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 selection and evolution extinction extinctions environmental science

Which of the following fish led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in the take Victoria of E. Africa?

  1. Catla catla

  2. Dog fish

  3. Nile perch

  4. African catfish
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Nile perch, (species Lates niloticus), large food and game fish of the family Centropomidae (order Perciformes), found in the Nile and other rivers and lakes of Africa. A large-mouthed fish, the Nile perch is greenish or brownish above and silvery below and grows to about 1.8 m (6 feet) and 140 kg (300 pounds). It has an elongated body, a protruding lower jaw, a rounded tail, and two dorsal fins. In 1954, L. niloticus was introduced into Lake Victoria in Africa, home to hundreds of cichlid fishes. A powerful predator, the Nile perch has greatly reduced the cichlid numbers.
So the correct option is 'nile perch'.
Multiple choice biology life processes in living organisms- part 2 earthworm - reproductive system reproduction in earthworm introduction to reproduction

Fertilization is internal in 

  1. Toads

  2. Frogs

  3. Dogfish

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

Fertilization can be internal or external. When the fertilization occurs inside the female body, then it is internal fertilization (e.g., most reptiles, some birds, some fishes.)
Fertilization in dogfish, shark is internal. While in catfish, toads and some frogs, it is external fertilization.
Hence, the correct answer is option (C).

Multiple choice zoology animal diversity - ii (phylum: chordata) circulatory system in frog frog - digestive system, circulatory system, excretory system and reproductive system frog

Ureotelic vertebrates are?

  1. Fish

  2. Reptiles and cartilaginous fish

  3. Bony fish and mammals

  4. Amphibians; mammals, cartilaginous fish
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The excretion of urea is called ureotelism. Land animals, mainly amphibians mammals, convert ammonia into urea. These animals are called ureotelic. Urea is a less toxic compound than ammonia. Eg marine fishes, many amphibians etc.


So the correct option is "amphibian, mammals, cartilaginous fish".

Multiple choice evs wonderful world of bholu aquatic habitat life inside water animal and habitat

Animals that live in both land and water condition is called as

  1. Terrestrial

  2. Aquatic

  3. Amphibious

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Amphibians spend their lives in water and on land. There are more than 4,000 different kinds of amphibians. Members of this animal class are frogs, toads, salamanders, newts, and caecilians or blindworms.
Before amphibians reach adulthood, they first experience a larval stage, where they breathe primarily through their gills. When they get older, they start to breathe through their lungs, which allows them to live on land. Hence, it is necessary for amphibians to live in both land and water.
So, the correct answer is Amphibious.
Multiple choice evs wonderful world of bholu aquatic habitat life inside water animal and habitat

Identify the odd one.

  1. Deer, fish, and salamander

  2. Deer, bear, cow, and elephant

  3. Prawns, whales, and shark,

  4. Frog, salamander, and toad,
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Option A is the odd one because it mixes terrestrial (deer) with aquatic/amphibious animals, whereas the other options group animals by habitat or class (e.g., mammals, amphibians).

Multiple choice evs life inside water aquatic habitat animal and habitat wonderful world of bholu

Which of the following is not a correct match of animal and its habitat?

  1. Hydra vulgaris - Sea water

  2. Hydra gangetic - Fresh water

  3. Obelia - Sea water

  4. Physalia - Sea water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydra vulgaris - is freshwater hydra, Hydra gangetic - Fresh water hydra, Obeila - sea water, Physalia - sea water. 

Therefore, the correct answer is (A).

Multiple choice biology respiration in organism breathing underwater respiration in other organisms respiration in living organisms

Gills in fish are projection of

  1. Skin

  2. Fins

  3. Norstrils

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

Fish and some amphibians respire primarily with gills. Gills are projection of the skin. Gills are comprised of highly vascular structures, with their outer surfaces thrown into thin folds or narrow filaments to increase the surface area for the exchange of oxygen between the water and the blood. These gill structures develop entirely from the pharyngeal arch complex. Blood is supplied through the aortic arches that pass through each pharyngeal arch. The aortic arches branch to form the afferent branchial arteries and the capillary network in the gills. Oxygenated blood comes from the gills through efferent branchial arteries which supply the dorsal aorta, the vessel which is the primary supply of oxygenated blood to the body. Gills are not the projections of fins, alimentary canal and nostrils in fish. Thus, option A is correct.

Multiple choice biology respiration in living organisms breathing underwater respiration in other organisms respiration in organism

Which of the following animals breathe through their skin and lungs?

  1. Earthworm

  2. Frog

  3. Fish

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Although frogs have lungs, they perform much of their respiration through their skin, bypassing their lungs completely. Their moist skin is specially designed with tiny blood vessels near the surface to help diffuse oxygen in and carbon dioxide out, even when the frogs are hibernating or underwater. When a frog breathes through his skin, it's called as cutaneous gas exchange. This means he's exchanging oxygen for carbon dioxide, similar to the way your lungs exchange the gases. The gases pass through the skin by diffusion. Frog breathes through lungs when on land. Fish and earthworms can not breath through lungs as they dont have. 

Thus, option B is correct.