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 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 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.

Multiple choice zoology living and non living characteristics of life attributes of living organisms signs of life biology : an introduction living world and classification

Multiple Choice Questions
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

A few plants exhibits unusual flowering phenomenon. Bamboo species is one of them, which produces flower once in their life time, generally after 50-100 years. They produce large number of fruits and die

So, the correct option is 'Bamboo'

Multiple choice biology adaptation plant adaptation adaptation in plants plant habitat

All the following statements are correct except:

  1. Our National aquatic animal is Platanista( Indian Dolphin) found in Indus, Ganges and Brahmaputra rivers

  2. Chaetopleura is commonly known as chiton

  3. Electric organs are found in Trygon

  4. In birds endoskeleton is fully ossified
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

Eggs of which one of these can develop parthenogenetically by chemicals?

  1. Man

  2. Frog

  3. Sea urchin

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

Artificial parthenogenesis can be induced in eggs of both frog and sea urchin but chemical (hypertonic sea water) induction occurs in sea urchin, whereas, frog eggs when pricked with a needle can undergo parthenogenesis. Thus, the correct answer is option C.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Which one of the following pairs of animals are jaw-less fishes?

  1. Lampreys and hag fishes

  2. Guppies and hag fishes

  3. Lampreys and eels

  4. Mackerels and rohu
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The class Agnatha consists of a group of animals, that lack jaws and paired fins. There are two living groups of Agnatha, the lampreys, and the hagfish. 

So, the correct answer is option A.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Petromyzon cannot be called as fish, as

  1. It lacks median fins

  2. It lacks paired fins

  3. It lacks an operculum

  4. It has acicular mouth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Petromyzon is the scientific name of the sea lamprey. It is long and slender snake like organism. This organism is not called as the true fish. The organism lacks the paired fins. The organism have well developed dorsal and ventral finfolds. This finfolds helps in swimming and locomotion. 
Thus, the correct answer is option B.
Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

True fish possess gills and fins. Which one of the following is not a true fish?

  1. Carassius

  2. Hythalamincthyes

  3. Hippocampus

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

Carassius is a genus in the ray-finned fish family Cyprinidae.
Hippocampus is the name of marine fishes in the genus Hippocampus.
While Lepisma is a genus of primitive insects.
So, the correct answer is option D.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Which of the following is a jawless fish?

  1. Hippocampus

  2. Torpedo

  3. Petromyzon

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

The hippocampus is the name of marine fishes.
Torpedo is the group of flattened cartilaginous fishes, also called an electric ray.
Mystus is a genus of small to medium-sized bagrid catfishes.
Petromyzon is the 'sea lamprey', which is parasitic lamprey. It is a 'jawless' fish.

So, the correct answer is option C.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Petromyzon and Myxine are not regarded as true fishes, because

  1. They lack unpaired fins

  2. They have circular mouth

  3. In them operculum is absent

  4. There is absence of paired fins and jaws
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Myxine is a genus of hagfish, which are eel-shaped, slime-producing marine fish. 
Petromyzon is a parasitic lamprey found in the northern Atlantic ocean along shores of Antartica and North America, in the western Mediterranean sea and in the shores of the Great lakes. It is brown, gray, or black on its back and white or gray on the underside and can grow up to 90 cm long. 

These animals are the only living representatives of ancient creatures. They also lack jaws.
So, the correct answer is option D.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Which of the following is a circular mouthed fish?

  1. Myxine

  2. Torpedo

  3. Trygon

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

  • Cyclostomata is a group of jawless living fishes which belong to the superclass Agnatha.
  • Eg- the lampreys and hagfishes.
  • The name Cyclostomata means circular mouths.
A. Myxine is a genus of hagfish.
B. Torpedo is a flattened cartilaginous fish which is also known as electric fish.
C. Trygon is a cartilaginous fish which is also known as stingfish.
D, Scoliodon is cartilaginous fish which is also known as dogfish.
  • All the cartilaginous fishes belong to Gnathostomata i.e they have jaws.
  • So, the correct answer is 'Myxine'.