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

Sea hare belongs to

  1. mammalia

  2. mollusca

  3. annelida

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

Sea hares (Aplysia) are marine gastropod mollusks, belonging to phylum Mollusca. They are sea slugs, not mammals, annelids, or fish. The name 'hare' refers to their ear-like rhinophores, not their actual classification.

Multiple choice

Which of the following animals is a deuterostome?

  1. starfish

  2. sea anemone

  3. ant

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

Deuterostomes are animals where the blastopore becomes the anus during embryonic development. Starfish (echinoderms) are deuterostomes. Sea anemones (cnidarians), ants (arthropods), and octopuses (mollusks) are protostomes.

Multiple choice

Match the fishes given in Column I to their important features in Column II.

 
Column I Column II
A. Echeneis

B. Torpedo C. Chenocephalus D. Hippocampus | i. Only vertebrate without haemoglobin ii. Males have brood pouches iii. Dorsal fin is modified into sucker iv. Generate electric current |

  1. A – ii, B – i, C – iv, D – iii

  2. A – iii, B – iv, C – i, D – ii

  3. A – iii, B – ii, C – iv, D – i

  4. A – ii, B – iv, C – i, D – iii
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Torpedo generates electric current.

Multiple choice

The group tetrapoda includes

  1. pisces, amphibia and reptiles

  2. pisces, reptiles and aves

  3. reptiles, aves and mammals

  4. amphibian, reptiles, aves and mammals
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tetrapoda is an informal grouping that includes vertebrate animals that have four limbs, i.e. amphibians, reptilies, aves and mammals.

Multiple choice

Lateral line sensory organ is mainly a characteristic of

  1. aquatic reptiles

  2. aquatic birds

  3. fish

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

The lateral line system is a mechanosensory organ found in fish and some aquatic amphibians. It detects water movement, pressure changes, and vibrations, helping fish navigate, avoid predators, and locate prey. It consists of a series of pores and canals containing neuromasts (sensory cells) along the body sides.

Multiple choice

Fish is _______ animal.

  1. an arboreal

  2. an aerial

  3. an aquatic

  4. an amphibian

  5. a terrestrial
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The fish is an aquatic animals.  

Multiple choice

I am the largest and the strongest crawler on the earth. I can swallow my prey whole. I have legs and a strong tail. I can live in water as well as on land but prefer to live in water most of time. Guess who am I?

  1. Cobra

  2. Viper

  3. Lizard

  4. Crocodile

  5. Turtle

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

Crocodile is the largest and the strongest crawler on the earth. It can swallow its prey whole. It has four legs and a strong tail. It can live in water as well as on land but prefers to live in water.

Multiple choice

Which of the following are examples of sanguivores?

  1. Plasmodium, Nereis and Leech

  2. Leech, Lamprey and Cockroach

  3. Cockroach, Frog and Nereis

  4. Leech, Bed bug and Lamprey

  5. Bed bug, Cockroach, Frog
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Leech, Bed bug and Lamprey: All are sanguivores (blood suckers).

Multiple choice

Four chambered heart is found in __________.

  1. cockroach and fishes

  2. fishes and amphibians

  3. birds and mammals

  4. mammals and fishes

  5. amphibians and birds
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Birds: 4 chambered heart Mammals: 4 chambered heart