Q1. Which important function is carried out by the human heart? Solution The heart beats continuously to act as a pump for the transport of blood throughout the body. Q2. List the factors which affect transpiration. Solution Factors affecting transpiration are Sunlight: During the day, the rate of transpiration is faster because stomata remain open which allows the inward diffusion of carbon dioxide for photosynthesis. Temperature: Transpiration is faster in summer as compared to winter. Wind: Transpiration is more when wind blows faster because water vapour is removed more quickly from the leaves. Humidity: Transpiration is reduced if the air is humid. Q3. How the deoxygenated blood is reoxygenated? Solution The deoxygenated blood from different parts of the body enters the right auricle and is sent to the right ventricle. From here, the blood is pumped through the pulmonary artery to the lungs for reoxygen...