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Answer:
(ii) Arteries are thick-walled, muscular vessels that almost always carry oxygenated blood away from the heart. The muscular walls allow the arteries to pulse and help push the blood farther along the circulatory pathway as the blood travels away from the heart.
Answer:
Here is your answer-
1- Stomata are generally more numerous on the underside of leaves. They provide for the exchange of gases between the outside air and the branched system of interconnecting air canals within the leaf.
2- Arteries are thick-walled, muscular vessels that almost always carry oxygenated blood away from the heart. The muscular walls allow the arteries to pulse and help push the blood farther along the circulatory pathway as the blood travels away from the heart.
3- Plants do not need to move from one place to another. Movements in a plant are usually at the cellular level and hence a far less amount of energy is required by plants. Animals, on the other hand, need to move from one place to another; in search of food. So, the energy need of animals is pretty higher than of plants.
4- Aquatic animals breathe at a faster rate than the terrestrial animals because the amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air. To meet the oxygen need aquatic animals breathe faster to intake more oxygen.
5- The aortic and pulmonic valves close, preventing backward blood flow into the heart. The mitral and tricuspid valves then open to allow forward blood flow within the heart to fill the ventricles again.
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