation
Yes, it is correct. 1) is the mandarin fish, 3) is the angler fish and 4) is the lion fish.
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slime
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scales
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operculum
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fins
C
Correct answer
Explanation
The operculum is a bony flap that covers and protects the gills on each side of a fish's head. It plays a crucial role in the respiratory mechanism by opening and closing to allow water flow over the gills while preventing debris from entering.
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bony fish
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cartilaginous fish
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jawless fish
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ray fish
B
Correct answer
Explanation
In cartilaginous fish (Chondrichthyes like sharks and rays), the mouth is positioned ventrally on the underside of the head. This is a key anatomical difference from bony fish (Osteichthyes), which typically have terminal mouths at the anterior end. Jawless fish and ray fish are not the correct classification for this characteristic.
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bony fish
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sword fish
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angler fish
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puffer fish
A
Correct answer
Explanation
Fish are classified into three major groups based on their skeletal structure: jawless fish (Agnatha) like lampreys, cartilaginous fish (Chondrichthyes) like sharks and rays, and bony fish (Osteichthyes) which comprise the majority of fish species. The other options are specific types of bony fish, not a distinct category.
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Silverfish - Elasmobranch
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Crayfish - Osteichthyes
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Cuttlefish - Echinodermata
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Jellyfish - Scyphozoa
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NA
D
Correct answer
Explanation
Jellyfish are the major non-polyp form of individuals.
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Placoid scales
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Ganoid scales
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Cycloid scales
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No scales
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NA
C
Correct answer
Explanation
Cycloid scales are found in salmon and carp.