.. WRITE ONE WORD FOR THE FOLLOWING
1. Respiration in the presence of oxygen
2. A process in plants that occurs in mitochondria
3. Small air sacs at one end of bronchioles
4. The process that helps the body get energy from food
5. The respiratory organs present in the leaves and woody stems
Answers
Explanation:
.. WRITE ONE WORD FOR THE FOLLOWING
1. Respiration in the presence of oxygen
2. A process in plants that occurs in mitochondria
3. Small air sacs at one end of bronchioles
4. The process that helps the body get energy from food
5. The respiratory organs present in the leaves and woody stems
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.
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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.
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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.
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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.
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Question 3:
What process occurs during cellular respiration?
ANSWER:
During cellular respiration, the sugar present in the food is selectively oxidized to produce water and carbon dioxide. In this process, some amount of energy is also released which is used by cells for different processes.
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Question 4:
Cellular respiration can occur even without oxygen. What is such respiration called?
ANSWER:
Cellular respiration that occurs without the presence of oxygen is termed as anaerobic respiration.
Answer:
1. Aerobic respiration
4. respiration