A level Biology: Post your doubts here!

[fantastic girl]

Aoa guys
can someone give me a proper answer for Q1 c part ?
http://studentbounty.com/pastpapers/Cambridge International Examinations (CIE)/International AS and A Level/Biology (9700)/2012 Jun/9700_s12_qp_52.pdf

Can anyone give me the answer plz? :/

 

[ashcull14]

multiply the given values
they hve given energy value for per unit mass so u multiply wid the total biomass
for eg :
R- 1x0.1 =0.1
0.1 is for one individual nd the total individuals in R is 10 000
so 0.1x10000 =1000
S- 100
T- 1.8
U- 450000
So the order is U-R-S-T
hope u got it!

GOT IT THNK u SOO much

 

[ashcull14]

 

[fantastic girl]

GOT IT THNK u SOO much

Mention not xD

 

[qwertypoiu]

View attachment 52471
please explain ?????

Ah I understand now. Whenever there is energy flow in the food chain, it must be lost at every trophic level. So we must find, for every species, the total energy they have at that specific trophic level; the ones with the highest are first ones in the chain (eg. plants and herbivores) and the lower ones are further along the chain (eg. carnivores and predators).
For every specie, we know the following:

• number of individuals
• biomass of ONE such individual
• energy value per unit biomass

To find total energy in the species, we must multiply all these, because:
Total biomass = no. of individuals x biomass of ONE individual
Total energy = Total biomass x energy per biomass = (no. of individuals x biomass of ONE individual) x energy per biomass
So multiply all three columns for each:

R has 1000 units of energy
S has 100 units of energy
T has 1.8 units of energy
U has 450,000 units of energy.
So:
U>R>S>T
therefore:
U-->R-->S-->T

 

[qwertypoiu]

Oops, sorry didn't see it was already answered

 

[ashcull14]

how?

 

[fantastic girl]

View attachment 52479

D ?

 

[ashcull14]

D ?

yes how??

 

[fantastic girl]

how?

read the notes
B lymphocytes are always involved in humoral immunity

 

[My Name]

how?

hehe sorry I deleted my post....because I wasnt sure I think it is D

 

[qwertypoiu]

Umm if somebody answers that question plz explain what this cell mediation thingy is.
And also humorous response????

 

[ashcull14]

hehe sorry I deleted my post....because I wasnt sure I think it is D

its k u wer ryt nd shud confident bout it

 

[fantastic girl]

hehe sorry I deleted my post....because I wasnt sure I think it is D

i will complain to Miss tomorrow

 

[My Name]

i will complain to Miss tomorrow

Sure, go ahead.
It is actually my fault I wasn't paying attention in class when she explained this part.
BUT hey right answer!

 

[My Name]

Umm if somebody answers that question plz explain what this cell mediation thingy is.
And also humorous response????

how?

After I finish studying (this part completely) I'll try to explain.

 

[fantastic girl]

Sure, go ahead.
It is actually mt faultI wasn't paying attention in class when she explained this part.
BUT hey right answer!

as u say moon
i never paid attention for AS nd now m suffering wid AS

 

[My Name]

as u say moon
i never paid attention for AS nd now m suffering wid AS

Ahaha XD I can pretend I'm attentive very well!
That seems very unlikely!

 

[fantastic girl]

Umm if somebody answers that question plz explain what this cell mediation thingy is.
And also humorous response????

Cell-mediated immunity is an immune response that does not involve antibodies, but rather involves the activation of phagocytes, antigen-specific cytotoxic T-lymphocytes, and the release of various cytokines in response to an antigen.
Humoral involves antibodies as B cells form plasma cells nd they secrete antibodies.

 

[My Name]

qwertypoiu ashcull14
http://www.s-cool.co.uk/a-level/biology/immunity/revise-it/the-third-line-of-defence
how about we read this for now