2. Why can't fish live for longer time in an aquarium containing only water?
3. How does a fish respire? Why does it die when it is taken out of water?
4. What is the main function of the large hump on the back of a camel ?
5. Why is the camel known as the 'Ship of the Desert'?
6. What kind of leaves do desert plants have?
ii
7. How does the skin of an animal help it to adapt to its habitat?
8. State a few differences between aquatic animals and land animals.
Answers
2) Fishes are aquatic animals. They do not have lungs but they have gills which help in their respiration under water. ... These gill filaments absorb oxygen from the water and move it into the bloodstream. In the absence of water, they are not able to respire and ultimately die within a short period of time.
3) Gills are filled with blood capillaries and are able to absorb oxygen dissolved in water. ... - When fishes are taken out of the water, the supply of oxygen to the fish is reduced as they cannot respire using the oxygen present in the atmosphere. Thus, they will die when taken out of water.
4)The humps function the same way—storing fat which can be converted to water and energy when sustenance is not available. These humps give camels their legendary ability to endure long periods of travel without water, even in harsh desert conditions. As their fat is depleted, the humps become floppy and flabby.
5) Camels are called ships of the desert because they carry very big loads from one side of the desert to the other. Dromedary camels can carry over two hundred kilograms on their backs. Camels walk four kilometers per hour through the hot desert. ... Camels do need water, but they save it for long trips.
6)Little leaves — Most desert plants have small leaves, spikes for leaves, or no leaves at all. The smaller or fewer leaves a plant has, the less water is lost during transpiration since it has less surface area open to the sun and wind.
7)An animal's body covering is one clearly visible adaptation. Body coverings help to protect animals in diverse environments -- from the land to water, from the arctic to the desert. Mammals have hair, or fur, that helps insulate their bodies.
8)Aquatic animals can be found in water habitats, which can be either fresh or marine. Terrestrial animals can be found exclusively in the land. Aquatic animals respire through gills or their skin. In contrast, terrestrial animals respire through lungs or trachea.