4. Answer the following questions in 60-80 words:
a) Describe the process of fertilisation in plants with the help of a diagram
b) Explain double circulation and state its importance in the human body.
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b. It is called a double circulatory system because blood passes through the heart twice per circuit. ... The left pump sends the newly oxygenated blood around the body. By the time this blood returns to the heart, it has returned to a deoxygenated state.
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