explained Inflorescence and its types 11th, biology

1. INFLORESCENCE & ITS
TYPES
BY NILIMA PATIL

2. Inflorescence
Def.-- The pattern of flower arrangement on the
floral axis is known as inflorescence
or
An inflorescence is an arrangement of one or
more flowers on a floral axis(peduncle)
Parts of inflorescence –
1)Flowers
2)Peduncle(stalk of inflo.)
.

3. Types of inflorescence:
. Inflorescence is divided into two main types:
An inflorescence may either be
of racemose or cymose types.

4. Racemose or Indefinite or
Indeterminate Type of Inflorescence:--
1) Flowers are present in the acropetal
succession i.e. Younger flowers are
present at the tip while older flowers are
arranged at the base of this inflorescence.
This type of arrangement is known as
centripetal
2)The main axis in racemose inflorescence
continues to grow/with indefinite growth
and produce flowers laterally./axillary in an
acropetal order -i.e. youngest flower at
apex and older at base

5. Cymose or Definite or Determinate
Type of Inflorescence The cymose
inflorescence is characterised by the presence of a
flower at the apex of the flower axis
1)Flowers are present in the basipetal succession,
i.e. older flower is present terminally and the
younger ones at the base. This type of arrangement
is known as centrifugal with the older flowers
present in the middle and the younger ones at the
periphery
2)The growth of the main axis is limited and the
lateral axis also terminates into flower and that
limits the growth of the axis

8. S.No
.
Cymose Racemose
1. The main axis terminates in a
flower and has definite growth
The main axis continues to grow
indefinitely
2. Peduncle shows sympodial or
multipodial growth
Peduncle shows a monopodial growth
3. The flower is present apically in
basipetal succession
The flowers are present laterally in
acropetal succession
4. The arrangement of flowers is
centrifugal
The arrangement of flowers is
centripetal
5. The grouping of flowers is more
common
The grouping of flowers is less
common
6. The first formed flower is at the tip
of peduncle
The first formed flower is at the base
of the peduncle
7. The number of flowers is definite The formation of flowers is indefinite
or unrestricted
8. Flowers bloom at a long interval Flowers bloom at a short interval
9. Newly formed fruits are protected
by flowers
Newly formed fruits are not protected
by flowers