SEXUAL REPRODUCTION

IN PLANTSNATURAL SCIENCE

2nd ESOSagrat Cor de Palma

PARTS OF A FLOWER

Do all plants reproduce in the same way?

Has a plant got reproductive organs?

How do plants reproduce?

EVERYTHING WE THINK WE KNOW ABOUT..

The flower is the reproductive organ of the most evolved plants.

FLOWER

PARTS OF A FLOWER

STAMENS: are the the flower’s male reproductive organs. They are made up of: Anther Filament

PISTIL: is the female reproductive organ. It is made up of: Stigma Style Ovary

COROLLA: Petals: attract pollinating animals.

CALYX: Sepals: protect the flower before it opens.

RECEPTACLE: is the part that other parts are attached. PEDICEL: supports the plant and connects it to the stem.

PARTS OF A FLOWER

In pairs or groups of three, read the definitions and suit them with the names of the parts of a plant. Use the following patterns.

Activity 1:

I think it is the ……….I think this is the …………

PISTIL Female reproductive organ of the flower.

CALYX Consists of all the sepals, which protect the flower before it opens.

COROLLA Consists of all the petals, which serve to attract pollinators through colour and scent.

FILAMENT A stalk that supports the anther.

ANTHER Where the pollen is produced.

STIGMA Receives the pollen from the anther.

PEDICEL Supports the plant and connects it to the stem.

OVARY Where the ovules are.

STAMEN Male reproductive organ of the flower.

POLLINATION

Pollen moves from a flower to another flower, from the anther of one flower to the stigma of another.

Activity 1:

POLLINATION

PollinationIt is the process by which pollen grains, found in the flower’s stamens, reach the pistil.

PISTIL

STAMEN

TYPES OF POLLINATIO

N

By animals and insects By the wind

BY ANIMALS AND INSECTS

Flowers are brightly coloured

They have a strong smell to

attract the insects

Pollen sticks to the insect’s

body

BY THE WIND

Flowers do not need to produce nectar, be brightly coloured or have a

pleasant smell

The pollen grains are usually very small and light

ACTIVITY 7

The flowers have a strong scent

The flowers are not brightly coloured

The flowers produce nectar

The flowers do not have a scent

The flowers have prominent anthes

The flowers have sticky pollen

The flowers are attractive

Write “insect pollination” or “wind pollination”

FERTILISATION

FERTILISATION

If the pollen grain deposited on the stigma is the right one for the species of flower, it produces the pollen tube.

The male gametes move down through this tube.

FERTILISATION

This tube grows down the style to reach the ovules in the ovary.

There, it meets the oosphere ( female gamete).

The fusion of a male gamete with the female gamete to form a zygote is called fertilisation.