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

Octopus locomotes by

  1. muscular feet

  2. muscular arms

  3. tentacles

  4. contraction and relaxation of body muscles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Octopus has muscular arms for locomotion.

Multiple choice

Unlike most other fish, sharks have no

  1. bones

  2. teeth

  3. gills

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

Sharks are cartilaginous fish, meaning their skeletons are made of cartilage rather than bone. They still possess teeth, gills, and livers.

Multiple choice

Trimethylamine oxide is excreted by

  1. fresh water fishes

  2. amphibians

  3. marine teleosts

  4. some molluscs and marine teleosts
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Marine teleosts (bony fish) excrete trimethylamine oxide (TMAO) as a nitrogenous waste product to help maintain osmotic balance in their saline environment.

Multiple choice

The excretory substance is ammonia in

  1. camel

  2. cartilagenous fishes

  3. whale

  4. fresh water fishes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Freshwater fish are ammonotelic, meaning they excrete ammonia as their primary nitrogenous waste. Ammonia is highly toxic but water-soluble, and freshwater fish have ample water to dilute and excrete it.

Multiple choice

Neoceratodus is a connecting link between

  1. Cyclostomes and Fishes

  2. Fishes and Amphibians

  3. Amphibians and Reptiles

  4. Molluscs and echinoderms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Neoceratodus, or the Australian lungfish, is considered a living fossil that exhibits characteristics of both fishes and amphibians, serving as a connecting link between these two groups.

Multiple choice

Stenohaline fishes are represented by :

  1. fresh water fishes only

  2. marine fishes only

  3. those which can tolerate a narrow range of salinity in water

  4. those which can tolerate a wide range of salinity in water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stenohaline fishes are represented by those which can tolerate a wide range of salinity in water. 

Multiple choice

Which of the following is an/are ammoniotelic animal(s)?

  1. Humans

  2. Pigeon

  3. Fish

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

Ammoniotelic animals are those that excrete nitrogenous waste primarily as ammonia. This is common in aquatic animals like fish, which have access to abundant water to dilute the highly toxic ammonia.