Lipids in plant cells and glycogen in birds

[Chloroform]

Hello. This is my first post. I'm from Spain and I like this forum.

I was wondering what's the answer of these two questions:

- Why do plants use polysaccharides as an energy storage instead of using lipids?

- What would happen to birds if they used glycogen molecules as an energy storage instead of using triglycerides?

Greetings.

[JackBean]

Think about properties of respective storage forms.
Which is able to release more energy per weigth?