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

Multiple choice

In an aquarium what would you see

  1. fish eating plants

  2. plants need air

  3. sun heats the water

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

In an aquarium, you would observe living organisms like fish interacting with their environment, such as eating plants.

Multiple choice biology animal world oviparous and viviparous diversity and classification in animals adaptations in animals

Birds that wade in water have

  1. Webbed feet

  2. Clawed feet

  3. Long legs

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

Some birds, like cranes, wade in the water. They have long feet and toes. Along with long feet, they are also seen having long necks. As they move around in shallow waters, having long feet helps them in keeping their feathers high above the surface of the water. Thus they are kept dry and don't get wet with water even when the birds search for food inside water. This forms a part of their important adaptive behavior.

So, option C ''Long legs'" is the correct answer.

Multiple choice biology animal world oviparous and viviparous diversity and classification in animals adaptations in animals

Animal that lives only in water and also reproduces in water is

  1. Frog

  2. Crocodile

  3. Turtle

  4. Fish
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Fish lives only in water because the gills of the fish which act as a respiratory organ, can take oxygen only from water and not from the air. Hence it is necessary for them to live in water. 
  • Fertilization is external in most fish species. Large quantities of eggs and sperm are simultaneously released into the water by females and males. This process of egg release is termed spawning.
  • So, the correct answer is 'Fish'.
Multiple choice biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

Fertiliser obtained from sea birds along the coast of Chile and Peru is

  1. Guano

  2. Bone meal

  3. Dung

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

Guano is the accumulated excrement of seabirds and bats. As a manure, guano is a highly effective fertilizer due to its exceptionally high content of nitrogen, phosphate and potassium: nutrients essential for plant growth.Seabird guano consists of nitrogen-rich ammonium nitrate and urate, phosphates, as well as some earth salts and impurities. Bat guano is faecal excrement from bats. Commercially harvested bat guano is used as an organic fertilizer. All commercially sold bat guano is derived from insect-eating bats.

Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

Which of the following options is correct?
     Steno thermal                                         Eurythermal 
      organism                                                organism            

  1. Frog, Lizard

  2. Frog, Man

  3. Man, Lizard

  4. Polar bear, Coconut tree
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Organisms with narrow range of temperature tolerance are called steno thermal organisms, e.g. polar bear, frog, lizards, coconut, etc. The organisms with wide range of temperature tolerance are called eurythermal organisms e.g. most mammals and birds. 

Multiple choice

What is a barracuda?

  1. Crocodile

  2. Buck

  3. Bird

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

A barracuda is a large, predatory ray-finned fish known for its fearsome appearance and ferocious behavior. It is not a bird, mammal, or reptile.

Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure

If a sweet water fish enters a sea, the fish will

  1. swell

  2. be squeezed

  3. remain as it is

  4. suffer none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Liquid pressure is given by =$\rho \times g \times h$

The water from river has a lower density than the sea water. So, at equal depth, sweet water or river water exerts less pressure than sea water. Body of a sweet water fish is habituated with this lower pressure of river water. Naturally, when the fish will enter the sea, it will suffer greater pressure due to increase in density and hence the body of the fish will be squeezed slightly.

Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure

If a sea fish enters a river, the fish will

  1. swell

  2. be squeezed

  3. remain as it is

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

Density of sea water is more than that of river water. So, at same depth, sea water exerts greater pressure. And, the body of the sea fish is habituated with the high pressure from outside. Now, as the same fish enters the river, water density being low, will suffer less pressure from outside. As a result, the body of the fish will swell out slightly.

Multiple choice zoology animal diversity - ii (phylum: chordata) amphibia and reptilia amphibia classifications of chordata

A non-poisonous snake is______________.

  1. Viper

  2. Python

  3. Bungarus

  4. Sea snake
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Vipers are a family of venomous snakes, the Viperidae. All have long, hinged fangs that dig deep into their prey and inject venom. 
  • Sea snakes are venomous. They are typically found in Indo-Australian and Southeast Asian waters.  
  • Bungarus is a genus of venomous elapid snakes, the kraits found in South and Southeast Asia.  
  • Pythons are a family of non-venomous snakes, the Pythonidae found in Africa and Asia. 
  • so the correct answer is option B.