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Higher Biology 2013

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Reply 60

Brianthewalrus

Original post by john51

Does anyone know the answer to the question that was like 'name the process by which plants remove salt?'

I'm fairly sure it was just 'active transport'

Reply 61

lovechemistry

what was the last answer on the speciation one ? like "how can you tell speciation has occured"

Reply 62

Antony1234

I said active transport and then said how the mitochondrion shows aerobic respiration occurs which provides an abundance of ATP which allows active transport to occur as it's an energy requiring process...

Reply 63

john51

I put active transport but then i got confused on the next bit when it started asking about mitochondria. the first question of section b was easy though

Reply 64

lovechemistry

Original post by john51

I put active transport but then i got confused on the next bit when it started asking about mitochondria. the first question of section b was easy though

exactly what i done haha!

Reply 65

Brianthewalrus

What the actual f**k was the meiosis question with the 'fill in the homologous chromosomes', I just put R's a B's on random bits, should have just left it blank. Essays were good, but for the first one - photosynthetic pigments and light dependent stage - how can you get 6 marks for describing water splitting? Was restraining myself from just writing out the calvin cycle as well.

Reply 66

Antony1234

Original post by lovechemistry

what was the last answer on the speciation one ? like "how can you tell speciation has occured"

I said because the sub-populations were unable to freely interbreed to produce fertile offspring...complete guess though!

Reply 67

Brianthewalrus

Original post by lovechemistry

what was the last answer on the speciation one ? like "how can you tell speciation has occured"

Breeds to produce infertile offspring or cannot breed, I think.

Reply 68

john51

Original post by lovechemistry

what was the last answer on the speciation one ? like "how can you tell speciation has occured"

I just said that the groups had been separated to different parts of the island which would have different enviroments and therefore different selective pressures.

Reply 69

lyndsaaayyy

Original post by lovechemistry

what was the last answer on the speciation one ? like "how can you tell speciation has occured"

Ah, I think I got that one! When they interbreed they will not produce fertile young as there are now to different gene pools

Reply 70

CSM1996

For the question about hummingbirds and why they have a higher body mass in summer I was like there is more nectar... then I said produced by bees instead of flowers hahah idiot :[

Reply 71

doodles!123

I hated the question about birds migrating...

Reply 72

lion542

What was the reason for the timings of the yeast, like why was it left for the times said?

Reply 73

Brianthewalrus

Original post by john51

I put active transport but then i got confused on the next bit when it started asking about mitochondria. the first question of section b was easy though

Think the mitochondria bit was to allow extensive respiration, so that there is enough ATP to absorb all the salty water against the gradient.

Reply 74

Brianthewalrus

Original post by CSM1996

For the question about hummingbirds and why they have a higher body mass in summer I was like there is more nectar... then I said produced by bees instead of flowers hahah idiot :[

Think it was so that they have enough body mass to survive migration, where they might not have a chance to feed regularly.

Reply 75

kaneboy

Original post by Antony1234

I said because the sub-populations were unable to freely interbreed to produce fertile offspring...complete guess though!

I put something like 'they'd be unable to breed to produce fertile offspring' pretty sure it's right!

Reply 76

john51

Bigger bidy mass in summer as there is increased food availability. simple as that.

Reply 77

CSM1996

Original post by Brianthewalrus

Think it was so that they have enough body mass to survive migration, where they might not have a chance to feed regularly.

Might be that but they migrate in Spring as well after Winter (well obviously) and in Winter they had a really low body mass? Idk I've completely messed up that question.

P.s. see if you didn't write "root hair cell" but then you wrote large surface area for the cell thing you wrote, would you get the mark?