Differentiate the following
a)External and internal respiration
b) Aerobic and anerobic respiration
c) photosynthesis and respiration
Answers
Answer:
A.
External respiration occurs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the alveolar air. Internal respiration occurs in the metabolizing tissues, where oxygen diffuses out of the blood and carbon dioxide diffuses out of the cells.
B.
Aerobic respiration needs oxygen to occur, while anaerobic does not. This presence of oxygen determines what products will be created. During aerobic respiration, carbon dioxide, water, and ATP are produced. During anaerobic respiration, lactic acid, ethanol, and ATP are created.
C.
Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water
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Page No 120:
Question 1:
Respiration and breathing are the same. Do you agree? Give reasons.
ANSWER:
No, respiration and breathing are not similar processes. Breathing is a part of respiration in which inhalation and exhalation are carried out. The respiration process, on the other hand, involves the complete oxidation of food molecules to release energy.
Page No 120:
Question 2:
Exchange of gases for respiration occurs in both plants and animals. In which of these is the rate of exchange of gases faster?
ANSWER:
The rate of exchange of gases for respiration is faster in animals as compared to the plants. This is because animals possess a well developed organ system for breathing but plants do not possess such developed organ system.
Page No 120:
Question 3:
Exchange of gases in animals takes place in many ways. Name three.
ANSWER:
The gaseous exchange in animals can occur through following ways:
1. Gaseous exchange can occur through skin or cell membrane in animals such as Hydra and Amoeba.
2. Some insects such as grasshoppers exchange gases through air holes.
3. Mammals such as birds and humans perform gaseous exchange through lungs.
Page No 124:
Question 1:
In humans, the exchange of gases occurs in the lungs. In which part of the lungs does it take place?
ANSWER:
The gaseous exchange in the lungs occurs in the alveoli. These are microscopic sac like structures that exchange gases with the blood.
Page No 124:
Question 2:
Oxygen is carried to the cells by the blood. In what form is oxygen carried in the blood?
ANSWER:
The oxygen exchanged from the alveoli of the lungs is carried to different cells of the body in the form of oxyhaemoglobin. It is formed by the binding of oxygen to the haemoglobin of the blood.