Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
Ivo:
Please can someone explain these doubts.
the_grim_reaper:
--- Quote from: aangel42 on June 07, 2010, 07:12:16 pm ---Okay, this is really frustrating my textbook (Mary Jones) and study guide (Dave Hayward) DO NOT cover fertility in women in depth. I'm getting all the menstrual cycle questions/related questions wrong.
Someone please help with M/J 03 Q27 (attached) and why it's not D, because doesn't the egg take a couple days to pass down?
Also about the lining shedding and thickening and stuff, what are the days this happens? I think I asked before, and Vin said that ovulation happens around day 14?
--- End quote ---
lol the egg doesn't exactly last "a couple of days." It can only survive for about 24 hours after being released. And sperm can survive inside the female for about 2-3 days. So there's hardly a period of 4 days when fertilisation can occur. Thus it must be C (remember fertilisation should be around ovulation). Secondly, the time period for D is too large. Thirdly, the sperm don't really fertilize an ovum in uterus. They do it when the egg is moving down and is in the oviducts. Thus it must be C.
Do you have IGCSE Biology by DG Mackean?? (the book of that study guide?) it covers this aspect in a lot of detail...
Ivo:
--- Quote from: aangel42 on June 07, 2010, 07:19:13 pm ---Well the first is D...
--- End quote ---
Please can someone explain. I thought photosynthesis (plant nutrition) absorbs carbon dioxide and gives off oxygen. Why respiration?
SNA:
--- Quote from: aangel42 on June 07, 2010, 07:12:16 pm ---Okay, this is really frustrating my textbook (Mary Jones) and study guide (Dave Hayward) DO NOT cover fertility in women in depth. I'm getting all the menstrual cycle questions/related questions wrong.
Someone please help with M/J 03 Q27 (attached) and why it's not D, because doesn't the egg take a couple days to pass down?
Also about the lining shedding and thickening and stuff, what are the days this happens? I think I asked before, and Vin said that ovulation happens around day 14?
--- End quote ---
it is C as that when ovulation (release of an ovum ) occurs thus, the female is most fertile. for D, this is when the lining thicken, in preparation for implantation to occur if fertilisation takes place. if fertilisation does not happen, the thickening uterus wall will break down causing menstruation. hope this helps!^^
.
SNA:
--- Quote from: Ivo on June 07, 2010, 07:21:03 pm ---Please can someone explain. I thought photosynthesis (plant nutrition) absorbs carbon dioxide and gives off oxygen. Why respiration?
--- End quote ---
without presence of sunlight,(usually at night) plant respire ,releasing co2.
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