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 is the largest starfish?

  1. Pycnopodia helianthoides

  2. Linckia laevigata

  3. Asterias rubens

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

Pycnopodia helianthoides, commonly known as the sunflower sea star, is widely recognized as one of the largest starfish species in the world.

Multiple choice

Corals are

  1. Plants

  2. Animals

  3. Rocks

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

Corals are marine invertebrates that live in compact colonies. They are animals, not plants or rocks.

Multiple choice

The fish used for biological control of malaria is

  1. Gambusia

  2. Labeo rohita

  3. Gold fish

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

 Gambusia are also known as mosquitofish, which, however, refers more specifically to two species, G. affinis and G. holbrooki. These can be introduced into ponds to eat mosquito larvae and used for biological control of malaria.

Multiple choice

Presence of gills in the tadpoles of frogs indicates that

  1. fishes have evolved from frog like ancestors

  2. frogs will have gills in the future

  3. frogs have evolved from gilled ancestors

  4. fishes were amphibians in the past

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Presence of gills in the tadpoles suggest that frogs or amphibians were evolved from fishes. Metamorphosis in tadpoles changed a tadpole to frog during which gills got lost.