Question

why there is need of special tissues or organs for transport of substances in plants and animals​

Answer 1

Answer:

Plant and animal both have complex body mechanism to live their life throughout. Therefore to maintain this process they needs some special tissue or organs because of high energy requirement and transport the food and oxygen to each and every cell of the their body.

Explanation:

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Answer 2

In plants for transportation special tissues called as xylem and phloem are present.

And animals have their transportation system. If these special tissues are not present in both of these species then no proper transportation will take place.