CHEM AND BIO HELP AND TIPS HERE

[Raywin]

Also, sorry guys, two more questions:

1) What is the gut? Is it the stomach or the intestine?

2) What are some common tissues the exam likes to test? I know this is stupid of me, but I get confused sometimes while differentiating between organs and tissues?

And, what score should be my aim if I want to get an A*?

Gut is the region bet the stomach and the anus.
Tissues are a group of SIMILAR cells working together. Organs are a group of similar tissues working together.
And an A*, it mainly depends on ur P3 performance.

[Raywin]

Ok thank you I get it now
So does less sunlight (reduced photosynthetic rate) cause the plant to turn yellow?
Or is that only because of reduced chlorophyll (meaning reduced, or no, magnesium ions)?

Light will just reduce the rate of photosynthesis. It is chlorophyll that gives the plant the green colour. And Mg is needed for chlorophyll synthtsis. So yes its the Mg deficiency that would make a plant turn yellow.

[Raywin]

thanks for all your help! +rep
anyone know how i can make the .png file where i can crop a part of the pdf and attach it to my post for you guys to download?

Np, Glad to help.

[IGCSE AWESOME STUDENT]

hey, who thought the CHEM P3 was a bit tough?

[Vin]

thanks for all your help! +rep
anyone know how i can make the .png file where i can crop a part of the pdf and attach it to my post for you guys to download?

I have it in-built on my win7. Google "snipping tool" you'll get some links.

[Raywin]

I have it in-built on my win7. Google "snipping tool" you'll get some links.

Hahaha, lucky you, i have to do a screenshot, paste it on word and then crop it and then paste it on paint and edit and all tht and then save it as png thingi.. THEN i can attact it.

[Raywin]

hahaha, okay maybe i'll just attach the file each time and just say the question number

Does peristalsis work when one's lying down?

Hahaha, lol tht was a Q in a past paper or curiosity?  It does work even if ur upside down..

[8T]

Hi guys i need help in Bio if possible in one of paper 1's (O/N 03) First question Link:http://freeexampapers.com/FreeExamPapers.com_.php?__lo=SUdDU0UvQmlvbG9neS9DSUUvMjAwMyBOb3YvMDYxMF93MDNfcXBfMS5wZGY=
 Answer is :A So i guess plants excrete but what ??

[Vin]

Hi guys i need help in Bio if possible in one of paper 1's (O/N 03) First question Link:http://freeexampapers.com/FreeExamPapers.com_.php?__lo=SUdDU0UvQmlvbG9neS9DSUUvMjAwMyBOb3YvMDYxMF93MDNfcXBfMS5wZGY=
 Answer is :A So i guess plants excrete but what ??

O2 and/or CO2

[Raywin]

lol really? haha that's pretty cool just curiosity

WHY IS IT THAT I GET ALL OF THE HARD QUESTIONS RIGHT AND MESS UP ON THE EASY ONES?         

Hahaha, lol it happens sometimess..

[Raywin]

Okay guys, I realize this isn't anywhere in our syllabus, I'm just curious...

Why is it that when we don't eat for a while (like you barely ate anything for 12 hours), our stomach starts hurting because of hunger?

How is that possible?

If anyone has any idea.....

Lol, interesting Q, hmmm i think its because,
Normally our stomach produces HCl constantly. And well, when you dont eat for like 12 hrs like u said, the hcl umm builds up and its uncomfortable, which is why it hurts us. hahaha.. i just gave it a try..

[8T]

O2 and/or CO2

Ya that just slipped XD Thank You

[8T]

hey, who thought the CHEM P3 was a bit tough?

I did !

[8T]

ALL living organisms display those characteristics. Excretion isn't just..what you're thinking. lol
The syllabus defines excretion as: "the removal from organisms of toxic materials, the waste products of metabolism, and substances in excess of requirements (E.G. CARBON DIOXIDE)"
This is just one example, but plants respire, which means they use up oxygen and release CO₂, same as humans do, and therefore they essentially excrete CO₂.
I hope this helps?

HAHA yes thts what i was thinking :S
Ya it helped much Thanks u already have by now +rep

[Vin]

Okay guys, I realize this isn't anywhere in our syllabus, I'm just curious...

Why is it that when we don't eat for a while (like you barely ate anything for 12 hours), our stomach starts hurting because of hunger?

How is that possible?

If anyone has any idea.....

Hurting or "growling"? You know the muscle stomach churns partially digested food or chyme. So this churning of mixture of solid and liquid food and gases produces sound, which is too low that's is why you cant hear the noise when your stomach is full. If your stomach is empty the noises are louder so you can hear them. Um, a practical experiment. Fill a bottle with 6-7 beads. Shake it, produces sound. Fill the bottle with beads till the bottle neck, shake. No sound. That is what prolly happening.