Pla
GROWTH AND DEVELOPME
INTRODUCTION
All cells of a plant are
During this process a
descendents of the zygote Development is the sum complex body organisation
Development of a mature of two processes: is formed that produce roots
plant from a zygote follows GROWTH & DIFFERENTIATION leaves, branches, flowers,
a precise and highly
fruits, seeds and eventually
ordered succession of
they die
events
H Y S I
P
Growth is irreversible permanent
a
increase in size of an organ or its
parts or even an individual cell.
It is one of the most fundamental
A L L
W
and conspicuous characteristic
GROWTH
of a living being
Growth is accompanied by metabolic
processes and occur at the expense of energy
Plants retain the capacity of unlimited growth
throughout their life due to presence of
meristem at certain locations in their body.
Growth is measurable: At cellular level, it is principally a consequence of increase in amou
protoplasm It is measured by a variety of parameters like-increase in fresh weight, dry w
length, area, volume and cell number.
, GROWTH RATES
Increased growth per unit time Is termed as growth rate, it can be arithmet
Geometrical growth: In mos
Arithmetic growth: Following mitotic cell (lag phase), it increases rap
division, only one daughter cell continues to (lag or exponential phase),
divide while the other differentiates and division retain ability to divi
limited nutrient supply, grow
matures So. a linear curve is obtained e g.,
phase giving a typical sigm
root elongating at a constant rate
• A sigmoid curve is a chara
Mathematically, expressed as natural environment It is typ
of a plant.
Lt = L0 + rt
L0 = length at time ‘t’ The exponential gr
L = length at time ‘zero’ W1 = final size (wei
r = growth rate/elongation per unit lime. W0 = initial size at
r = growth rate, t =
Here, r = relative g
produce new mate
S I
QUANTITATIVE COMPARISONS BETWEEN
H Y
OF LIVING SYSTEM CAN BE MADE
P
Measurement and comparison of total growth per The growth of given sy
L
common basis, e g
L
unit time called ABSOLUTE GROWTH RATE
called REL
W A
GROWTH AND DEVELOPME
INTRODUCTION
All cells of a plant are
During this process a
descendents of the zygote Development is the sum complex body organisation
Development of a mature of two processes: is formed that produce roots
plant from a zygote follows GROWTH & DIFFERENTIATION leaves, branches, flowers,
a precise and highly
fruits, seeds and eventually
ordered succession of
they die
events
H Y S I
P
Growth is irreversible permanent
a
increase in size of an organ or its
parts or even an individual cell.
It is one of the most fundamental
A L L
W
and conspicuous characteristic
GROWTH
of a living being
Growth is accompanied by metabolic
processes and occur at the expense of energy
Plants retain the capacity of unlimited growth
throughout their life due to presence of
meristem at certain locations in their body.
Growth is measurable: At cellular level, it is principally a consequence of increase in amou
protoplasm It is measured by a variety of parameters like-increase in fresh weight, dry w
length, area, volume and cell number.
, GROWTH RATES
Increased growth per unit time Is termed as growth rate, it can be arithmet
Geometrical growth: In mos
Arithmetic growth: Following mitotic cell (lag phase), it increases rap
division, only one daughter cell continues to (lag or exponential phase),
divide while the other differentiates and division retain ability to divi
limited nutrient supply, grow
matures So. a linear curve is obtained e g.,
phase giving a typical sigm
root elongating at a constant rate
• A sigmoid curve is a chara
Mathematically, expressed as natural environment It is typ
of a plant.
Lt = L0 + rt
L0 = length at time ‘t’ The exponential gr
L = length at time ‘zero’ W1 = final size (wei
r = growth rate/elongation per unit lime. W0 = initial size at
r = growth rate, t =
Here, r = relative g
produce new mate
S I
QUANTITATIVE COMPARISONS BETWEEN
H Y
OF LIVING SYSTEM CAN BE MADE
P
Measurement and comparison of total growth per The growth of given sy
L
common basis, e g
L
unit time called ABSOLUTE GROWTH RATE
called REL
W A
