Question

Tema
Hath
Uns
Northem were measual Pame
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bottle guard, cover with a polythene bag
Collect pistil and fruit of cucumber, bhendi
adies linger), cotton and beans and do the loosely tying the bag on a stalk. Make some
tiny holes in the bag with the help of a pin.
above activity. Write your observacions. What
smilarities do you see between the ovary and
species?
Two days later observe the buds blooming
fruit of the same
to conclude that an ovary
(Now collect the pollen grains from a male
flower of the Bottle gourd plant). Pluck the
develops into a fruit while the ovules develop
stamens of male flower and shake to collect
into seeds. The seeds further produce new pollen grain in a sheet of paper. Twisting cotton
wool over the tip of a match stick prepares a
Agents that help ovary of flower to
brush. Now uncover five of the ten female
flowers. Apply the pollen grains on to the stigma
of these flowers with the brush. The pollen grains
a bottle gourd plant in a garden. It
stick to the stigma. Cover the flowers again with
polythene bag Remove all male flowers from
has unisexual flowers ie, male and female the plant. So that no pollen grain reaches the
flowers separately. Select 10 female buds of remaining female flowers.
plants
NG
develop into fruit
Let us do -4
Observe
Sexual
parts
of flower
Now take a stamen (androecium) from the
china rose flouer, tap the stamen gently on a
slide. You can see some grains fallen on the
slide. Put a drop of water and observe these
grains under the microscope
parts. What do
Fig. 10
ovary of
Fig. 10b
Fig 10c
them
section
Fig. 8b LS of our
Fig Sa TS of ovary
With the help of hand lens study the interne
see? Some small ball
you
structures called 'ovules"
can be see
arranged in different chambers.
Now take pistils of other flowers as wello,
by one, and cut the
observe. Draw the diagram of the
that you have observed
ovary
Flower part to Frult
Lerne de:
Collect a pistil and fruit from datura plant
These grains are called pollen grains Collect
Cut the transverse section of both ovary
pollen grains from other flowers and observe
pistil and fruit. Observe the internal structur:
under the microscope as well. Are all these of
of both the section cuttings with the help of
same shape and colour? Draw the different
pollen grains as you see them under the
hand lens. Are there any similarities between
microscope
these hvo?
Take the pistil of a datura flower as it is big
w
nough to observe the internal parts.
in the sections of the ovary of pistil as
Fig. 9 T.S of
own in figures Sa and Sb.
Fruit of Datura
Fig. 7
The transfer of pollen grains from another to If transfer of pollen grains take place within
stigma known as pollination.
the flower it is known as Self Pollination.
After one week observe both pollinated and
Transfer of pollen grain from one flower to
non-pollinated flowers. Pollinated flowers
stigma of another flower of same species in
develop into fruits where as non-pollinated
called Cross Pollination.
flowers do not
Agents of Pollination:
Why is it necessary to begin this
How do these pollen grains fall on the stign
experiment with buds in which sepals are
Air, water, animals, insects, humans act
closed?
agents of pollination. They carry pollen gr
Why are the buds enclosed in polythene
from anther to the stigma. Insects
bags?
butterflies suck nectar from flowers. At
Why are the non-pollinated flowers also
time pollen grains of that flower stick
covered with polythene bags?
legs of the butterfly. When the butterfly
By this experiment we come to know that to another flower for nectar, the poller
significant role is played by male flower in the that have stuck to it's legs fall on that
formation of fruit.
OB
Reproduction in​

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