HOW DO PLANTS GROW, DEVELOP AND REPRODUCE?

CHAPTER 2: LESSON 2:

Parts of the plant

Flower

Stem

Leaves

Roots

Needs of plants

Water Sunlight NutrientsCarbon dioxide

Functions of Parts of the plant

1) Anchors the plant in the soil.2)The roots takes water and nutrients from the soil.

The stem takes water and nutrients from the roots.The Leaf takes water and nutrients (from stem) and sunlight and carbon dioxide (from the air) to make the plants food.

The flower forms seeds and fruits.(production of new plants)

PARTS OF A FLOWER

Sepal

Petal

Receptacle

Anther

Filament

Stamen

Stigma

StyleOvar

y

Pistil

Ovule

Egg

SepalProtects the bud.

PetalBrightly coloured to attract insects.

AntherFilament

StamenThe male

part of the flower. (The anther produces pollen)

Stigma(Sticky surface

to catch the pollen)

Style(Tube)

Ovary(Tube)

Pistil(The

female part of

the flower)

Pollination

(The transfer of pollen from

stamen to pistil)

Ways of Pollination

By insects or birds

By wind

Pollination by insects or birds

Nectar (sweet liquid), colourful petals and scent attract the insect and birds

Pollen sticks to their body.

When pollinator goes to another flower the pollen sticks to the pistil.

Types of Pollination

Self pollination

Cross pollination

The male pollinates the female of the same flower.

The male pollinates the female of another flower.

What happens after Pollination?

A pollen tube grows from the pollen to the egg.The pollen enters the egg (FERTILISATION)

What happens after fertilisation?

A pollen tube grows from the pollen to the egg.The pollen enters the egg (FERTILISATION)

Structure of seed

Baby plant

Protects the seed

Stores food for embryo.