SEXUAL REPRODUCTION IN PLANTS NATURAL SCIENCE 2nd ESO Sagrat 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 …………

PISTILFemale reproductive organ of the flower. CALYXConsists of all the sepals, which protect the flower before it opens. COROLLAConsists of all the petals, which serve to attract pollinators through colour and scent. FILAMENTA stalk that supports the anther. ANTHERWhere the pollen is produced. STIGMAReceives the pollen from the anther. PEDICEL Supports the plant and connects it to the stem. OVARYWhere the ovules are. STAMENMale reproductive organ of the flower. POLLINATIONPollen moves from a flower to another flower, from the anther of one flower to the stigma of another. Activity 1:

POLLINATION

Pollination It is the process by which pollen grains, found in the flower’s stamens, reach the pistil. PISTIL STAMEN

TYPES OF POLLINATION 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

 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.