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 evs water in our life where do we get water from? why conserve water uses of water

Animal that can change its colour is 

  1. Planaria

  2. Octopus

  3. Leech

  4. Hydra
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Squids, octopuses, and cuttlefishes are among the few animals in the world that can change the colour of their skin in the blink of an eye.
  •  These cephalopods a group of molluscs with arms attached to their heads can change their skin tone to match their surroundings, rendering them nearly invisible, or alternatively give themselves a pattern that makes them stand out. 
  • Hence, Animal that can change its colour is Octopus.
  • So, the correct answer is 'Octopus'.
Multiple choice zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

Which of the following is a catfish?

  1. Labeo rohita

  2. Catla catla

  3. Cirrhina mrigala

  4. Wallago attu
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A. Labeo rohita, known as the carp fish, is found in sluggish and clear streams.
B. Catla catla, known as the major carp, is a freshwater fish.
C. Cirrhina mrigala is a ray finned fish in the genus Cirrhina.
D. Wallago attu is a freshwater catfish in the family Siluridae.
So, the correct answer is 'Wallago attu'.
Multiple choice zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

Pectoral fins are enlarged in

  1. Hippocampus

  2. Exocoetus

  3. Coccosteus

  4. Scoliodon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A. Hippocampus, commonly known as sea horse, is a small marine fish.
B. Exocoetus is known as flying fish. It has a powerful tail by which it is able to make large jumps over the surface of water. It has enlarged pectoral fins.
C. Coccosteus is a genus of extinct placoderm fishes.
D. Scoliodon is known as Dog fish. It has powerful sense of smell like that of a dog.
So, the correct answer is 'Exocoetus'.
Multiple choice zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

Heart pumps only impure blood in case of

  1. Sharks

  2. Whale

  3. Lizard

  4. Frog
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The heart pumps only impure blood in sharks. Sharks have a two-chambered heart which is an S-shaped tube. It has an atrium and ventricle. The blood is pumped by the heart through the afferent branchial arteries to capillaries in the gills, where the blood is oxygenated). 
  • The blood then flows through efferent branchial arteries, through the tissues of the body, and back to the heart in veins. Sharks have low blood pressures; the walls of the pericardium are rigid, creating suction within the pericardium to maintain the flow of blood. To circulate blood throughout their bodies, many sharks must swim continuously. 
  • The blood flow is similar to humans because blood is pumped by the heart to the rest of the body by arteries and returned to the heart by veins. 
  • A difference is that humans have 4-chambered hearts while sharks only have two chambers.
Multiple choice zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

Which one of the following is an example of viviparous animal?

  1. Amphibians

  2. Bony fish

  3. Fish

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

Viviparous sharks give birth to live young. The number of pups in a litter ranges from 2-20 or more. For example, the Bull sharks, Whitetip reef shark, Lemon shark, Blue shark, Mako, Porbeagle, Salmon shark, the Silvertip shark, and Hammerheads.

Amphibians are oviparous because the young hatch after the egg is laid.
Bony fish and fish are oviparous in nature.

Multiple choice evolutionary changes in heart transportation - the circulatory system

Which of the following has a 3 chambered heart?

  1. Salamander

  2. Fish

  3. Crocodile

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

Vertebrates have evolved a muscular heart to pump blood to body parts. Fishes have two chambered heart. Birds and mammals have four chambered heart, having two auricles and two ventricles. Reptiles, except crocodile, have three chambered heart. Crocodiles have four chambered heart. Thus Dolphin being a mammal has four chambered heart. Salamander being an amphibian has a three chambered heart.

Multiple choice evolutionary changes in heart transportation - the circulatory system

Four chambered heart is present in 

  1. Frog

  2. Crocodile

  3. Shark

  4. Lizard
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Among reptiles the heart is 3- chambered but the crocodile is an exception where the heart is 4- chambered but not completely divided. The left and right aorta are connected by a hole called the foramen of Panizza. The frog heart has 3 chambers: two atria and a single ventricle. Sharks have a two-chambered heart, with an atrium (also called the auricle) and a ventricle. Lizard also has three chambered heart. 
Thus, the correct answer is option B.
Multiple choice evolutionary changes in heart transportation - the circulatory system

The number of chambers in the heart of fish are

  1. One

  2. Two

  3. Three

  4. Four
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Fish heart is made up of 2 chambers- one auricle and one ventricle, The auricle receives the deoxygenated blood which then passes to ventricle and then to whole of the body. 
Therefore, the correct answer is option B.
Multiple choice biology biodiversity and its classifications life introduction to plant kingdom classification of organisms

Term vertebrate and invertebrate are given by 

  1. John Ray

  2. Linneaus

  3. Lamark

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

Lamarck, the French naturalist was the one who introduced the taxonomic distinction between vertebrates and invertebrates.
John ray was the first to give the definition of 'species'.
Carl Linnaeus gave the 'binomial nomenclature' for living beings.

Leuckart is remembered for his work in parasitology, particularly research regarding tapeworm and trichinosis. 
So, the correct answer is option C.

Multiple choice zoology frog introduction to reproduction reproductive system in frog frog - digestive system, circulatory system, excretory system and reproductive system

Tadpole larva of frog feed upon?

  1. Yolk sac

  2. Zooplanktons

  3. Protozoa

  4. Aquatic vegetations
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Tadpole larva has a rudimentary mouth which is not highly developed. Thus frog tadpole is a herbivore, feeding on relatively simpler food found available in the aquatic systems, such as Zooplanktons. Upon growth, tadpole larva undergoes metamorphosis where the mouth and internal organs will be rearranged to develop an adult carnivorous lifestyle.


Thus, the correct option is "(B) Zooplanktons".

Multiple choice zoology frog introduction to reproduction reproductive system in frog frog - digestive system, circulatory system, excretory system and reproductive system

Frog reproduces

  1. In water

  2. On trees

  3. In sand

  4. On lotus flowers in water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Frog reproduces in water. They are oviparous and they lay eggs in water which is fertilised outside the body of the frog. In order to make sure that the sperm reaches the eggs, the male and female get into a mating posture called amplexus. so, the correct answer is option A.

Multiple choice rivers - means of livelihood evs

Hilsa ilisha is the scientific name of which fish?

  1. Pulasa

  2. Rohu

  3. Pomfret

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

Hilsa ilisha is the scientific name for the fish commonly known as Hilsa or Pulasa in the Godavari region.