plz help me wif tis~thx~

[micching1204]

Both lipids and carbohydrates can be used as energy-storage molecules.
Lipids store more energy per gram but carbohydrates are easier to break down.
Why annimals use both glycogen and fat as energy stores while plants only use starch?

[honee_v]

plants produce starch for use as energy storage polymer but plants also produce fats (another source of energy). Monounsaturated fats can also be found in nuts and olive oils, while polyunsaturated fats in sunflower and corn... Animals (or humans) would store energy as fats (aside from glycogen) since fats are less bulky than starch and are therefore suitable for mobile animals... would you rather see yourself gaining additional pounds when in stead of fat, youd store starch (of about the same energetically equivalent amount of fat)?

Basically starch and glycogen has similar function: They are main forms of carbohydrate storage for plants and animals, respectively. They differ mainly in their structure-- that is glycogen being more extensively branched... Plants (however) produce starch and later on can undergo drying process (particularly in seeds).. Animals cannot store energy that is equivalent to plants storing 'dry starch'... since in animals, glycogen storage is associated with a concomitant storage of water..