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

A major part of freshwater fish is caught in _____.

  1. eastern and southern Asia

  2. western Africa

  3. south America

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

Eastern and southern Asia (particularly China, India, Bangladesh, and Southeast Asia) dominate freshwater fish production due to extensive river systems, lakes, traditional aquaculture practices, and high fish consumption in diets. China alone produces over 60% of world's freshwater fish. Western Africa and South America have lower production.

Multiple choice

Which of the following animals does not have gall bladder?

  1. Frog

  2. Wall lizard

  3. Rat

  4. Rabbit

  5. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rats lack a gall bladder, so bile flows directly from the liver to the duodenum via the common bile duct. This adaptation is related to their nearly continuous feeding pattern. Frogs, wall lizards, and rabbits all possess gall bladders for bile storage and concentration.

Multiple choice

Snails, beetles, worms, jellyfish, octopuses etc. are animals without backbone. They are called as ____.

  1. insects

  2. reptiles

  3. vertebrates

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

Invertebrates are animals that lack a vertebral column (backbone or spine). This group includes diverse animals like snails (mollusks), beetles (arthropods), worms (annelids), jellyfish (cnidarians), and octopuses (mollusks). Vertebrates, like humans, dogs, and birds, have a backbone. The term 'invertebrate' comes from 'in-' meaning 'without' and 'vertebra' meaning 'joint' or 'backbone'.

Multiple choice

Which of the following groups of animals is cold-blooded?

  1. Salamander, toad, seahorse, horse

  2. Salamander, toad, seahorse, dog fish

  3. Salamander, toad, dog, dog fish

  4. Salamander, toad, seahorse, seal

  5. Salamander, toad, horse, dog
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ambhibians and fish are cold-blooded animals. Salamander and toad are ambhibians. Seahorse and dog fish are fish.

Multiple choice

Which of the following organisms in a pond are secondary consumers?

  1. Aquatic crustaceans and racoons

  2. Ducks and carnivorous fish

  3. Ducks and minnows

  4. Carnivorous fish and aquatic crustaceans

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

Ducks and carnivorous fish in a certain pond are secondary consumers. Secondary Consumers are the organisms which depend on the primary consumers for food. Ducks and carnivorous fishes are considered as secondary consumers in a pond ecosystem because they consume zooplankton which is the primary consumer. 

Multiple choice

Which of the following is not an amphibian?

  1. Salamander

  2. Toad

  3. Hyla

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

Turtles are reptiles, not amphibians. They have dry, scaly skin, lay amniotic eggs on land, and lack an aquatic larval stage. Salamanders, Toads, and Hyla (tree frogs) are all amphibians. This question tests understanding of the distinction between reptiles and amphibians.