s2 science homework

[Stephie333]

Hi i was un sure if this is right is it ?

 

 

the sun is the source of energy for all foods. only plants can produce their own food . this is called ___________ and we can test for it using iodine, this turns blue black in the presence of ____________.

 

i didnt now some of it

is it right ?

[Mr Skeptic]

It's not strictly true. Autotrophs create their own food, and although green things are the biggest group of them, not all the green things are plants (eg algae and cyanobacteria). Some don't even use photosynthesis such as the ones living in caves and near thermal vents.

[Stephie333]

00this is the page i dont really understand it can anyone help me or explan it ?

Edited October 4, 2010 by Stephie333

[Mr Skeptic]

Oh I see, you answered part of the first question and were asking if it is correct. Well, it's close enough to true for school. It's a nasty little truth that a lot of what you learn in school is half-truths, because the whole truth is always more complicated.

 

Looks to me like you need to study a little more about photosynthesis.