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Yogita Ingle 5 years, 8 months ago
- Exchange of gases takes place between the alveoli of lungs and the surrounding blood capillaries. The two main gases exchanged are oxygen and carbon-dioxide. Oxygen is absorbed by the blood capillaries from the lungs alveoli by diffusion while carbon-dioxide is absorbed by the lungs alveoli from blood capillaries by diffusion.
- Transport of oxygen and carbon-dioxide occurs with the help of respiratory pigment called hemoglobin.
- Hemoglobin, the iron containing respiratory pigment is a red colored pigment of blood, which has a very high affinity for oxygen. Hemoglobin though is purple colored but oxy-hemoglobin is of bright red color. Oxygen is transported from lungs to the body cells in the form of oxy-hemoglobin.
- Carbon-dioxide is transported from the body cell to the lungs in the forms of carboxy-hemoglobin, carbonic acid, bicarbonates of sodium and potassium.
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Palak Tyagi 5 years, 3 months ago
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- Forests are large regions of land covered with tree, shrubs, herbs. It sustains a variety of life forms.
- Naturally occurring plants and animals are the flora and fauna of the forests.
- Forests are biodiversity hotspots.
- The loss of forests and wild life leads to the ecological imbalance.
- Hence, it is important to conserve forests and wild life.
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Gaurav Seth 5 years, 10 months ago
The Non-Cooperation Movement in the cities gradually slowed down for various reasons
(i) Khadi cloth was often more expensive than mass produced mill cloth and poor people could not afford to buy it.
Thus, boycott of foreign goods could not continue for long.
(ii) Similarly, the boycott of British institutions posed a problem. No alternative institutions were set-up in their . place. So, the students, teachers and other professionals finally had to resume their studies and jobs in government institutions like schools, colleges, courts etc.
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