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 biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Hag fish is another name for

  1. Petromyzon

  2. Lamprey

  3. Myxine

  4. Cephalaspis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Myxine is scientific name of hagfish. They are eel-shaped, slime-producing marine fish. They are the only known living animals that have a skull but no vertebral column. Classification of Myxine is

Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Superclass: Cyclostomata
Class: Myxini
Order: Myxiniformes
Therefore, the correct answer is option C.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Lamprey (Petromyzon) belongs to

  1. Chondrichthyes

  2. Osteichythes

  3. Agnatha

  4. Amphibia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Class Chondrichthyes comes under the superclass Pisces. Most fishes are marine and a few live in the tropical rivers.
B. Class Osteichthyes comes under the superclass Pisces and includes lungfishes, lobbed finned fishes and ray-finned fishes.
C. Agnatha is a paraphyletic superclass of jawless fish and includes two class, Cyclostomata, and an extinct class Ostracodermi.
D. Class Amphibia comprises the animals that inhabit both land and water.
Lamprey (Petromyzon) belongs to class Cyclostomata under superclass Agnatha.
So, the correct answer is 'Agnatha'.
Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Teeth not found in

  1. Primitive jawless fishes

  2. Lampreys

  3. Sharks

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Teeth appear to have first evolved in sharks, and are not found in the more primitive jawless fish. Lampreys do have tooth-like structures on the tongue, these are in fact, composed of keratin, not of dentine or enamel, and bear no relationship to true teeth. 

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

The deep sea organisms having luminous or phosphorescent organ in their integument are

  1. Amphibians

  2. Fish

  3. Mammals

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bioluminescence is the production and emission of light by a living organism. Bioluminescence occurs widely in marine vertebrates and invertebrates, as well as in some fungi, microorganisms including some bioluminescent bacteria and terrestrial invertebrates such as fireflies. 

Multiple choice biology wastewater story basics of water pollution sewage treatment wastewater treatment - need and methods personal and public cleanliness who will do this? water borne disease hygiene - a key to healthy life

Waste water contains algae, fungi, bacteria and

  1. Crocodiles

  2. Snakes

  3. Rotifers

  4. Tigers
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Wastewater contains a diverse microbial community, including bacteria, fungi, algae, and protozoa like rotifers. Rotifers are microscopic multicellular organisms commonly found in wastewater treatment systems.

Multiple choice zoology why classification? nomenclature in classification introduction to plant kingdom history of classification nomenclature of animals

Which of the following is correct match of genetic name with it's common name?

  1. Exocoetus - flying frog

  2. Betta - Fighting fish

  3. Toad - Tree frog

  4. Pristis - Electric fish
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A flying frog is an Asian frog which has the ability to achieve gliding flight between trees. Its generic name is Rhacophorus nigropalmatus. The generic name of fighting fish is Betta splendens. It is also called as bettas. Two male fighting fish fight to protect territory. Hence, they are never be placed in the same tank. Tree frog is a frog that spends its most of the live in trees. Its generic name is Hyla arborea. Electric fish is a fish that generates electric field. Its generic name is Electrophorus electricus. It is also called as electric eel.

Thus, the correct answer is 'Betta - Fighting fish.'

Multiple choice zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

Diapsid skullis found in the following _________________.

  1. Crocodile, Turtle and Seymouria

  2. Sphenodon, Crocodile and Viper

  3. Matrix, Draco and Turtle

  4. Calotes, Cobra and Varanosaurus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diapsid skulls have two temporal fenestrae (openings) on each side of the skull. Among the options, Sphenodon (tuatara), Crocodile, and Viper (snakes) are all diapsid reptiles. Turtles are anapsids (no temporal openings), Seymouria is a temnospondyl amphibian, not a diapsid.

Multiple choice zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

Whale Fish is a member of

  1. Reptilia

  2. Arthopoda

  3. Coelenterata

  4. Mammalia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(A)Reptilia is a class of crawling animals where the members lay eggs.

(B)Arthropoda is a class of insects where the members are oviparous, they lay eggs.
(C)Coelenterate is a class where organisms are oviparous but fertilization is internal.
(D)Mammals are the organism which gives birth to their young ones, they are viviparous. Since the whale is viviparous.
So, the answer is 'Mammals'.

Multiple choice zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

Identify the aquatic mammals from the following :
(i) Balaenoptera
(ii) Equus
(iii) Delphinus
(iv) Pteropus
(v) Felis

  1. (i) and (iii) only

  2. (v) only

  3. (ii) and (iv) only

  4. (iv) and (v) only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Balaenoptera (blue whale) and Delphinus (dolphin) are aquatic mammals. Equus (horse), Pteropus (bat), and Felis (cat) are terrestrial.

Multiple choice zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

Choose the correct answers from the alternatives given.
Sharks and bony fish are different in that only:

  1. bony fish have paired fins

  2. bony fish have an operculum

  3. sharks have a bony skeleton

  4. sharks are predaceous
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sharks and bony fish are two fish groups. Sharks are cartilaginous fish. They have a cartilaginous skeleton. Bony fish have a skeleton made from calcified bones. Sharks and bony fish belong to the class Chondrichthyes and Osteichthyes respectively. This is the difference between sharks and bony fish. Bony fish also have an operculum. The operculum is a bony flap of skin over their gills that protects the gills. It opens and closes to help bony fish breathe when they are not swimming. Bony fish have scales, and most species have a fusiform body design.

So, the correct option is, 'bony fish have an operculum'.

Multiple choice zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

Identify the aquatic mammal(s) from the following: -
(i) Balaenoptera
(ii) Equus
(iii) Delphinus
(iv) Pteropus
(v) Felis

  1. (i) and (iii)

  2. (ii) and (iv)

  3. (v) only

  4. (iv) and (v)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Balaenoptera (Whale) and Delphinus (Dolphin) are aquatic mammals. Equus (Horse) and Felis (cat) are terrestrial and Pteropus (Flying fox) is a Prying mammal. So the correct option is A.

Multiple choice zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

Flightless aquatic birds belong to

  1. Ratitae

  2. Impennae

  3. Carinatae

  4. Odontognathae
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The duper order impennae constitutes birds which are flightless, with paddles like wings or flippers.these birds have webbed feet and can swim well.they are adapted to aquatic life.impennae belongs to the subclass neornithes of the class aves.