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 animal diversity - ii (phylum: chordata) amphibia and reptilia amphibia classifications of chordata

Which of the following is not a true amphibian?

  1. Tortoise

  2. Frog

  3. Salamander

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

Tortoises are considered as reptiles and not amphibians because of the following characteristics:

  • They are vertebrates that is they have a backbone.
  • They are covered in scales.
  • They breathe through lungs.
  • They lay eggs.
  • And they are cold blooded which means they cannot regulate their body temperature.
And all these characteristics are shown by the organisms which fall under the category of reptiles and not amphibians. 

Multiple choice zoology animal diversity - ii (phylum: chordata) amphibia and reptilia amphibia classifications of chordata

Which of the following statement is true for Ichthyophis?

  1. It is limbless reptile, who lives in water

  2. It is limbless amphibian, who lives in water

  3. It is limbed, lives on land

  4. It is limbless animal and amphibious in nature
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Ichthyophis is a genus of caecilians (a group of limbless, serpentine amphibians).
  • They are found in moisturized or wet tropical habitats.
  • So, the correct answer is 'It is a limbless amphibian, who lives in water'.
Multiple choice zoology animal diversity - ii (phylum: chordata) amphibia and reptilia amphibia classifications of chordata

An aquatic animal that lays eggs only on land is

  1. Fish

  2. Frog

  3. Sharks

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

Turtles are characterized by a special bony or cartilaginous shell developed from their ribs and acting as a shield. Before the turtle lay their eggs, nearly all turtles prepare a nest on land. During the last weeks of gestation, the pregnant female spends less time in the water and more time on land, smelling and scratching at the ground in search of the perfect place to lay her eggs.

So, the correct answer is 'Turtles'.

Multiple choice evs i love gujarat flora and fauna in forest ecosystem threatened species need of conservation

Fauna that lives in ice is called as 

  1. Megafauna

  2. Microfauna

  3. Cryofauna

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

The animal life which is found in a particular region at a particular period of time is known as fauna. This includes the various different types of animals found in that area. On the basis of the habitats, size and the environments in which the animals are found, the animals are classified into various different types of fauna as megafauna, cryofauna, microfauna, etc. The animals or the organisms which can live in or close to ice are known as the cryofauna. 

Thus, the correct answer is option C. 

Multiple choice biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

Many freshwater organisms cannot live for long in seawater because the surrounding water will be ______ to body cells and ______ may occur.

  1. Hyper tonic, Exosmosis

  2. Hyper tonic, Endosmosis

  3. Hypo tonic, Exosmosis

  4. Hypo tonic, Endosmosis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the sea water , the surrounding water is salty and hence hypertonic to the body cells, Thus, water will move from its higher concentration to ts lower concentration leading to exosmosis. Therefore, many fresh-water animals cannot live for long in sea water and vice versa. 

Multiple choice evs insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

The concentration of polychlorinated biphenyls (PCB, an organochloride contaminant) in many fish populations has been declining, since a ban on their production was instituted in the late 1970s. PCBs remain a potential problem, however, because they are lipophilic and are known to biomagnify. Based on this knowledge, 

What type of fish expected to be safest for human consumption?

  1. Piscivorous fish species (i.e., which eat other fish)

  2. Benthivorous fish species (i.e., which eat invertebrates on the lake bottom)

  3. Small (young) fish

  4. Fish species with high fat content
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heavy metals and persistent pesticides (e.g., organochlorine of chlorinated hydrocabons like DDT) pass into food chain and increase in amount per unit weight of organisms with the rise in trophic level due to their accumulation in fat, This phenomenon is called biomagnification. Therefore, lower the trophic level of fish (such as small fish), lesser will be the biomagnification and hence safer it will be for consumption.

Multiple choice evs sources of water the lithosphere and the hydrosphere first aid safety and first aid

Which one of the following fish is being illegally introduced for aquaculture purposes and is posing a threat to the indigenous catfishes of Indian rivers?

  1. Clarias gariepinus

  2. Nile perch

  3. Climbing perch

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

Clarias gariepinus, the African catfish has been illegally introduced for aquaculture purposes and is posing a threat to the indigenous catfishes of Indian rivers.

Multiple choice zoology our health harmful microorganism for humans microbes and diseases categories of diseases

Toxins (saxitoxins) secreted by some dinoflagellates enter the body of human beings through food chain and result in

  1. Madness

  2. Paralysis

  3. Syphilis

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

Genus Alexandreum of dinoflagellates secretes neurotoxin saxitoxins which are the causative agents of paralytic shellfish poisoning (PSP). Molluscs such as mussels and clams feed on a large number of dinoflagellates, human consumption of those molluscs causes paralysis. 

Madness is a characteristic symptom of rabies which is caused by RNA virus “rabies virus” and is mostly spread through the bite of an infected dog. 
Syphilis is a sexually transmitted disease, caused by gram negative spirochete, Treponema pallidum. 
Plague is caused by gram negative rod shaped bacteria. Yersinia pestis and is characterised by flu-like symptoms. It is transmitted by bites from infected fleas. So, the correct answer is option B.

Multiple choice

Which of the following is a common type of fish auction used in the agricultural fisheries market?

  1. English auction

  2. Dutch auction

  3. Sealed-bid auction

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

English auction, Dutch auction, and sealed-bid auction are common types of fish auctions used in the agricultural fisheries market.

Multiple choice

Which of the following is a type of fish that is commonly found in estuaries?

  1. Flounder

  2. Salmon

  3. Trout

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

Flounder is a type of fish that is commonly found in estuaries.

Multiple choice

Which of the following is a type of bird that is commonly found in estuaries?

  1. Osprey

  2. Eagle

  3. Hawk

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

Osprey is a type of bird that is commonly found in estuaries.

Multiple choice

What is the name of the unique type of fishing practiced in the backwaters of Kerala, where fishermen use Chinese fishing nets?

  1. Cast Net Fishing

  2. Trawling

  3. Gill Net Fishing

  4. Chinese Fishing Nets
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chinese Fishing Nets are a unique type of fishing practiced in the backwaters of Kerala, particularly in the Kochi region. These large, fixed nets are operated by skilled fishermen using a counterweight system, creating a visually striking and efficient method of fishing.

Multiple choice

Which of these species is not considered to be a keystone species?

  1. Sea Otter

  2. African Elephant

  3. Coral Reefs

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

The Honeybee is not considered to be a keystone species, although it plays an important role in pollination.

Multiple choice

Which of these species is known for its long lifespan and slow reproductive rate?

  1. Giant Tortoise

  2. Greenland Shark

  3. Immortal Jellyfish

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

The Greenland Shark is known for its long lifespan, estimated to be over 400 years, and its slow reproductive rate, with females reaching sexual maturity at around 150 years of age.

Multiple choice

Which of the following is NOT a common type of marine life often encountered during scuba diving?

  1. Coral reefs.

  2. Fish.

  3. Sea turtles.

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

Land animals are not typically encountered during scuba diving as they do not live in marine environments.