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

Lung fish is

  1. Prolopten

  2. Coelacanth

  3. Scoliodon

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

Lungfish (also known as salamanderfish) are freshwater fish belonging to the subclass Dipnoi.

Multiple choice

Snake poison is hemotoxic in

  1. Python

  2. Viper

  3. Eiyx

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

Hemotoxins, haemotoxins or hematotoxins are toxins that destroy red blood cells (that is, cause hemolysis), disrupt blood clotting, and/or cause organ degeneration and generalized tissue damage.

Multiple choice

Red tide is mostly caused by

  1. Noctiluca

  2. Gymnodinium

  3. Symbiodinium

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

Red tide is a common name for a phenomenon more correctly known as an algal bloom (large concentrations ofmicroorganisms), an event in which estuarine, marine, or fresh water algae accumulate rapidly in the watercolumn and results in discoloration of the surface water. It is usually found in coastal areas. Gymnodinium is agenus of dinoflagellates

Multiple choice

Book gills are associated with

  1. excretion

  2. respiration

  3. nutrition

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

Book gills are respiratory organs in limulus or king crab.

Multiple choice

Frog's tadpole is

  1. uricotelic

  2. ammonotelic

  3. ureotelic

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

Frog's tadpole is ammonotelic.

Multiple choice

Pisces belong to which of the following categories?

  1. Oviparous

  2. Viviparous

  3. Saprophyte

  4. Egg laying mammal
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oviparous: are the animals that reproduce by means of eggs that develop and hatch outside the mother's body. Examples are birds, fishes, insects and reptiles. Therefore, fish belongs to oviparous category. 

Multiple choice

Dog fish belongs to the class of ______.

  1. pisces

  2. mammalia

  3. reptilia

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

Dog fish (Generic name - Scolidon) also known as small shark belongs to class- Pisces (fishes). They are exclusively water living. Their skin is covered with scales or plates. They obtain oxygen dissolved in water with the help of gills. The body is streamlined and a muscular long tail is used for movement in water. They are cold-blooded and have two-chambered heart. They lay eggs (Oviparous). 

Multiple choice

Largest known fish in the sea is

  1. Whale

  2. Dolphin

  3. Whale Shark

  4. Hammer headed fish
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The whale shark (Rhincodon typus) is the largest known extant fish species. Despite the name, it is a shark, not a whale.