Urgent Biology Q!! - Exam tomorrow - v Quick!!

Watch
This discussion is closed.
Asphyxiating
Badges: 2
Rep:
?
#1
Report Thread starter 15 years ago
#1
Pyramid of biomass..mass of organisms in each level of a food chain at a specific time, in a given area. ok so how come in my revision book there is a normal pyramid shape of biomass with

hawk (v small rectangle)
blue tit (small rect)
ladybird (middle size rect)
aphid (bigger rect)
oak tree (v large rect)

in that order? surely ladybirds have less biomass than a hawk?? Thanks
0
tis_me_lord
Badges: 14
#2
Report 15 years ago
#2
Maybe it's the combined weight of them all...? There's more ladybirds than hawks.
0
Asphyxiating
Badges: 2
Rep:
?
#3
Report Thread starter 15 years ago
#3
(Original post by tis_me_lord)
Maybe it's the combined weight of them all...? There's more ladybirds than hawks.
I thought only pyramid of numbers accounted for numbers though, is it not the biomass of one organism?
0
stylish_riot
Badges: 0
#4
Report 15 years ago
#4
Hiya,
I haven't done Biology for a while but I reckon...
Individually, yes, one ladybird has a much less bio-mass than a hawk. But in that food chain, there may only be one hawk, but a whole load of ladybirds, so collectively, the ladybirds have a larger biomass than the one hawk. There may only be one tree as well, but that obviously has a bigger bio-mass than any of the others cos it's so huge.

I think that's right. Good luck with your exam.
0
Asphyxiating
Badges: 2
Rep:
?
#5
Report Thread starter 15 years ago
#5
Ok thank you all so much for your posts! Thanks so much for trying to help! I think i thought the pyramid was irrespective of numbers but I think you're right, thanks
0
X
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

If you do not get the A-level grades you want this summer, what is your likely next step?

Take autumn exams (125)
46.99%
Take exams next summer (37)
13.91%
Change uni choice through clearing (68)
25.56%
Apply to uni next year instead (24)
9.02%
I'm not applying to university (12)
4.51%

Watched Threads

View All