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laithmo96
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#2281
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#2281
If there was a question about how water moves through the roots to the leafs would we have to mention the apoplastic and symplastic pathway?
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oak12
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#2282
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#2282
topics that may appear (based on them not really featuring), i theorise:

- meiosis aspects
- exchange in insects
- exchange in fish
- absorption in roots of plants
- xerophytes
- conjugation

(atleast 2!)
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oak12
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#2283
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#2283
(Original post by laithmo96)
If there was a question about how water moves through the roots to the leafs would we have to mention the apoplastic and symplastic pathway?
depends on number of marks, more then 3, then probably so
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blondie24
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#2284
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#2284
(Original post by PKMN TRN JAM)
1 question,
Is there fluid in any part of an insect's tracheoles?
Teachers have told me different to my textbook unless I either wasn't listening or somehow can't read.

Quote me please
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I think there is but right at the end of the tracheoles but i don't think we need to specifically know about the fluid. I think the respiratory gases diffuse from the tracheoles in to the fluid and then into respiring cells
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elliewoodheadx
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#2285
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#2285
Is this right?
Vena cava: deoxy blood from the lower body to the heart
Aorta: oxy blood from the heart to the whole body
Pulmonary artery: deoxy blood from the heart to lungs
Pulmonary vein: oxy blood from the lungs to the heart
Hepatic artery: oxy blood from the heart to gut/liver
Hepatic portal vein: partially oxy blood from gut to liver
Hepatic vein: deoxy blood from liver to heart
Renal artery: oxy blood from the heart to the kidneys
Renal vein: deoxy blood from kidneys to the heart

:confused:
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laithmo96
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#2286
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#2286
(Original post by oak12)
topics that may appear (based on them not really featuring), i theorise:

- meiosis aspects
- exchange in insects
- exchange in fish
- absorption in roots of plants
- xerophytes
- conjugation

(atleast 2!)
Can you please summaries ''absorption in roots of plants'' thanks
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oak12
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#2287
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#2287
(Original post by dooobie_)
I think antibiotics and cell cycle will definitely come up. If there are big markers about plants I'm screwed because I find it so hard!

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any questions on it?
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SophieL1996
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#2288
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#2288
has there ever been any q's about fish or insects?
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oak12
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#2289
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#2289
(Original post by laithmo96)
Can you please summaries ''absorption in roots of plants'' thanks
ok:

- mineral ions are absorbed by active transport, from the soil to the xylem via the roots
- this lower water potential in the xylem
- so water follows in by osmosis

- water takes a path thru the root hair cells, then cortex cells, then endodermis cells into the xylem

- it may move in by the symplast pathway, this is directly thru the cells via the cytoplasm
- the cells are connected to each other by the plasmodesmata

- the water may also move in by apoplast pathway, this is between cells and in the cell wall
- this occurs between the cells until the endodermis cells
- they have a casparin strip, an impermeable waterproof barrier
- water moves into the endodermis cell and then into the xylem
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oak12
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#2290
(Original post by SophieL1996)
has there ever been any q's about fish or insects?
i remember ones on fish
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Manni
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#2291
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#2291
(Original post by SophieL1996)
has there ever been any q's about fish or insects?

Fish yes, insects no
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SophieL1996
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#2292
(Original post by Manni)
Fish yes, insects no
which past paper do you know? as I cant find it
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madmadmax321
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#2293
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#2293
(Original post by oak12)
topics that may appear (based on them not really featuring), i theorise:

- meiosis aspects
- exchange in insects
- exchange in fish
- absorption in roots of plants
- xerophytes
- conjugation

(atleast 2!)
That would be ****ing perfect if they all came up I think i'd have to kiss my paper lol
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Meathead-jack
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#2294
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#2294
Do they always give you the species diversity index formula in this exam???
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Hi, How are you ?
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#2295
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#2295
(Original post by PKMN TRN JAM)
1 question,
Is there fluid in any part of an insect's tracheoles?
Teachers have told me different to my textbook unless I either wasn't listening or somehow can't read.

Quote me please
REP AVAILABLE
I think so, in some question I v'e done they talked about the fluid moving into the tissue to reduce the diffusion pathway, I think. So technically yes I suppose. Our teachers haven't talked about it either.
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Manni
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#2296
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#2296
(Original post by SophieL1996)
which past paper do you know? as I cant find it
fish one is june 09 q8
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lorobolorolo
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#2297
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#2297
(Original post by ibmb24)
Not sure exactly why, but in the process of CO2 getting in the leafs they diffuse into the air spaces and move down the diffusion gradient to the mesophyll cells that use it up for photosnthesis
Thanks
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Suzanna5678
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#2298
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#2298
(Original post by oak12)
its for mammal size and affinity, should read:

- smaller the mammal
- larger the surface area to volume ratio
- more heat loss
- respires more to generate heat
- curve is to the RIGHT
- lower affinity
- so more oxygen is unloaded to respiring cells
Is it the opposite for a large mammal ?
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dooobie_
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#2299
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#2299
My head is bouncing off of this revision!

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SophieL1996
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#2300
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#2300
(Original post by Manni)
fish one is june 09 q8
thanks
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