B7.1 - OCR 21st century

Living organisms are interdependant. 

  • Ideas about energy in food chains
  • Pyramids of Biomass and numbers
  • Components of soil 
  • + some extra stuff 
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  • Created by: abbie
  • Created on: 14-06-11 11:45
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B7.1 ­ Living organisms are
interdependent.
Ani
ma l
s (
and humans)
can'
t
produce
thei
r
own
food.
Ther
efor
e,
w e
are
heterotrophs.
We r
ely
on ot
her
li
vi
ng
thi
n gs
to
produce
our
food
for
us.
As we humans can't make our own food (along with other animals) we are
heterotrophs because we depend on other living organisms to produce our
food.
Energy Transfer
I
n a
food
chai
n ener
gy
i
s transferred
bet
w een
each
trophic level.
For
exampl
e i
n t
he
food
chai
n:
Grass
Rabbi
t
Fox
To
carry
on t
he f
ood chai
n and t
he i
nit
ial
f
low of
ener
gy,
w hen
eit
her
of
the
organi
sms
di
e,
decomposers feed on t
he dead ani
ma l
or
droppi
ngs,
ther
efor
e t
he ener
gy
cont
inues
to
fl
ow
thr
ough out
t
he syst
em.
Energy
can al
so be
lost
at
t
his
part
due t
o t
he decomp oser
s si
mply
not
eati
ng
the
ent
ir
e
l
i
ving
o r
ganism.

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Pyramids of Biomass and Numbers
Usi
ng a
pyrami d di
agram t
o descr
ibe
the
organi
sms i
n a
food
chai
n can
be
usef
ul
to
see
rel
ati
onsh i
p s.
Ther
e ar
e
two
types
of
these
pyr
amids:
1)
Pyramid of Numbers
2)
Pyramid of Biomass
A Pyramid Of Numbers
shows
the
amount
of
or
gani
sms
invol
ved
in
each
tr
ophi
c l
evel
.…read more

Page 3

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Some ani
mals
ma y
be eat
en
quicker
t
han
they
are
repr
oduci
ng
or
vice
versa.
Efficiency can be calculated to show the efficiency of the energy
transfer in each trophic level.
eg)
i
n the
food
chai
n:
Rosebush (
80000kj
) G reenf
ly
(10000kj
) Ladybir
d (
900kj
)
Bir
d (
40kj
)
I
t
is
clear
t
hat
energy
is
lost
at
each
tr
ophic
level
.
We
use.
..…read more

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