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 evs respiration in organism human respiration the mechanism of breathing breathing and its movements

The two organisms which breathe only through their moist skin are.

  1. Frog and Earthworm

  2. Fish and Frog

  3. Fish and Earthworm

  4. Leech and Earthworm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Frogs and earthworms are classic examples of organisms that utilize cutaneous respiration, meaning they breathe through their moist skin. While frogs also have lungs, their skin is a primary respiratory surface, and earthworms rely entirely on cutaneous respiration.

Multiple choice geography economic activity people and resources utilisation of europe europe - peninsula of asia continents: europe

The main fishes of European countries are ______________.

  1. Herring

  2. Haddock

  3. Cod

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

Cod, haddock and bass are all common examples of round fish. The majority of these fish species can be found in relatively shallow water; as a result they are regularly caught by sea anglers across the Europe.

Species found in these waters include redfish, sea trout, snook and striped bass. Some fish live in saltwater, but swim up streams and rivers to spawn (lay their eggs). These fish are called anadromous fish. They include shad, salmon, and some types of trout.

Multiple choice geography economic activity people and resources utilisation of europe europe - peninsula of asia continents: europe

Which of the following has the greatest importance in commercial fisheries?

  1. Spain

  2. Dogger Banks

  3. Italy

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

During the last ice age the bank was part of a large landmass connecting Europe and the British Isles, now known as Doggerland. It has long been known by fishermen to be a productive fishing bank; it was named after the doggers, medieval Dutch fishing boats especially used for catching cod.

At the beginning of the 21st century, the area was identified as a potential site for the UK round 3 wind farm, being developed as Dogger Bank Wind Farm.

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

Which among the following is likely to have the highest levels of DDT deposition in its body?

  1. Sea gull

  2. Phytoplankton

  3. Eel

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

Chlorinated hydrocarbons like DDT pass into the food chain and increase in amount per unit weight of organisms with the rise in trophic level due to their accumulation in fat. Among the given animals, seagull which is a fish-eating bird and is present at a higher trophic level will have high levels of DDT deposition in its body.

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

Highest DDT deposition shall occur in

  1. Phytoplankton

  2. Sea Gull/Birds

  3. Crab

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

Dichlorodiphenyltrichloroethane (DDT) is chemically an organochlorine that was used an insecticide. It is a stable compound that shows high solubility in the fatty tissues. When it is released in the water via the agricultural field surface run-off, it is ingested by the aquatic organisms like phytoplankton that are main producers in an aquatic food chain. From these, DDT continues rising up the food chain. Because successive consumers at the successive trophic level consume more food, it accumulates at the higher trophic level in greater amounts. This is called biomagnification. Sea/gulls and birds are the top consumers in an aquatic food chain, they will show the highest accumulation.

Hence, the correct answer is 'Sea Gull/Birds'.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Blood platelets are found in

  1. Pisces

  2. Reptiles

  3. Birds

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

Blood platelets are found in mammals. Platelets, also called thrombocytes, are blood cells, whose function is to stop bleeding. Platelets have no nucleus: they are fragments of cytoplasm, which are derived from the megakaryocytes of the bone marrow, and then enter the circulation. These unactivated platelets are biconvex discoid structures.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Blood platelets are present in the blood of

  1. Fishes

  2. Amphibians

  3. Reptiles

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

The blood cells are of three major types they are erythrocytes(RBC), leucocytes(WBC) and platelets. Platelets or thrombocytes are cell fragments produced from megakaryocytes (special cells in the bone marrow).Blood normally contains 1,500,00 - 3,500,00 platelets mm – 3. Platelets can release a variety of substances most of which are involved in the coagulation or clotting of blood.  Blood platelets are present in the blood of Mammals.

So, the correct answer is 'Mammals'.

Multiple choice biology skeleton - movement and locomotion gait of animals basics of joints joints and type of joints skeleton, joints and muscles

A snail moves with the help of its

  1. Shell

  2. Wings

  3. Bristle

  4. Feet
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A snail uses its single long, muscular foot to crawl on a layer of mucus-like slime that it secretes. This mucus has unusual physical properties and scientists assumed that these sticky properties were essential for snail movement. 

Therefore, the correct answer is option D.

Multiple choice zoology aids to health immunity and the lines of immunity immune system of the body immunity and blood groups

Adaptive/acquired immunity in found in

  1. Vertebrates

  2. Invertebrates

  3. Plants

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

The adaptive immune system, also known as the acquired immune system is composed of highly specialized, systemic cells and processes that eliminate pathogens or prevent their growth. The acquired immune system is one of the two main immunity strategies found in vertebrates. Acquired immunity creates immunological memory after an initial response to a specific pathogen, and leads to an enhanced response to subsequent encounters with that pathogen.

So, the correct answer is 'Vertebrates'.

Multiple choice biology the living world: adaptations and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

Operculum is found in

  1. Lobster

  2. Fish

  3. Snake

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

Operculum is found in fishes.

It is especially found in bony fishes which protect their gills and also supports the facial structure.
Such structure is absent in snakes, lobsters and sponges.
So the correct answer is 'Operculum'.

Multiple choice biology biodiversity and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

Which one of the following is a matching set in animal classification?

  1. Liver fluke, tapeworm, roundworm, guinea worm

  2. Oyster, ship worm, octopus, cuttle fish

  3. Prawn, Nereis, crab, millipede

  4. Sea urchin, sea fan, sea lily, sea pen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Liver flukes and tapeworm are Platyhelminthes while roundworm and guinea worm are nematodes.
Prawn, millipede and crab are arthropods, while Nereis is an annelid.
Sea urchin and sea lily are echinoderms, while sea fan and sea pen are Cnidarians.
Oyster, ship worm, octopus, cuttle fish all belong to the phylum Mollusca.
Thus, the correct answer is option B.