Question
Single circulation and Double circulation.
| Single circulation | Double circulation |
| 1. Blood flows only once through the heart in a complete cycle. | 1. Blood flows twice through the heart during one complete circulation. Systemic – to and fro ‘ from heart to body and pulmonary – to and fro from heart to lungs. |
| 2. Heart pumps deoxygenated blood only. | 2. Heart pumps both deoxygenated and oxygenated blood to lungs and body respectively. |
| 3. Blood is oxygenated in gills. | 3. Blood is oxygenated in lungs. |
| 4. Occurs only in fishes. | 4. Occurs in amphibians, reptiles, birds and mammals. |
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| Column A (Adaptation) | Column B (Type of pollination) |
| (1) Sticky, spiny pollen grains non-fragrant flowers | (a) Anemophily |
| (2) Feathery stigma and versatile anther | (b) Chiropterophily |
| (3) Presence of nectar glands and sweet smell | (c) Ornithophily |
| (4) Dull coloured flowers with strong fragrance | (d) Entomophily |
| Cardiovascular disorders | Symptom |
| Coronary Artery Diseases (CAD) | Deposition of calcium, fat, cholesterol and ——————— |
| —————- | Pain in chest resulting from reduction in the blood supply to the cardiac muscles. |
| Silent Heart Attack | Myocardial infarction without ———————- |