7th Class Science Respiration In Plants And Animals Respiration in Animals

Respiration in Animals

Category : 7th Class

*     Respiration in Animals


In respiration, oxidation of food inside the cell in almost all animals and plants are somewhat similar. But the transportation of respiratory gasses (\[{{O}_{2}}\]and\[C{{O}_{2}}\]), essential for respiration inside the cell and outside the cell, is different in different animals, as different animals live in different type of habitat. Therefore different animals have evolved different body shapes according to the environment they live in and to transport respiratory gasses from the environment. For example, earthworm lives in soil. So it has developed moist skin for the exchange of respiratory gasses. Fishes live in water and have to absorb oxygen dissolved in water. So they have developed gills for respiratory purpose. Land animals like human, dog, lion etc. have developed different respiratory system as they live on land. Hence, we see that different types of respiratory system have been evolved in different animals to suit their specific environment and for continuation of their life.



*             Respiration and Photosynthesis

In photosynthesis, carbon dioxide and water is combined in the presence of sunlight to form glucose and oxygen .Whereas in respiration, glucose and oxygen is combined to form water and carbon dioxide. Input of energy from sunlight during photosynthesis is obtained in form of ATP molecules, during respiration. Living body cannot utilize sunlight directly. Therefore sunlight is required to be converted into simple form of energy so that it can be used by our body. In this whole process carbon, hydrogen and oxygen atoms act as a catalyst. They do not change; only their molecular arrangement is changed and sunlight is converted into simple form of energy.


To be alive, protection and energy are the first and basic requirement. And preparation of food is the first stage in the way of obtaining energy. It is the carbon, hydrogen and oxygen that make us enable to utilize the sunlight to get energy. Therefore these elements play very important role in sustaining life on the Earth. Without them we cease to exist.





       Which one of the following respiratory organs can receive oxygen dissolved in water?

(a) Lung

(b) Skin

(c) Gills

(d) Root hair

(e) None of these


Answer: (c)



     In which one of the following systems the lungs belong to?

(a) Digestive system

(b) Respiratory system

(c) Nervous system

(d) Excretory system

(e) None of these


Answer: (b)




Breathing consists of only two processes, i.e. inhaling of air and exhaling of air. Respiration consists of both breathing and oxidation of food. Therefore breathing is just a part of respiration.

Raw materials for respiration are digested food (glucose) and oxygen; and the products are carbon dioxide and water.

 Oxidation of food occurs inside the cell.

Plants andanimals both perform respiration.

The way of transporting respiratory gasses in plants and animals is different Animals have a transport system for respiration; whereas each parts of plants get air from atmosphere individually?

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