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 zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

An animal which has notochord throughout its life is

  1. Fish

  2. Bird

  3. Snake

  4. Amphioxus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The notochord is a cartilaginous structure which supports the body. It is formed by vacuolated cells. They are filled with fluid. These turgid cells will give strength to the notochord. This notochord is covered by a sheath of connective tissue. Amphioxus has notochord throughout its life. The notochord extends from the anterior end to the posterior end. It is placed below the dorsal nerve cord and above the alimentary canal. 
So, the correct answer is option D.
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 zoology insects and human welfare bee keeping apiculture apiculture, sericulture and fisheries

Hypophysation is done in major carps :

  1. To increase size

  2. To increase their growth

  3. To cause breeding in fisheries

  4. To increase their palatability
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hypophysation is the technique of injecting pituitary gland extract into fish to induce spawning and breeding in captivity, which is essential for commercial aquaculture.

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.