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

Which organ of the fish helps to change body direction and acts as a balancer?

  1. Gills

  2. Flat fins and tail

  3. Streamlined body

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

The body of a fish is well adapted to swim in water. They have got a streamlined body to cut the currents of water, gills in fish helps it to respire well in water. Also it is able to swim in water without sinking down due to the presence of flat fins and tail which help the fist in maintaining balance and in changing body direction.

Multiple choice

Heart of a fish is special because

  1. it has no blood at all

  2. it has arterial blood only

  3. it has venous blood only

  4. it has partly arterial and partly venous blood
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heart of a fish is special because it has venous blood only as they have a closed-loop circulatory system.

Multiple choice

The shape of fish is streamlined to

  1. Increase fluid friction

  2. Facilitate breathing

  3. Change the direction

  4. Decrease fluid friction
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The shape of fish is such that to reduce fluid friction to ensure smooth motion.

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

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).