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 biology biology : an introduction characteristics of life living world and classification attributes of living organisms

Fish breathe through

  1. Gills

  2. Lungs

  3. Stomata

  4. Skin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In aquatic animals such as fish, respiration takes place through special respiratory organs called gills. Gills are present on lateral sides of the head of fish. It is made of gill filaments present on gill arches which are heavily supplied with blood capillaries for an exchange of gases. the filaments increase the area of absorption.
Hence the correct option is A "gills".
Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Which of the following is incorrect w.r.t scientific names of the given animal?

  1. Brain coral - meandrine

  2. portuguese man of war - physalia

  3. Venus flower basket - Euplectella

  4. bath sponge - spongilla
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Brain coral is typically of the genus Diploria or similar; 'meandrine' is a descriptive term for its shape, not a scientific genus name. The other options correctly match the common names to their respective genera.

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Which of the following explains correctly that salmon return to their specific home stream to spawn?

  1. Pheromones

  2. A Reflex

  3. Imprinting

  4. Classical conditioning

  5. Circadian rhythms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Imprinting is defined as a learning process in which an offspring establishes species specific behaviour patterns along with recognition and attraction towards individuals of own species and even certain specific individuals (like parents). This process is classified as phase sensitive learning independent of external behaviour or other characteristics. In case of salmons, it has been theorized by Wisby and Hasler that they imprint on the unique odour of the natal water and as adults follow the same odour cues to their birth homes for spawning. Hence the correct answer is 'Imprinting'.   

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Which of the following will have the maximum concentration of harmful chemicals in its body ? Eagle, Grass, Snake, Frog, Grasshopper

  1. grass

  2. eagle

  3. snake

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

Here the food chain be :
Grass Grasshopper Frog Snake Eagle The organism which occurs at the highest trophic level in the food chain will have the maximum concentration of harrnful chemicals in its body. since, eagle occurs atthe highest trophic level, therefore, it will have the maximum concentration of harrnful chemicals in its body.

Multiple choice biology classification of living organisms binomial nomenclature nomenclature of organisms naming of the organisms nomenclature in classification

Vernacular names may be misleading. Which of the following is an example of that? 

  1. Star fish is not a fish at all

  2. Silver fishes are typical fishes

  3. Spiderlily is not a plant

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

  • Vernacular names or common names are based on the normal language of everyday life. These can be misleading as different languages have different names of organisms. Also, they are named according to the common knowledge of people and for their ease making not systematically or scientifically. 
  • Starfish is actually an echinoderm and not a fish.
  • Silver fishes are rather members of Arthropoda and spider lily is a plant.
So, the correct option is 'All of the above'.

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

Which animal have porphyropsin instead of pigment rhodopsin in rods? 

  1. Fish

  2. Birds

  3. Reptiles

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

In the rods of fresh water fishes, rhodopsin is replaced by the purple photolabile pigment porphyropsin. This participates in a retinal cycle identical in form with that of rhodopsin, but in which new carotenoids replace retinene and vitamin A.

Multiple choice biology diseases and hygiene diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Which of the following is commonly known as fish tapeworm?

  1. Taenia solium

  2. Taenia saginata

  3. Diphyllobothrium latum

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

Diphyllobothrium is a genus of tapeworms which can cause diphyllobothriasis in humans through consumption of raw or undercooked fish. The principal species causing diphyllobothriasis is Diphyllobothrium latum, known as the broad or fish tapeworm, or broad fish tapeworm.

Multiple choice biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

In which animal there is no blood for transport of nutrients?

  1. Fish

  2. Hydra

  3. Sponges

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All vertebrates possess a muscular chambered heart. Fishes have a 2-chambered heart with an atrium and a ventricle. In fishes, the blood transports nutrients when the heart pumps blood throughout the body. Animals like hydra and sponges do not possess any circulatory system. The water in which they live brings food and nutrients as it enters their body. The water carries waste materials and carbon dioxide as it moves out. Hence In animals like hydra and sponges, there is no blood for transport of nutrients.

So, the correct answer is 'Both B and C'.

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

Balanoglossus is connecting link between 

  1. Non- chordates and chordates

  2. Cartilaginous and bony fishes

  3. Bony fishes and amphibians

  4. Amphibians and reptiles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Connecting links are good evidences of organic evolution. These There are organisms exhibit intermediate characteristics of two taxonomic groups. Balanoglossus is a connecting link between non-chordates and chordates. Chimaera is a connecting link between cartilaginous and bony fishes. Coelocanth is a connecting link between bony fishes and amphibians. Sphenodon is a connecting link between amphibians and reptiles.

Thus, the correct answer is 'Non-chordates and chordates.'

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.