If we look at the diagram below we notice that there are soveral characteristics that both plants and seaweeds share. What function do each of these characteristic parts do for each organism? 1. What is the function of a plants lea? 2. What do you think the function of the seaweed blade is? 3. What is the function of a plants stem? 4. What do you think the function of the seaweed stipe is? 5. What is the function of a plant's roots? 6. What do you think the function of the seaweed's holdfast is?.