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 biology habits and habitats of some important animals behavioural science ethology animal behaviour

The caudal fin of fish and pigeon is useful to ____________.

  1. increase the velocity.

  2. decrease the velocity.

  3. change direction.

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

The caudal fin of a fish acts as a rudder and propulsion tool, while the tail feathers of a pigeon act similarly during flight to change direction. Both structures are primarily adapted for steering rather than maintaining forward velocity or basic balance alone.

Multiple choice biology habits and habitats of some important animals behavioural science ethology animal behaviour

How many animal in the list given which is ammoniotelic in nature?
Aquatic insect, fresh water bony fish, frog, birds, reptiles, spider, marine bony fish, crocodile.

  1. One

  2. Two

  3. Three

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

Ammoniotelic animals excrete nitrogenous waste primarily as ammonia. Among the list, only aquatic insects (some) or specific fish fit, but typically, only one group is considered strictly ammoniotelic in this context.

Multiple choice botany types and parts of plants plant life cycle alternation of generations life span

Which of the following organisms breeds only once in life time

  1. Bamboo

  2. Oysters

  3. Pelagic fishes

  4. Birds

  5. Mammals
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Bamboo flower only once in their life, generally after 50 - 100 years. They produce a large number of fruits and die. They rely on seed to perpetuate themselves. 
Oysters usually reach maturity in one year. 
Birds mate only once per year.
Mammals breeding cycle comes once a month.
Pelagic fishes is a seasonal breeder.
So, the correct answer is option A.
Multiple choice biology the life cycle of animals types of reproduction in animals oviparous and viviparous a study on animals

Cleidoic egg is an adaptation for

  1. Aquatic life

  2. Marine life

  3. Terrestrial life

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

Cleidoic eggs are laid by terrestrial animals like reptiles and birds. The egg is surrounded by a hard porous shell. Gaseous diffusion occurs through porous shell. Egg of aquatic animals is covered by a jelly coat and not by a hard shell. The shell in cleidoic eggs protects the developing embryo and also makes available an aquatic environment for development. The yolk of an egg is a source of nutrition for developing an embryo.

So, the correct answer is option C.

Multiple choice biology the life cycle of animals types of reproduction in animals oviparous and viviparous a study on animals

Reptile and bird eggs are

  1. Macrolecithal

  2. Oligolecithal

  3. Mesolecithal

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

Reptiles and birds are terrestrial animals. They lay large yolk-rich eggs which are covered with a porous shell. As the eggs are rich in yolk they can support the development of an embryo. Hence, embryogenesis occurs outside the body of the animal inside the egg. Such yolk-rich eggs are called as macrolecithal eggs.

So, the correct answer is option A.

Multiple choice biology the life cycle of animals types of reproduction in animals oviparous and viviparous a study on animals

Animals which give birth to young ones are called as

  1. Amphibious

  2. Oviparous

  3. Triploblastic

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

Amphibious are the animals that can live on water as well as on land.
Oviparous are the animals that lay eggs.
Triploblastic describes the animal having a body composed of three embryonic cell layers as the ectoderm, mesoderm, and endoderm.
Viviparous are animals that give birth to live young one that has developed inside the body of the parent.

So, the correct answer is option D.

Multiple choice biology the life cycle of animals types of reproduction in animals oviparous and viviparous a study on animals

The eggs of frogs do not have shells for protection, yet they are safe in water. How?

  1. They are covered and embedded in a jelly like strip

  2. They are covered with bark

  3. They are covered with yolk

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

  • The female frog covers the eggs with a jelly-like substance that causes the eggs to float to the water's surface and also protects from any damage.

So, the correct answer is option A.

Multiple choice biology the life cycle of animals types of reproduction in animals oviparous and viviparous a study on animals

Those who give birth to young-ones are called viviparous. Some flabes lay eggs. Therefore,

  1. Some frogs do lay eggs

  2. Some frogs are fishes

  3. Some fishes do not lay eggs

  4. Some fishes are oviparous
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Giving birth to live young is called vivipary. When a species lay eggs it is called oviparity.

So, the correct option is 'Some fishes do not lay eggs'.

Multiple choice zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Natural reservoir of phosphorus is :

  1. Sea water

  2. Animal bones

  3. Rock

  4. Fossils
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The natural reservoir of phosphate is the rock which contains phosphorus in the form of phosphates when rocks are weathered, minute amounts of these phosphate dissolve in soil solution and are absorbed by the roots of the plants. Herbivores and other animals obtain this element from plants.

So, the correct answer is 'Rock'.
Multiple choice zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Natural reservoir of phosphorus is 

  1. Animal bones

  2. Rock

  3. Fossils

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

Sedimentary rocks are the largest reservoir of the phosphorous .Phosphates are removed from the rocks (via weathering) and are distributed throughout both soils and water. Plants take up the phosphate ions from the soil. The phosphates then move from plants to animals when herbivores eat plants and carnivores eat plants or herbivores. The phosphates absorbed by animal tissue through consumption eventually returns to the soil through the excretion of urine and feces, as well as from the final decomposition of plants and animals after death. Hence option B is correct.

Multiple choice botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

Non-cleiodic eggs occurs in

  1. Bird

  2. Fish

  3. Reptile

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

Cleidoic eggs are those eggs, which have a protective shell, and are laid out of water. The shell is porous to air and may be flexible or calcareous (hard). The eggs contain all the food the embryo needs to develop into a hatchling. The significance of the cleidoic egg is that it enables reproduction out of and often away from water. The eggs of insects and birds, which is enclosed in a protective shell limiting the exchange of water, gases, etc. These type of eggs are found in reptiles, birds and monotremes. Therefore, non-cleidoic eggs will be found in fishes. Hence, option B is correct.

Multiple choice biology food and it's constituents functions and principal sources of lipids chemical organization in living beings lipids

Among the following edible fishes which one is a marine fish having rich source of omega-3 fatty acids

  1. Mackerel

  2. Mystus

  3. Magur

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

The most widely available dietary source of omega-3 fats is oily fish, such as salmon, herring, mackerel, anchovies, menhaden, and sardines. All types of mackerel are higher-fat fish, rich in the healthful polyunsaturated fats known as long-chain omega-3s, which may help boost heart health. So, the correct answer is option A.