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

Which of the following sets represents true fishes only?

  1. Dog fish, Gold fish, Saw fish, Tiger fish

  2. Devil fish, Jelly fish, Star fish, Cray fish

  3. Jelly fish, Star fish, Gold fish, Saw fish

  4. Saw fish, Tiger fish, Star fish, Cray fish

  5. Dog fish, Devil fish, Jelly fish, Tiger fish
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dog fish (Scoliodon), Gold fish (Carassius), Saw fish (Pristis), Tiger fish (Stegostoma): All are true fishes, i.e., members of class Pisces

Multiple choice

A study found a particular heavy metal contaminating a sea. The given illustration depicts organisms existing in the sea.

  1. Phytoplanktons
  2. Zooplanktons
  3. Labio
  4. Whale

Which flow chart correctly represents the arrangement of organisms in order of increasing concentration of heavy metals in their body?

  1. 1234

  2. 4321

  3. 2314

  4. 2143
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The concentration of heavy metals in the body of the organisms increases with the increase in trophic level. Since phytoplanktons are present at the lower most trophic level, the concentration of heavy metals in phytoplanktons will be minimum while the concentration of heavy metals in the Whale will be highest as it is present at a higher trophic level. Hence, the correct order of organisms with increasing levels of heavy metals is

  1. Phytoplankton < 2. Zooplankton < 3.  Labio < 4. Whale
Multiple choice

Directions: Choose the most appropriate word to fill the (ii) blank.

The white shark is at the top of the (i) _____ food chain. The (ii) ___ system is different from that of other sharks. Its (iii) __ temperature is about three to five degrees Celsius above water temperature. This speeds up its (iv) _____ and adds to its strength and endurance.

  1. blood

  2. digestion

  3. marine

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

The blank (ii) refers to 'The _____ system' of the white shark. Among the options, 'circulatory' is the only system that fits the context - the passage then discusses body temperature and its effects on digestion and metabolism. The circulatory system is responsible for heat distribution in the body, which connects to the temperature discussion.

Multiple choice

Directions: Choose the most appropriate word to fill the (iv) blank.

The white shark is at the top of the (i) _____ food chain. The (ii) ___ system is different from that of other sharks. Its (iii) __ temperature is about three to five degrees Celsius above water temperature. This speeds up its (iv) _____ and adds to its strength and endurance.

  1. digestion

  2. circulatory

  3. blood

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

The sentence states that the shark's body temperature being above water temperature 'speeds up its _____'. 'Digestion' is the correct answer because metabolic processes (including digestion) are accelerated by higher body temperatures. This increased metabolic rate contributes to the shark's strength and endurance as mentioned.

Multiple choice

Directions: Choose the most appropriate word to fill the (iii) blank.

The white shark is at the top of the (i) _____ food chain. The (ii) ___ system is different from that of other sharks. Its (iii) __ temperature is about three to five degrees Celsius above water temperature. This speeds up its (iv) _____ and adds to its strength and endurance.

  1. circulatory

  2. marine

  3. digestion

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

Blank (iii) asks about 'Its _____ temperature'. 'Blood' is the correct answer because blood temperature is a direct measure of body temperature. The passage discusses how the shark's blood/body temperature is 3-5 degrees Celsius above water temperature. 'Circulatory' and 'marine' don't grammatically fit '_____ temperature' in this context.

Multiple choice

Directions: Choose the most appropriate word to fill the (i) blank.

The white shark is at the top of the (i) _____ food chain. The (ii) ___ system is different from that of other sharks. Its (iii) __ temperature is about three to five degrees Celsius above water temperature. This speeds up its (iv) _____ and adds to its strength and endurance.

  1. marine

  2. circulatory

  3. blood

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

 The white shark is at the top of the marine food chain.

Multiple choice

Which algae is involved in ciguatera food poisoning?

  1. Gambierdiscus toxicus

  2. Gymnodinium

  3. Gonyaulax

  4. Phaeophyta

  5. Diatoms
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It results from eating marine fishes that have consumed the dinoflagellate gambierdiscus toxicus. The algal toxin called ciguatoxin accumulates in the flesh of fish. This is one of the most powerful toxins known and remains in the flesh even after it has been cooked.

Multiple choice

Corals can be best described as

  1. the most poor fauna

  2. the most rich fauna

  3. fresh water fauna

  4. free living ctenophorans
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Corals provide ideal habitat for various animals. Therefore, it is considered as the richest marine biome.