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 botany know the plant world closely nutrition and its types types of nutrition in plants different modes of nutrition in plants

A rootless aquatic in which a portion of leaf is modified to form a bladder for catching small aquatic animals is?

  1. Dionaea

  2. Drosera

  3. Utricularia

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

Utricularia is also called as bladderwort because a part of the leaf is modified into a bladder like structure for catching small animals. It is a total root parasite because it is rootless and cannot prepare its own food.

Thus, the correct option is 'Utricularia'.

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 human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Whale washed ashore will die because of?

  1. Increase in body temperature

  2. Incapability to breathe

  3. Crushing of bones under body weight

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

Avails cannot try photo photo there are number of various reasons why they are unable to live on land first of all their bodies are not designed to hold the weight on the land which is unknown by and environment secondly they have a thick layer of blubber which is fatty tissue and lack of water well quickly overheat get dehydrated and try out the temperature of the water is essential for the survival correct option is increasing body temperature

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'.

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

Which among the following are known as false fishes?

  1. Pisces

  2. Cyclostomata

  3. Ostracodermi

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

Cyclostomata is a group of chordates that comprises the living jawless fishes - the lampreys and hagfishes. These fishes are a parasite as well as scavengers. The body is long, then tubular and tail is flat. They are also known as false fish.

So, the correct answer is option B.

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

Fish vertebrates are

  1. Ostractodermi

  2. Placodermi

  3. Cyclostomates

  4. Choanochthyes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A. Ostractodermi is the extinct class under the superclass Agnatha which are called jawless vertebrates.
B. Placodermi is an extinct class of armoured freshwater fishes which are known as fossils.
C. Cyclostomates are the round mouthed fishes. The class Cyclostomata comes under the superclass Agnatha.
Hence, fish veretbrates are Ostracodermi.
So, the correct answer is 'Ostracodermi'.
Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

An example of Agnatha (jawless vertebrate)/cyclostomata is

  1. Labeo rohita

  2. Scoliodon

  3. Rana tigrina

  4. Petromyzon
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A. Labeo rohita belongs to class Osteichthyes.
B. Scoliodon belongs to class Chondrichthyes.
C. Rana tigrina belongs to class Amphibia.
D. Petromyzon belongs to class Cyclostomata under superclass Agnatha (the Jawless vertebrates).
So, the correct answer is 'Petromyzon'.