sexual & asexual reproduction lesson 1. sexual reproduction in plants importance of sexual...

Sexual & Asexual reproduction

Lesson 1

Lesson 1Sexual reproduction in plants Importance of sexual

reproduction

Reproduction

• All living things can reproduce• They produce

offspring similar to themselves.

ReproductionThere 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 CompletePart of Flower Function

Ovary

Female gamete

Anther Makes 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