OCR Biology F211 resit - 16th May

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Reply 220

HazyMonsoon

Original post by mmsalvatore

What was your answers on the question about where meristems can be found.

I said: pericycle inside the endodermis in the root and cambium between the xylem and phloem in the stem

Reply 221

DarkSunshine

Original post by Tiffany

what is an organ?

I wrote

An organ is a collection of tissues which coordinate to perform a specific function, in this case, tissue in liver work to produce bile.

(thats what the liver does right :confused:

)

Reply 222

Groat

Original post by DarkSunshine

I wrote

An organ is a collection of tissues which coordinate to perform a specific function, in this case, tissue in liver work to produce bile.

(thats what the liver does right :confused:

)

Yeah, but it didn't ask why the liver was an organ, so you didn't have to say the last part.

Reply 223

Tiffany

Original post by Wakefield

what did people get for the calculation of the cells that were in nuclear division? i got 18.00% but i dont know if all the parts were actual stages of nuclear division

18%

Reply 224

mmsalvatore

Original post by DarkSunshine

Roots and stem.

did it ask for which organ?

I can't remember the exact question, but no, it didn't ask about which organ. It just asked where meristem is found. I wrote Cambium and Shoot. So I am gussing I am wrong. There goes 2 marks down the drain!

Reply 225

Tiffany

what is the definition of active transport? was that one of the questions?

Reply 226

Tiffany

Original post by DarkSunshine

I wrote

An organ is a collection of tissues which coordinate to perform a specific function, in this case, tissue in liver work to produce bile.

(thats what the liver does right :confused:

)

yeah thats what i wrote and wrote last part just incase!!

Reply 227

Signed Solution

For the question about where the meristem is found, I put the cambium and the tip of a shoot. Wasn't that what they wanted?

Reply 228

DarkSunshine

Original post by Groat

Yeah, but it didn't ask why the liver was an organ, so you didn't have to say the last part.

fair enough, :smile:

But in a past paper, i remember seeing them ask the same things about the lungs.. where it said
"Dont accept function - unqualified." soo.. it can't hurt to write it right?
-but, yes, given that it was a two mark question, it can't have been too specific

Reply 229

mmsalvatore

Original post by Signed Solution

For the question about where the meristem is found, I put the cambium and the tip of a shoot. Wasn't that what they wanted?

Thats what I did. But the book says Meristems are found at the roots and shoot tips, and in ring of tissues in the stem or trunk.
That was a 2 Mark question, right?

Reply 230

DarkSunshine

Original post by mmsalvatore

Thats what I did. But the book says Meristems are found at the roots and shoot tips, and in ring of tissues in the stem or trunk.
That was a 2 Mark question, right?

yeah, two marks :smile:

Reply 231

jndk109

Original post by DarkSunshine

fair enough, :smile:

yeah but it was stating an example as the liver the past paper specifically asked why are the lungs organs not what is an organ in genral ! :smile:

i put an organ is a group of two or more tissues that work together to prvide an overall,vital, bodily function

Reply 232

jndk109

the one about meristem cells i also put pericycle and cambium

Reply 233

Tiffany

what did you write for source sink or neither?

Reply 234

God Help Me

Original post by aedai

when was there a question about root hair cells?(I sware I didn't miss any pages as I went through it afterwards.)

hm people were saying that the spirometer trace goes slightly down but if you're at rest it should go constant and flat.

annoys that nothing came up about lymph fluid and transpiration.

I was the same with the spirometer oxygen uptake. I just wrote random stuff :frown:

Was the first long question about elastic tissue.. squamous epithelium and things?

there was so much about the heart :frown:

I wasn't confident about any of those questions to be honest. I've seen nothing written about them in the book.

Spirometer goes down even if you are at rest because CO2 is absorbed by soda lime, so the overall volume of gas decreases in the chamber. The trace is the same shape but it inclines downward .

EDIT : Woops someone had already said that.

Reply 235

jndk109

for the translocation i put the companion cell actively pumps H+ ions out of the cell this creates a diffusion gradient. The H+ the diffuse back into the companion cell boud to another molecule (eg sucrose). The do so through cotransporter proteins. This again creates a diffusion gradient so the sucrose diffuses into the phloem through the plasmodesmata. This creates a very low water potential so water moves into the phloem creating hydrostatic pressure :smile:

Reply 236

mmsalvatore

Original post by Tiffany

what did you write for source sink or neither?

I did, Source, Neither, Source.
But I think that wrong.

Reply 237

jndk109

Original post by Tiffany

what did you write for source sink or neither?

i wrote sink,neither,sink

Reply 238

God Help Me

Original post by ciarangc

Sounds good to me. I mentioned no cell contents also and the fact the companion cells were metabolically very active. Ok paper on the whole. Didnt enjoy the question on the spirometer much. :frown:

Wrote the exact same thing :biggrin: