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Cellulose, and something else

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Cellulose, and something else

Postby dostanio@hotmail.com » Wed Nov 08, 2006 10:05 pm

Hello, i have a 2 small questions maybe a quite stupid one, but i really want to know the answer :D.

The peanutt shell is made up of cellulose right? which can not be digested by humans so far am concerned, can it damage our digestive system by eatin the shells? and if so.. does that mean that we cant digest food that we get from plants propally? because they all contain cellulose for their cell walls.

Have plants or trees got a live span? I mean like they usually die becase lack of light, temperature etc... Imagine u put a tree to grow in a place with the right conditions ( like temperature, light, water, minerals etc ) will it keep growing under these conditions for ever ? or will it reach a point were it will die? for any reason...

am sorry i know my questions might sound a bit stupid but am very curious to the answer, thanks in advance :)
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Postby Poison » Wed Nov 08, 2006 10:32 pm

Damage our digestive system? I don't think it will. Cellulose is a carbohydrate like starch, glucose etc. But human can not digest it because we don't have the enzyme for it. Yes, they all contain cellulose for cell walls but they also contain starch, glucose etc. And we can digest them.
As a rule,plants do not have a life span. But they usually die because they are no longer able to carry enough water and nutrients to the high branches, because of diseases or because of environmental conditions.
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Postby MrMistery » Thu Nov 09, 2006 7:23 pm

hmm... well it depends on the species... i would say they do have a life span. i mean, if you were to graph the number of years a plant from a particular species lives, you would get an average with a pretty low standard deviation if you ask me. of course it depends on the species and on the environmental conditions(humans in somalia live much less than those in germany, you know).
by the way, the oldest plant in the world is a gimnosperm from what i know, about 5000 years old, from the species Pinus longivea or something like that...
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