an experiment to prove plants produce carbon dioxde during respiration. ks4?

Question

An exam question is showing an experiment to prove snails produce carbon dioxide. It then asks how you can modify the experiment to prove plants produce carbon dioxide during repiration. I can only think of putting the plant in the dark and testing the gas. But how would you test it. Lighted splint going out is not conclusive enough and would there be enough carbon dioxide anyway. Thanks

Answer 1

carbon dioxide turns limewater cloudy.

Answer 2

There is an indicator you can use which changes colour depending if carbon dioxide or oxygen is being produced. I can't remember if it is methyl orange or methyl yellow.
If you put some of this indicator in the bottom of a boiling tube, you can then place a small gauze platform into the tube, on which you can put a plant sample suspended above the liquid.You need to seal the boiling tube with a bung. Then place the whole thing in the dark and see what colour the indicator turns.
This does work, its an experiment I use with my pupils - I just can't remember which indicator it is!! Sorry.

Answer 3

omg i had the same question on a pretice exam i did last year i was like ahh omg what do i do, so what i say was to place a plant in a dark room under a lamp with some of the plant in a test tube filled with lime water, if CO2 is preasent the lime water should go cloudy..i never knew if it was right but i figured it was worth a try xxx

Answer 4

Try and get it to breathe into some lime water because carbon dioxide turns lime water cloudy and this is an experment you can do to test for carbon dioxide, have you tried looking on the internet to see if they have the answer? try this web page http://www.uq.edu.au/_School_Science_Lessons/PlantUnd.html#Lesson5

Answer 5

bubbling co2 thru an indicator will prove the prescence of the gas. the lighted spill is only used as a test for oxygen as no inert gasses support combustion. (how do you differentiate?)

now go find out what solution is used... to be honest i left school 30 years ago, and ive forgotten, but i know it goes milky in the prescence of co2.

Answer 6

As I recall from my long ago school days the test for co2 was to bubble it through limewater and if co2 were present the limewater turns milky.

Answer 7

Plant do not excrete carbon dioxide, they excrete oxygen in which man breathes. Man excretes carbon dioxide in which plants take in.

Answer 8

Specific - => KS1 => KS2 => KS3 => KS4 => KS5 =>

Answer 9

carbon dioxide react with .....
i dnt exactly.
but it can be tested in lab