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 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.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Which has no skeleton?

  1. Cockroach

  2. Mosquito

  3. Butterfly

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

Jellyfish are the major non-polyp form of the individuals of the phylum Cnidaria. They are free-swimming marine animals consisting of a gelatinous umbrella-shaped bell and trailing tentacles. They do not possess a proper skeleton.
Therefore, the correct answer is option D.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Select the wrongly paired one from the following.

  1. Flats worms - Tape worm and liver fluke

  2. Sea walnuts - Hydra and Obelia

  3. Homoiothermous - Aves and mammals

  4. Incomplete digestive system - Platyhelminthes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

a) Tape worm and liver fluke belongs to phylum platyhelminthes, having dorsoventrally flattened body hence are flat worms.

b) Hydra and Obelia are cnidarians belongs to phylum coelenterata and exhibit two basic body forms i.e, polyp and medusa. Sea walnuts belongs to phylum ctenophora and bears comb plates.
c) Homiothermous are warm blooded animals which maintains a constant body temperature and includes aves and mammals.
d) Platyhelminthes have incomplete digestive system as they absorb nutrients from the host directly through their body surface.
So, the correct answer is option B.

Multiple choice biology interdependence in living beings - plants and animals animals as consumers scavengers and decomposers interdependence between plants and animals

Most animals that live in deep oceanic water are 

  1. Primary consumers

  2. Secondary consumers

  3. Tertiary consumers

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

Most animals that live in deep oceanic water are detritivores. They are also called as scavengers. Most of them living in deep ocean include crustaceans and polychaetes.

Thus, the correct answer is option D.

Multiple choice

What class of animal is a newt?

  1. reptile

  2. amphibian

  3. crustacean

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

A newt is a type of salamander, which belongs to the class of animals known as amphibians.

Multiple choice

Mammal is to lungs as fish is to ________

  1. scales

  2. fins

  3. gills

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

Mammals use lungs to breathe air, while fish use gills to extract oxygen from water. This is a standard biological analogy.

Multiple choice

Which of the following is a reptile?

  1. sea horse

  2. toad

  3. gecko

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

A gecko is a reptile, which is a cold-blooded vertebrate with scaly skin. Sea horses are fish, toads are amphibians, and crabs are crustaceans.