Plants Lifecycles - Asexual reproduction...Plants Lifecycles Asexual reproduction 3 Week 6 Sexual reproduction: - Involves 2 parent plants - Reproduction in flowering plants is a 4

Plants Lifecycles Asexual reproduction

1

Week 6

LI:To understand the process of asexual reproduction in plants and identify different types of asexual reproduction

Success Criteria: • I know the difference between sexual and asexual reproduction. • I can describe how plants reproduce asexually.


2

Week 6

Key vocabularyReproduce To produce another living thing of the same kind.Asexual A type of reproduction where new plants come from a single parent plant.Parent The original plant, from which others reproduce.Tuber A swollen, fleshy underground stem of a plant, bearing buds from which new plant shoots arise, eg potatoes.Bulb An underground food store, able to grow into a new plant, eg onions. Runner Horizontal stems, eg strawberry plants.Genetic Information Genes carry information that control the characteristics inherited from an organism's (in this case, a plant's) parents.Identical Exactly the same.Clone A copy - it has exactly the same DNA as the original living thing.


3

Week 6

Sexual reproduction:- Involves 2 parent plants

- Reproduction in flowering plants is a 4 step process: pollinationfertilisation,dispersalgermination.

What you can remember about the life cycle of flowering plants and the parts of the flower?


4

Week 6

• What do you think asexual reproduction is?

• How do you think it differs from sexual reproduction?


5

Week 6

Asexual reproduction needs only one parent plant, unlike sexual reproduction, which needs two parents.

Since there is only one parent, there is no mixing of genetic information.

As a result, the offspring are genetically identical to the parent and to each other. They are clones.


6

Week 6

When flowering plants sexually reproduce, the male parts of a plant and the female egg come together to make a new seed, which then grows into a plant.

BUT...some plants can reproduce asexually all by themselves!

When plants reproduce asexually, only one parentplant is needed. It can produce a new plant all by itself.


7

Week 6

Sexual reproduction Asexual reproduction

Need 2 plants

The pollen from the male parts of the flower is carried to the female part of the flower

This creates a new plant with its own genetic information

The new plant is identical to its parent

Only needs 1 parent plant


8

Week 6

This strawberry plant has grown a runner with three new plantlets.

Some plants reproduce asexually by producing side branches or shoots (called runners) carrying new ‘plantlets‛ on the ends. These runners grow away from the plant; the new plantlet grows into the soil.


9

Week 6

Types of asexual reproduction

Runners

Bulbs

Tubers


10

Week 6

Runners


11

Week 6

Some plants, such as crocuses and potatoes, grow stores of food under the ground called bulbs and tubers. These types of plant reproduce asexually by growing new plants off their bulbs and tubers.

Bulbs eg tulips, daffodils, onions

Tubers eg potatoes


12

Week 6


13

Week 6


14

Week 6

A swollen, fleshy underground stem of a plant, bearing buds from which new plant shoots grow. New tubers form beneath the ground.

Shoots

Tiny scale leaf, from which buds & shoots can grow -- on potatoes,they are called eyes

Tubers


15

Week 6

Tubers


16

Week 6

So we have looked at:

TubersRunners Bulbs

Can you remember some of the plants that produce these?

Next we are going to categorise them into groups.


17

Week 6

These are examples of classification keys:

Classification keys: A key is a set of questions about the characteristics of living things. You can use a key to identify a living thing or decide which group it belongs to by answering the questions.


18

Week 6

Task:To produce a key to help identify different plants that reproduce asexually.

Categorise the different plants so your key is easy to follow for someone who doesn't know the plant.

You will need:• A set of pictures and information • Paper and Pencil / Pen• Scissors• Glue


19

Week 6

artichokes Add picture and information

• Draw your classification key on paper (landscape).• Label the headings (Choose categories to complete empty boxes).• Use the information on the separate sheet to work out how to categorise the different plants.• Stick or draw the pictures and information in the correct place on your key.

For example:Draw and complete the key, using yourinformation

Flower Vegetable Above ground

Plants that reproduce asexually

Runners Bulbs Tubers


20

Week 6

Challenge: Write a paragraph comparing two plants that reproduce asexually. Use the photo cards and your key to help you, and remember to use scientific language....... Reproduce

AsexualParentTuberBulbRunnerGenetic informationCloneIdentical

Runners

Bulbs

Tubers


21

Week 6

Did you know that humans are involved in plant reproduction too? Clones of parent plants can be made by taking cuttings and growing new plants from them.

This gardener is preparing lavender cuttings for planting. They will grow into new plants which are clones of their parent plant.

Plenary

Documents

Plants Lifecycles - Asexual reproduction...Plants Lifecycles Asexual reproduction 3 Week 6 Sexual reproduction: - Involves 2 parent plants - Reproduction in flowering plants is a 4