Can someone kindly tell me how i can answer questions 1, 5 and 6? :( I'm trying hard to search and understand but i can't seem to find the answers. thank you so much in advance.
1 Answer
Apr 18, 2018
1) light
5) controlled variables
6) preparation of solutions can intentionally omit your target mineral
Explanation:
1) roots would not be exposed to light when in soil - black paper removes light
5) the weight, size and similarity of plants can be relatively well controlled - every experiment must control variable
6) you would prepare solutions in such a way as to add all critical salts but one (ie. not include potassium chloride as potassium is the absent element you were investigating in that sample)
