Do Subscribe To Ekeeda Channel and press
bell icon to get updates about latest
Engineering, HSC and IIT-JEE Mains and
Advanced videos.Hello Students Today we
are studying chapter photosynthesis in
that we are studying topic C4
pathway how you can say c4 plants or H
escape pathway okay what is the
difference between plants that grow in
temperate environment - a temperate
environment it means dry environment if
then c3 cycle present or Calvin cycle
present why does the name of c4 cycle.
C4 plants when I say about c4 plants
and example of c4 plants would be
groggy Javar,bajra,milities basically
not this milities live each of our
Bastion they cruel in hot climatic
conditions then never require low
temperature they can grow at a
temperature above 40 degree Celsius
also and this plans up or less C4 plants
so what's so special about the c-4
plants c4 plants use c4 cycle now while
there was the need of c4 cycle if c3
cycle was already present of Calvin
cycle was called realism Calvin cycle
works at night them then Sun is mounted
so yc4 cycle
c4 comes basically our temperature power
when I said temperature tolerance they
grow in dry climatic conditions
c4 plants c4 plants are temperature
tolerant that does that second they lack
food to expiration thirdly they lack an
enzyme which is rubp Rubisco and we all
know for Calvin cycle to work
efficiently rubp is the first carbon
dioxide etc so our EVP is not present
inside this c4 plants
so obviously c3 cycle cannot work in
there and lastly there is multiple
layers of bundle sheath cells which adds
up to c4 cycle so how does he for cycle
work and what is the carbon dioxide
except the NC for cycle there is an
enzyme coalesce pep carboxylase and this
pep carboxylase is the first carbon
dioxide acceptor in c4 cycles remember
c3 cycle city cycle took place at night
that c4 cycle also takes place at night
time as in c3 cycle there were three
steps carboxylation reduction
regeneration similarly c po cycle works
and c4 cycle works on similar lines
somewhere here and there with some
molecules so let us see what are the
steps of c-4 cycle the first step is
carboxylation that is usage of co2 of
fixation of co2 with the help of enzyme
pep carboxylase the next step is
reduction reduction of Oh a that is
oxaloacetate acid and the third step is
reaction in bundle sheath cells as well
no c4 plants has a lot of bundle sheath
cells in Trabzon atom in the last step
pyruvate is formed which is a stable 3
carbon compound
now what c4 plants came into picture or
yc4 pathway was brought into picture c4
plants are basically temperature tall
that is they grow in dry climate a
condition the Sun is quite high in
benzene for plants other Auto millets
Java vajrayogini all our c4 plants
basically they lack photorespiration
that is respiration in the presence of
sunlight there is multiple layers of
bundle sheath cells present and then you
so know that then multiple layers of
butter sheet present there is difficulty
for moving in of molecules especially
rubp and lastly c4 plants lack rubp
answer which is ribulose biphosphate
enzyme so how the seafoam aqua actually
works we'll be studying that
civil party now see for back wave works
in three step the first step is
carboxylic that is fixation or usage of
co2 during carboxylation carbon dioxide
which is emitted out or which is present
in a lot of countries in the atmosphere
is accepted by PE PE that is false
foreign oil pile with acid and this PE
ba has more affinity for carbon dioxide
it can accept carbon dioxide even 50 ppm
along with water molecule in the
presence of enzyme phosphate on pyruvate
carboxylase a stable compound is formed
which is of sello acetic acid and this
axle of acetic acid is a full carbon
compound along with that h3po4 - s form
now this table full carbon compound goes
in the next reaction which is reduction
of away now NADPH - witches and
nicotinamide adenine dinucleotide
phosphate the ax width away in the
presence of enzyme dehydrogenase and the
Aldo dehydrogenase enzymes help in the
removal of hydrogen molecules in the in
the form of h plus 4 h - mallet is
formed and NADPH - gets reduced to nadp+
now this mallet is again a four carbon
compound
the last reaction of c-4 battery or co
cycle or c4 plants are reaction in by
the citizens during this reaction for
carbon malate stable compounds reacts
with mallard dehydrogenase which should
enclose the hydrogen molecules and forms
pyruvate a stable 3 carbon compound and
this pyruvate further reactions or it
further goes to different cycles
students in this part of the chapter we
have studied about c4 plants the
mechanism by which c4 plants actually
work and the pathway I hope you all are
clear with the c-4 part thank you
