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

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

Peripatus is a connecting link between

  1. aves and fishes

  2. reptiles and birds

  3. fishes and amphibians

  4. arthropods and annelids
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Peripatus is a connecting between arthropods and annelids. 

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.

Multiple choice

Ammoniotelic animal(s) is/are

  1. fish

  2. hydra

  3. salamander

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

Ammoniotelic animals include many aquatic invertebrates, bony fish, and larval amphibians, as they excrete ammonia directly into their water-rich environment.

Multiple choice

How do the fish survive under water?

  1. By jumping out of water to breathe in air

  2. By taking in oxygen dissolved in water

  3. By eating food rich in oxygen

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

The aquatic animals survive under water by taking in oxygen dissolved in water. 

Multiple choice

Radial symmetry is best seen in

  1. Fishes

  2. Jelly fish

  3. Star fish

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

Radial symmetry is basically the regular arrangement of body parts around a central axis.