asexual reproduction interest grabber rooting for a plant people who have gardens or houseplants...

Asexual Reproduction

Interest Grabber

•Rooting for a Plant

•People who have gardens or houseplants often grow extra plants by making cuttings—leafy stem pieces or small sprigs of plants—that are then partially buried in soil or in a special rooting mixture to “root.” In this process, the cut stems develop roots. When the roots are large enough, the cutting is potted or put into the ground, where it grows into a complete plant. This process works well with many plants, including begonias, geraniums, coleus, African violets, forsythia, and willow.

Section 24-3


Interest Grabber continued

• 1. For a gardener, what might be an advantage of growing plants from cuttings rather than from seeds?

• 2. Herbaceous plants, such as coleus, root faster than do woody plants, such as willow. How would you explain this difference?

• 3. How would plants grown from cuttings compare to the plant from which the cuttings were taken? Why would this be an advantage for a gardener?

Section 24-3


Section Outline

• 24–3 Plant Propagation and AgricultureA. Vegetative Reproduction

B. Plant Propagation

1. Cuttings

2. Grafting and Budding

C. Agriculture

1. Worldwide Patterns of Agriculture

2. Changes in Agriculture

Section 24-3


Comparing Plant Propagation MethodsComparing Plant Propagation Methods

Section 24-1

Method Procedure

Compare/Contrast Table

A length of stem that includes lateral buds is cut from the parent plant and partially buried in soil or rooting mixture to take root.

A piece of stem is cut from the parent plant and attached to another plant.

A piece of lateral bud is cut from the parent plant and attached to another plant.

Grafting

Budding

Cuttings


KEY CONCEPT Plants can produce genetic clones of themselves through asexual reproduction.


Plants can reproduce asexually with stems, leaves, or roots. • Asexual reproduction allows a plant to make copies of itself.• Regeneration is one type of asexual reproduction.

– plants grow a new individual from fragment of parent – occurs when piece of a stem, leaf, or root falls off parent

plant


– stems, leaves, or roots attached to parent plant produce new individuals

– specific adaptations include stolons, rhizomes, and tubers

• Vegetative reproduction is another type of asexual reproduction.


Humans can produce plants with desirable traits using vegetative structures. • Vegetative propagation takes advantage of plants’ ability to

reproduce asexually. • Humans use one plant with desirable traits to produce

many individuals.

– grafting joins the parts of two plants together to form

a hybrid plant

– cutting of leaves or stems may grow new roots

asexual reproduction interest grabber rooting for a plant people who have gardens or houseplants...

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