Rohu and catla are types of I. Freshwater fish II. Marine water fish III. Both I and II IV. None of these
Some organisms are solely dependent on water for food, shelter reproduction and other life processes. They are known as aquatic organisms. Aquatic ecosystem consists of groups of organisms which are dependent on one another and water for food and shelter. These organisms have certain adaptations to help them survive in water. For example limbs are modified into fins. Gills are present for respiration, streamlined body for swimming. Gills help them breathe in the dissolved oxygen. Types of aquatic ecosystem Freshwater- Lakes, ponds, rivers, streams, swamps, wetland, pools came under the freshwater ecosystem. Several fishes like rohu, catla, frogs, shrimps, etc are found in such habitat. Marine- Marine refers to salt water. It occupies the largest surface area on earth. Sea, oceans come under marine habitat. Organisms like whales, fishes, reptiles stay in this type of habitat. Brackish water-It is more saline than freshwater but less saline than seawater. The correct answer is (A) Catla and rohu are the examples of Freshwater fish.
