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प्रश्न
State the three common features of all the respiratory organs like skin, gills and lungs.
उत्तर
All the respiratory organs like skin, gills and lungs have three common features.
(a) They have a large surface area to get enough oxygen.
(b) They have thin walls for easy diffusion and exchange of respiratory gases.
(c) They have a rich blood supply for transporting respiratory gases.
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संबंधित प्रश्न
Carbon dioxide enters into the leaves through tiny pores present on the surface of the leaf called _________.
(a) chlorophyll
(b) chloroplast
(c) stomata
(d) epidermis
Which part of roots is involved in the exchange of respiratory gases?
Out of photosynthesis and respiration in plants, which process occurs:
(a) all the time?
(b) only at daytime?
Where does the blood absorb oxygen in the human body?
In the lungs what substance is taken into the body?
State whether the following statement is true or false:
Fish and earthworm exchange gases during respiration in the same way.
From where do the aquatic animals and terrestrial animals obtain oxygen for breathing and respiration?
Explain how, it would benefit deep sea divers if humans also had gills.
Explain how, the air we breathe in gets cleaned while passing through the nasal passage.
Why is diffusion insufficient to meet the oxygen requirements of large multicellular organisms like humans?
Some sugar solution is taken in a test-tube and a little of substance X in powder form is added to it. The mouth of test-tube is closed with a cork and allowed to stand for sometime. On opening the cork, a characteristic smell of substance Y is obtained and a gas Z is also observed to be formed. The gas Z extinguishes a burning matchstick.
(a) What could be (i) X, (ii) Y, and (iii) Z?
(b) What is the process of converting sugar into substance Y by the action of X known as?
(c) What type of respiration is exhibited by X in the above process?
An organism X having breathing organs A lives on land. When organism X goes underwater, it cannot survive for a long time unless carrying an oxygen cylinder. On the other hand, the organism Y having breathing organs B always lives in water and if taken out of the water, it dies after a short while. A third organism Z having breathing organs C and D which lives on the banks of ponds, lakes, and rivers can survive on land as well as in water equally well.
(a) What could organism X be? Name the breathing organs A.
(b) What could organism Y be? Name the breathing organs B.
(c) What could organism Z be? Name the breathing organs C and D.
(d) Out of X, Y, and Z, which organism is (i) amphibian, (ii) aquatic, and (iii)
terrestrial?
Name the body structure concerned with the given functional activity:
Combines with the oxygen in the lungs.
State one function of the following:
Diaphragm
Give suitable explanation for the following :
Why does a person feel breathlessness at higher altitudes?
______ refers to the physical process by which gaseous exchange takes place between the atmosphere and the lungs.
____________ is necessary for the respiration in plant.
Visit a local doctor. Learn about the harmful effects of smoking. You can also collect material on this topic from other sources. You can seek help of your teacher or parents. Find out the percentage of people of your area who smoke. If you have a smoker in your family, confront him with the material that you have collected.
