HOW PLANTS GROW

TWO PHASES IN THE LIFE CYCLE OF A

PLANT

VEGETATIVE STAGE- includes the growth

of roots, stems, and leaves.

REPRODUCTIVE STAGE- the development of

flowers, fruits and seeds take place.

THREE ESSENTIAL CONDITIONS FOR

GERMINATION

1.Amount of moisture - which is needed to soften the seed coat and to help in the circulation of food which the seed contains.

2.Oxygen - which when moisture is absorbed, oxygen takes in and carbon dioxide is given off by the seed.

3.Warmth and air in the soil - needed to germinate seeds like melon, corn beans, cucumber and tomatoes that’s why they are planted at the onset of dry season.

MELON

CORN

BEANS

Cucumber

TOMATOES

THE REPRODUCTIVE STAGE

A new stage in a plant life that begins production of flowers and ends with maturing of seeds. It is made up of organs like sepals, stamens, pistils,

and petals.

Hypocotyls - the part of the embryo that first

grows downward into the soil forms the stem of the seedling

Epicotyls - the young leaves of the new plant

Development of a seed

seed

embryo

hypocotyl

epicotyl

ORGANS IN PRODUCTION OF

SEED

Pistils –are the female partof the flower whichconsists of an ovarywith an upright

extension.

Stamens – compose the male parts of the flower, each of which consists of a supporting filament and an anther where the pollen grain is produced.

Stigma-which lies on top ofthe style serves asthe pollen-receptivesurface.

Pollination- a process in which fertilization

takes place when a male nucleus in the pollen tube unites with the female nucleus of the ovule.

stigma sepals

petals

stigma

sepalfilament

ACTIVITY