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 evs snakes a snake charmer's story snakes and snake charmers uses of animals

Poisonous sea-snakes possess a

  1. Compressed tail

  2. Printed tail

  3. Depressed tail

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

  • Sea snakes are very poisonous. The beaked sea snake is the most poisonous sea snake. They have flattened or compressed paddle-like or oar-like tails.
  •  This is the distinguishing feature of sea snakes. They have laterally compressed bodies.  

Thus, the correct answer is 'Compressed tail.'

Multiple choice evs snakes a snake charmer's story snakes and snake charmers uses of animals

Which of the following is the ancestor of snake?

  1. Chameleon

  2. Lizard

  3. Crocodile

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Many evolutionary biologists believe that snakes evolved from lizard like ancestors. This has been established by comparing skulls of different lizards and snakes that have existed on earth and comparing body shapes. Also, few fossils of snakes having 4 legs like legs have been found indicating further common ancestry.
So, the correct option is 'Lizard'.
Multiple choice evs snakes a snake charmer's story snakes and snake charmers uses of animals

Which of the following snakes kills its prey by constriction?

  1. Banded bait

  2. Python

  3. Viper

  4. Rat snake
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The Pythonidae, commonly known simply as pythons, are a family of nonvenomous snakes found in Africa, Asia, and Australia. Among its members are some of the largest snakes in the world. Eight genera and 31 species are currently recognized. A constricting snake like python kills its prey by suffocation. It uses the momentum of its strike to throw coils around its victim’s body. Then, it squeezes. Every time the prey exhales, the snake squeezes a little more tightly. Soon, the victim can breathe no more.
So the correct option is 'python'.

Multiple choice biology animal world oviparous and viviparous number and shape of cells unicellular and multicellular organisms diversity and classification in animals adaptations in animals

Viviparity is found in

  1. Sharks

  2. Lizards

  3. Frogs

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

In viviparous animals, females give birth to young ones. The development of zygote takes place inside the female's body. Females deliver young ones and the chances of survival of offsprings are more. Mammals (except egg-laying mammals), like whale, shark, mouse, humans are examples of viviparous animals.

So, the correct answer is 'Sharks'.

Multiple choice biology water a precious resource sources of water and water cycle availability and forms of water the water cycle

Mullets, bhetki, pearl spots, prawns, mussels are the examples of 

  1. marine fish

  2. fresh water fish

  3. finned fish

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

Fresh water fisheries are found in ponds, tanks, rivers and various water bodies catla, rohu, mullets, and bhetki are some fresh water fisheries. They have important contribution to the growth of the economy of the country. There has been a very impressive growth in fish production during 1990's in the country.

Multiple choice evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

Fish which eradicates mosquito larvae is

  1. Rohu

  2. Anabas

  3. Clarius

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

The western mosquitofish (Gambusia affinis) is a species of freshwater fish, also known commonly as simply mosquitofish. Mosquitofish were introduced directly into ecosystems in many parts of the world as a biocontrol to lower mosquito populations, which in turn negatively affected many other species in each distinct bioregion. Based on diet, mosquitofish are classified as larvivorous fish. Their diet consists of zooplankton, small insects and insect larvae, and detritus material. Mosquitofish feed on mosquito larvae at all stages of life. Adult females can consume hundreds of mosquito larvae in one day.

Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

'Skate sucker' is the common name of 

  1. Hirudo

  2. Hirudinaria

  3. Pontobdella

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

Pontobdella is the type of leech. They are also known as skate sucker. It is the genus of leeches which includes bilaterally symmetrical animals. They belong to the class of Clitellata. It is marine leech. They are parasitic worms and attack skates and rays. They attach to the rock and wait to attack the skate. They also attack certain plaice. 

Thus, the correct answer is option C. 

Multiple choice biology environmental pollution control of water pollution protecting our environment rules are for everyone

Aquatic used which is popularly called terror of Bengal is

  1. Erythroxylum

  2. Eichhornia

  3. Echinus

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

Water hyacinth( Eichhornia crassipes) is known as the terror of bengal because it is an exotic shrub which strongly competes with the native species and has also eliminated many of them. It is a water-based plant that flourishes in the hot and humid climate of Bengal. Fish is a supplement food in Bengal. Water hyacinth is efficient in utilizing aquatic nutrients and solar energy for profuse biomass production and results in decline in number of fishes and because of the fish scarcity in Bengal caused by Eichhornia, the water hyacinth is also called "Terror of Bengal". 

So, the correct option is 'Option B' .

Multiple choice types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

Closed circulatory system is found in 

  1. Fishes

  2. Amphibians

  3. Birds

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

Vertebrates, and a few invertebrates, have a closed circulatory system. Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities. In fish, blood flows from the heart to the gills for gas exchange, then to the rest of the body, and finally back to the heart. This is called a single circulation since the blood flows through the heart only once during each complete trip around the body. Amphibians evolved a double circulation; blood flows from the heart to the gills or lungs for gas exchange, then back to the heart to be repressurized before flowing to the rest of the body. The vessels that serve the respiratory organs are called the branchial circuit (for gills) or pulmonary circuit (for lungs). Vessels that serve the rest of the body are called the systemic circuit. The amphibian heart and most reptilian hearts have only three chambers, two atria and one ventricle and there is some mixing of oxygen-rich and oxygen-poor blood in the single ventricle. Endothermic vertebrates, the birds and mammals, have higher metabolic rates and require stricter separation of the pulmonary and systemic blood. Thus, they have four-chambered hearts. Oxygen-rich blood flows through the other ventricle to the systemic circuit.

Multiple choice types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

Choose the correct answer from the alternatives given.
Which of the following has a closed type of circulatory system?

  1. Cockroach

  2. Fish

  3. Scorpion

  4. Mollusc
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • In an open circulatory system, the blood is pumped by the heart into the body cavity or the hemocoel. It is found in Arthropoda and Molluscs. Example: Cockroach, Scorpian.
  • In a closed circulatory system, the blood is circulated through blood vessels. It is found in vertebrates and annelids. Example: Fish.
So, the correct option is 'Fish'.
Multiple choice commercial applications environment in its totality alternatives for minimising depletion of natural resources components of environment effects and successes of environment conservation

 Upper part of sea/aquatic ecosystem contains _________.

  1. Plankton

  2. Nekton

  3. Plankton and nekton

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Planktons are passively floating in upper water, nektons are actively swimming while benthos lead sedentary life upon the sea bottom. 
  • Plankton (singular plankter) are a diverse group of organisms that live in the water column of large bodies of water and that cannot swim against a current.
  • They provide a crucial source of food to many large aquatic organisms, such as fish and whales.