Register to reply

A few questions concerning photosynthesis experiments

by iknownth
Tags: experiments, photosynthesis
Share this thread:
Apr23-13, 03:59 AM
P: 16
For the iodine test,
How does boiling alcohol speed up the diffusion of chlorophyll out of the cells?
Why does the leaf become crisp and breaks easily after it has been dehydrated by alcohol?

For the detection of oxygen produced from photosynthesis,
Why does sodium hydrogencarbonate solution decompose in water?
How does the stoppers allow CO2 outside the funnel diffuse to the aquatic plant? (I really dont get it)

For the investigation of the need for CO2 in photosynthesis,
How does potassium hydroxide absorb CO2?
Phys.Org News Partner Biology news on
Manatees could lose their endangered species status
Philippine tarsier gets boost from Kansas research, and genetic proof of a new variety
Pangolins under threat in Gabon as demand surges in Asia
Simon Bridge
Apr23-13, 06:09 AM
Sci Advisor
HW Helper
Simon Bridge's Avatar
P: 12,739
You should be able to answer those by considering what you already know about the properties of materials.

Do some things dissolve better in alchohol than water?
Does boiling generally extract pigments better than just soaking? (Think: red cabbage.)
What happens to the leaves on plants, in general, all around you, when they get dry?
Why would that be? What does a leaf do with the water it contains?

You have a question about dissolving, and another about a chemical reaction.
You know that reactions happen.

However - if you feel there is a lot of "magic black box" work in the school demo of photosynthesis, you are correct. You actually need lots more study to understand the proof. Right now you pretty much have to take the teachers word for what happens ... just like you have to take the teachers word that lime water goes cloudy when carbon-dioxide is bubbled through it.

Register to reply

Related Discussions
Quesitons on Gas firing a lab furnace General Physics 1
Fundemental quesitons within physics General Discussion 11
Quesitons on electrostatics Introductory Physics Homework 7
Some quesitons about Sun and Earh General Physics 5
Practice Test Quesitons Introductory Physics Homework 11