Sexual & Asexual reproduction Lesson 1

 Sexual reproduction in plants  Importance of sexual reproduction

Reproduction All living things can reproduce They produce offspring similar to themselves.

Reproduction There are 2 types of reproduction: – Sexual reproduction – Asexual reproduction

Sexual Reproduction Most multicellular organisms use sexual reproduction to increase their numbers Sexual reproduction involves two parents, male and female, each producing sex cells from their sex organs

Sexual Reproduction: copy In sexual reproduction, two parents (male and female) produce offspring. The offspring are similar but not identical

Reproduction in Plants Flowering plants undergo sexual reproduction to produce seeds. The sex organs of a plant are found inside the flowers. They produce sex cells called gametes.

Gametes The seed is made when the male and female gametes FUSE. In plants- the MALE sex cell is called POLLEN and the FEMALE sex cell is called the OVULE. Both the male and female reproductive organs are found in the SAME PLANT

Parts of the Flower The STAMEN is the MALE part of the flower and is made up of the ANTHER and FILAMENT The ANTHER produces POLLEN grains The FILLAMENT holds the anther in place

Parts of the Flower The STIGMA is the FEMALE part of the plant. It is STICKY and catches pollen grains The OVARY contains the OVULES (the female sex cell).

Reproduction in Flowers: Copy In flowering plants, male and female reproductive organs are found in the same individual plant. Male gametes are found in pollen grains and produced in the anthers of the flower. Female gametes are found in ovules and produced in the ovary of the flower.

Label the flower diagram Petals Anther Ovule Stigma Style Ovary

Copy and Complete Part of FlowerFunction Ovary Female gamete AntherMakes pollen Pollen Stigma, Style and Ovary Female reproductive organs

Why is sexual reproduction important ?

The importance of sexual reproduction Sexual reproduction creates a variety of offspring Variation is important because it create individuals with new combination of genes Combinations of genes may give useful characteristics such as resistance to disease, tolerance to drought The more variation there is in a population the more likely it is to be able to be able to survive changes in the environment.

In your own words.. Explain the importance of sexual reproduction