Page 51 - Viva ICSE Science 5 : E-book

Process of pollination

Anther of a fl ower produces pollen grains, which contain male reproductive cells (called
gametes). These pollen grains may be carried by either wind, water or insect, and may

fall on the stigma of the same fl ower or another fl ower of the same kind. From stigma
they reach ovary through the style. Inside the ovary, male and female gametes meet and
reproduction takes place. It results in the formation of fruit from the ovary and seeds

from the ovules of a fl ower.

TIME TO REVISE

Write (T) for true and (F) for false statements.
1. Pollination is essential for a fl ower to form fruits and seeds.

2. Pollination is the process of transfer of pollen grains from the stigma
to the anther of a fl ower.
3. Fruit and seeds are formed from the ovules.

4. Pollen grains are male reproductive cells.

ACTIVITY TIME

To study the diff erent parts of a fl ower
You Need:
Hibiscus fl ower, a fi ne blade, a glass slide, a hand lens, a brush,
a compound microscope.
What to Do:

• Take the Hibiscus fl ower.
• Observe the fi ve green sepals.
• Remove the sepals carefully and observe the fi ve coloured
petals.
• Next remove the petals carefully. You will see a thin fi lament
called pistil.

• Observe the top of the pistil. You will see knob-like stigma.
• Stamens are present just below the stigma.
• Remove some stamens with the help of the brush. Place them on the glass slide and observe
under the microscope.
• Slit open the style from the base using the blade. Observe the ovary and ovules.
• Draw your observations.

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