The transport system is necessary for a plant or an animal because of the following reasons:-
1) In plants, water and dissolved minerals are transported from roots to leaves by xylem whereas prepared food is transported from leaves to all parts of the plant by phloem. If there were no transport system in the plant, leaves would not get water for photosynthesis and thus, they would die.
2) In the case of animals, food and water are transported to all parts of the body so; they can generate energy and grow cells. Similarly, waste products produced by the cells of the body are transported to their excretory organs so that they can be excreted. If there were no transported system in animals, they would not be able to get energy or get rid of the waste. Thus, they would die.
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