Qualification > Sciences

Biology Paper 1 and 3 help HERE ONLY!!!

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Feva:
wooo my last day of serious studying  ::)

then its just multiple choice... which isnt as hard :P

---

well, can anyone please explain:

Nitrogen Cycle step by step  :D
Menstrual Cycle  ;)

Thanks in advance!

+rep to everyone who helps  ;D

12345abc:
ok some1 plz explain this- describe the path played by the nervous system to enable the person to experience the sensation of taste...and plz give any tips u have in describing nervous pathways...also,plz explain the nitrogen cycle!!!

goin4dakill:
N2 (in atmosphere- 78 %)
-
-
N2 -->NO3 (Symbiotic Nitrogen fixing bacteria-in leguminous plants-peas)
-
-N2 is also changed into protein for animals to eat- they die and defeacate
and purtifying bacteria (fungi- saprophyetes) turn N2 (from faecaes) into NH3
and with help of Nirtifying bacteria- NH3 is made into NO3.
AND THEN WE  HAVE NITRATES FOR THE PLANTS!! YAYYY but thats not all..

There are also Nitrogen Fixing bacteria who turn N2---> into NO3 (without all this fancy dafeacation stuff)

AND THEN there are the bacteria (that farmers hate) because they turn the valuable NO3 back into N2

Feva:
woo thanks shelbii <3

much luv x

+rep'd before u posted -.- well do again after 2 hours  :D

goin4dakill:
Wait a minute- thats not all!

Not tooo compicated..

0-4 days- lining breaks down (the bleeding)
4-13 days- uterus lining is built up again
13-28- uterus lining is maintained-awaiting embeddment of zygote

The days are different for everyone- but thats an approximate count.

Now, the hormones.
Oestogen- is to encourage the repair of the uterus lining
progesterone- maintains the lining

FSH and LH (dont know if u have to know it- but oh well)
Follicle Stimuating hormone + luteinizing hormone- to make the ovum

Hope it Helped!
oh and ovulation (when the little egg is realeased-) happens about the 13th day- when the uterus lining is built up
 
 

 

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