Biology Paper 22 Discussion thread.

[Haris Sal11]

The lupins question did mention commercially...It was Q3(b)
it didnt say anythng abt cultivated...you are confusing it with the quesiton in the past papers....they are not exactly the same.....
also writing and self and cross pollination in the other one is a pretty major mistake.

That's the same question in which they gave Nitrogen cycle, right?

 

[thementor]

That's the same question in which they gave Nitrogen cycle, right?

The lupins one was the nitrogen cycle one.

 

[Haris Sal11]

The lupins one was the nitrogen cycle one.

Exactly. What was the answer to the next part? The two reasons why they grow short in high altitude areas.

 

[thementor]

Exactly. What was the answer to the next part? The two reasons why they grow short in high altitude areas.

less oxygen, low temperature, less sunlight due to clouds...etc..

 

[Snowysangel]

Oh God!....first all since the question said cotnrolled conditions, writing abt a greenhouse wouldnt be particulary right....
u had to write abt asexual reproduction....n Q6(b)

Have u ever taken off time to go over marking schemes? Just someone in mama parsi...they usually get distinctions in bio.
Asexual rep and self pollination give more or less the same results...I can bet the ms would've mentioned both, if not just aelfpollinatiob...

 

[thementor]

Have u ever taken off time to go over marking schemes? Just someone in mama parsi...they usually get distinctions in bio.
Asexual rep and self pollination give more or less the same results...I can bet the ms would've mentioned both, if not just aelfpollinatiob...

self pollination involves fusion of male and female gametes...asexual reproduction dosent...how can they give the same results....

 

[Snowysangel]

self pollination involves fusion of male and female gametes...asexual reproduction dosent...how can they give the same results....

Do u remember the exact question?

 

[thementor]

Do u remember the exact question?

Explain why plants grown in this way, show less variety and are weaker and smaller than plants grown in other ways?

That was the question

 

[Snowysangel]

self pollination involves fusion of male and female gametes...asexual reproduction dosent...how can they give the same results....

They would be less varied and beget relatively smaller plants...

 

[Snowysangel]

Explain why plants grown in this way, show less variety and are weaker and smaller than plants grown in other ways?

That was the question

Yeah so why would they be weaker and smaller, if they're grown asexually? Aelfpollinatiob produces less viable seeds that don't grow as much...

 

[Snowysangel]

Explain why plants grown in this way, show less variety and are weaker and smaller than plants grown in other ways?

That was the question

As long as you supported your answer with sufficient evidence and it makes sense thereafter, I don't see how it will be marked wrong....that's what happens in literature

 

[thementor]

Yeah so why would they be weaker and smaller, if they're grown asexually? Aelfpollinatiob produces less viable seeds that don't grow as much...

in asexual reproduction no variation occurs so no evolution occurs...etc......they would eventually get weaker bcoz, recessive alleles would start to build up..in the population...a single genetic allele coudl wipe out an entire population..Also overcrowding and competition for food, makes the plants weaker....

 

[thementor]

As long as you supported your answer with sufficient evidence and it makes sense thereafter, I don't see how it will be marked wrong....that's what happens in literature

yeah...but this isnt literature.....This is science...however your point is absolutely right...If you give enough accurate facts to support it its correct.....well lets see wat happens when the results come out;.

 

[Snowysangel]

in asexual reproduction no variation occurs so no evolution occurs...etc......they would eventually get weaker bcoz, recessive alleles would start to build up..in the population...a single genetic allele coudl wipe out an entire population..Also overcrowding and competition for food, makes the plants weaker....

How do alleles get built up...that happens in selfpollination. In asexual, the alleles are passed on as they are. Overcrowding can happen in selfpollination as well

 

[Snowysangel]

Okay let's stop here. I've 13 more exams to study for :/

 

[thementor]

How do alleles get built up...that happens in selfpollination. In asexual, the alleles are passed on as they are. Overcrowding can happen in selfpollination as well

http://2007.botanyconference.org/engine/search/index.php?func=detail&aid=1147
Aexual Reproduction promotes inbreeding, nd inbreeding results in build of recessive alleles in a population

 

[thementor]

Okay let's stop here. I've 13 more exams to study for :/

oh sorry for keeping you occupied here.....good luck for your exams...Wish you all the best..
and again apologies for arguing...we'll see what happens when the results come out

 

[Snowysangel]

http://2007.botanyconference.org/engine/search/index.php?func=detail&aid=1147
Aexual Reproduction promotes inbreeding, nd inbreeding results in build of genetic alleles in a population

Yeah the same type of alleles..the s
Daughter plant will have the same no of recessive alleles as the parent plant... Accumulation of such alleles occurs in selfpollination. Besides I'm not saying asexual is wrong..but I'm positive that selfpollination isn't either

 

[thementor]

Yeah the same type of alleles..the s
Daughter plant will have the same no of recessive alleles as the parent plant... Accumulation of such alleles occurs in selfpollination. Besides I'm not saying asexual is wrong..but I'm positive that selfpollination isn't either

oh...yeah...okay...no self-pollination is also nt wrng.....wikipedia says that self-pollination and asexual mitoitc reproduction both result in buildin up of recessive alleles.

 

[devilmaycryred]

Man , almost everyone got this right , this is not the thing that should be discussed ... what was the answer to that 'hole above diaphragm' question ? That is where most of us are wrong ... some wrote about infections in lung but that is totally wrong according to google and wikipedia.According to them a hole in thoracic cavity leads a disease called "PneumoThorax" in which air enters the thoracic cavity and builds up a pressure which prevents lungs from expanding.As a result there is difficulty in breathing.Now i dont know if anyone has written it but i did mention pressure changes in my answer.Some people have written that lungs will be punctured which will cause the alveoli to burst , decreasing surface area of lungs and causing breathing problem.Again even that is wrong according to wikipedia , a punctured lung does not lead to bursted alveoli instead it causes lungs to collapse as air leaks out of lungs into thoracic cavity which makes it unable to expand and cause it to collapse ... What are your views guyz ?