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CCA Exam Questions And Answers

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What process causes a plant to fix nitrogen? - ANS Rhizobium bacteria infects plant root and forms nodule Legumes and Rhizobium bacteria have what kind of relationship? - ANS Symbiotic How much nitrogen does alfalfa fix? - ANS 250 How much nitrogen does sweet clover fix? - ANS ...

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  • July 26, 2024
  • 9
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

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  • Cca International
  • Cca International

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STUDYCLOCK
CCA
Exam
What
process
causes
a
plant
to
fix
nitrogen?
-
ANS
Rhizobium
bacteria
infects
plant
root
and
forms
nodule
Legumes
and
Rhizobium
bacteria
have
what
kind
of
relationship?
-
ANS
Symbiotic
How
much
nitrogen
does
alfalfa
fix?
-
ANS
250
How
much
nitrogen
does
sweet
clover
fix?
-
ANS
170
How
much
nitrogen
does
red
clover
fix?
-
ANS
150
How
much
nitrogen
does
soybean
fix?
-
ANS
100
How
much
nitrogen
does
hairy
vetch
fix?
-
ANS
70
How
much
nitrogen
do
field
peas
fix?
-
ANS
50
After
a
field
is
planted
with
a
legume,
a
grass
species
is
planted
such
as
corn,
grain
sorghum,
or
other
small
grains.
How
much
nitrogen
is
needed
for
a
credit
from
the
legume
species?
-
ANS
Half
of
what
it
fixes
annually
What
factors
limit
nitrogen
fixing
of
legumes?
-
ANS
Soil
pH,
Temp,
soil
aeration,
photosynthetic
rate,
soil
fertility,
high
nitrogen
in
soil
What
is
the
optimum
range
for
soil
pH
to
fix
the
most
Nitrogen?
-
ANS
5.5
to
7
What
is
the
optimum
range
for
temperature
to
fix
the
most
Nitrogen?
-
ANS
65
to
82
What
are
the
temp
limits
to
fixing
nitrogen?
-
ANS
32
to
112
Do
legumes
fix
more
nitrogen
with
sunny
or
cloudy
days?
-
ANS
Sunny
What
essential
element
is
most
essential
to
converting
elemental
nitrogen
to
ammonia
nitrogen?
-
ANS
Molybdenum
Nebraska
soil
normally
contains
enough
molybdenum
for
plants,
what
can
limit
this
and
how
can
it
be
fixed?
-
ANS
Acid
soils
and
liming STUDYCLOCK
How
does
high
nitrogen
affect
legumes?
-
ANS
Will
fix
less
nitrogen
Definition
of
a
physical
change
-
ANS
Change
from
solid
to
solution
Definition
of
a
chemical
change
-
ANS
change
from
one
ionic
form
to
another
Definition
of
a
biological
change
-
ANS
Change
by
soil
micor
organisms
Definition
of
Nitrification
-
ANS
micro
biological
changes
of
ammonium
nitrogen
to
nitrite
and
then
nitrate
Nitrite
salts
chemical
form
-
ANS
NO2
Nitrate
Salts
Chemical
Form
-
ANS
NO3
Ammonium
Salts
chemical
form
-
ANS
NH4
What
causes
the
first
step
in
Nitrification?
-
ANS
Nitrosomonas
and
Nitrosococus
bacteria
What
causes
the
second
step
of
Nitrification?
-
ANS
Nitrobacter
bacteria
What
environmental
conditions
are
the
best
for
nitrification?
-
ANS
80
to
90
degree
soils,
neutral
pH,
high
soil
moisture
but
with
adequate
oxygen
Definition
of
denitrification
-
ANS
the
conversion
of
nitrate
nitrogen
(NO3)
to
lesser
oxidized
forms
Why
does
denitrification
occur?
-
ANS
When
oxygen
is
limited,
soil
microbes
covert
more
Nitrate
to
N2
gas
so
that
they
can
get
oxygen
and
N2
can
be
lost
to
the
atmosphere
Denitrification
sequence
-
ANS
NO3
to
NO2
to
NO
to
N2O
to
N2
Chemical
formula
of
Nitrate
-
ANS
NO3
Chemical
formula
of
Nitrite
-
ANS
NO2
Chemical
formula
of
Nitric
Oxide
-
ANS
NO
Chemical
Formula
of
Nitrous
Oxide
-
ANS
N2O
Chemical
Formula
of
Nitrogen
gas
-
ANS
N2
What
soil
pH
is
denitrification
most
rapid?
-
ANS
7.5
to
8.5

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