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 zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

Which one of the following swallows mud?

  1. Amphioxus

  2. Sea squirt

  3. Tongue worm

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

A) Amphioxus is a filter feeder and does not swallow mud.

B) Sea squirts filter plankton and detritus out of water. They do not swallow mud.
C) Tongue worm are detritus feeders and do swallow mud.
D) Asymmetron is a cateogory of lancelet. Lancelets are filter feeders.
So, the answer is 'Tongue worm'.

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

Balanoglossus is commonly known as 

  1. Peacock worm

  2. Acorn worm

  3. Sand worm

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

Balanoglossus is an ocean-dwelling 'acorn worm', genus of Hemichordata. It is an 'evolutionary link' between invertebrates and vertebrates. It has a notochord in the upper part of the body and has no nerve chord. Hence, option B is correct.

Multiple choice evs the unique world of insects and animals sleeping time animal senses sense organs in animals sense organs in humans

Which of the following contains mechanoreceptors ?

  1. Human skin

  2. Lateral line of fishes

  3. Statocysts of arthropods

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mechanoreceptor - Receptor that responds to pressure,touch,  position, acceleration.

Example- Human skin, lateral line of fishes, statocysts of arthropods.

So, the correct option is 'All of these'.

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Members of which algal class impart red colour to red sea?

  1. Cyanophyceae

  2. Rhodophyceae

  3. Phaeophyceae

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

The red sea is the saltiest sea and connects to the ocean without any river meeting the sea. It is named so because of the abundant occurrence of red coloured planktonic cyanophyceae called Trichodesmium erythraeum. This cyanophyceae imparts red colour to red sea. This results in the algal bloom or red bloom.

Thus, the correct answer is 'Cyanophyceae.'

Multiple choice biology coordination and response control of blood glucose endocrine system and hormone hormones in human reproduction

............... is able to regulate its own body temperature.

  1. Frog

  2. Fish

  3. Snake

  4. Sparrow

  5. Turtle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Sparrow is able to regulate its own body temperature. A sparrow is the only animal out of that group that is endothermic.
Endothermic animals are those that must generate their own heat to maintain their body temperature. These animals are commonly referred to as "warm-blooded." An animal that is endothermic is categorized as an endotherm, and this includes all mammals. The opposite of an endotherm is an ectotherm.
Multiple choice

How many hearts does an Octopus have?

  1. One

  2. Two

  3. Three

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

Octopuses have three hearts. Two hearts pump blood to the gills, while the third pumps blood to the rest of the body.

Multiple choice

Which of the following is NOT an instinct?

  1. a fish swimming

  2. migration

  3. a dolphin doing tricks

  4. a spider spinning a web
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A dolphin doing tricks is a learned behavior. It requires training and reinforcement, whereas instincts are behaviors an animal is born knowing how to perform.