Why do larger, multicellular (many-celled) plants need a transport system?
Answers
Answer:
Because some plants can be too tall, thus transfer of substances can not only take place through diffusion. So, plants need a transport system
Answer:
As the size of an organism increases, it's surface area to volume ratio decreases. Large multicellular organisms therefore cannot rely on diffusion alone to supply their cells with substances such as food and oxygen and to remove waste products. Large multicellular organisms require specialized transport systems.
Larger plants and animals need transport systems and to ensure that they have sufficient absorbing surface area. This could be additional surfaces, such as the digestive system and lungs in animals, or adaptations such as the flattened shape of leaves, which increase their surface area.