Psyxwar's Biology 3/4 Question Thread

[AbominableMowman]

For an experiment that tests the following types of light (white, red, blue, green) on photosynthesis, what would be a suitable hypothesis?

Something like "that white light will result in the highest photosynthetic rate, followed by red, blue then green" doesn't seem like a good hypothesis, but I'm not sure what else to put.

Ideally, the plants receiving the light that is the closest wavelength to sunlight (yellow/red) should have a higher photosynthetic rate than those receiving blue/green light.
Something along those lines... is what I used for my tropisms prac..

[psyxwar]

Ideally, the plants receiving the light that is the closest wavelength to sunlight (yellow/red) should have a higher photosynthetic rate than those receiving blue/green light.
Something along those lines... is what I used for my tropisms prac..

Sunlight isn't yellow or red though.

[pi]

This might help

[Bad Student]

You could say something like "the blue wavelength of light causes a higher rate of photosynthesis compared to other wavelengths"

[AbominableMowman]

Sunlight isn't yellow or red though.

But its closer to that wavelength isnt it 0_o

[psyxwar]

But its closer to that wavelength isnt it 0_o

I thought it was white? O_O

This might help

(Image removed from quote.)

Thanks, but I mean actually wording the hypothesis. Is it viable to write say, "x is better than y, which is better than z" and so on? It seems like a really bad hypothesis.

Another thing: if my experiment is testing the photosynthetic rate of leaf discs in water, would red light be more effective than blue light (regardless of what the action spectrum seems to imply) because water reflects blue light/ absorbs red light stronger?

[AbominableMowman]

I thought it was white? O_O

That might explain why I lost a mark on my hypothesis... LOL

[Bad Student]

That might explain why I lost a mark on my hypothesis... LOL

My school only assesses the format and wording of the hypothesis. The actual prediction itself is allowed to be wrong. They always follow it up with a question such as "Do the results support your hypothesis?".

[psyxwar]

Actually am I just allowed to reference the action spectrum of the plant?

[pi]

That might explain why I lost a mark on my hypothesis... LOL

Yeah sunlight is white light -_-

[psyxwar]

Would it be necessary to use a buffer if I was comparing the photosynthetic rate of leaf discs in water vs bicarbonate solution (to account for the pH difference?)?

[rice]

Would it be necessary to use a buffer if I was comparing the photosynthetic rate of leaf discs in water vs bicarbonate solution (to account for the pH difference?)?

That'd impress whoever's marking it. As long as you show you are trying to control all the variables you should be fine. 

because water reflects blue light/ absorbs red light stronger?

I'm guessing you won't be using a sufficient volume of water in your experiment for this to have an influence on results.

[Yacoubb]

Would it be necessary to use a buffer if I was comparing the photosynthetic rate of leaf discs in water vs bicarbonate solution (to account for the pH difference?)?

But would that make much of a difference, lol?

[AbominableMowman]

Hey guys got a question . 
Are T cells considered as antigen-presenting cells or are antigen presenting cells just macrophages, B cells and dendritic cells?
Immunity confuses the shit outta me

[Russ]

T cells are activated by APCs but are not APCs themselves. Those three you listed are indeed APCs