"Plant Reproduction" Biological Reproduction and Development PPT Courseware 3

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"Plant Reproduction" Biological Reproduction and Development PPT Courseware 3

review:

What important processes does a plant go through from forming flower buds to bearing fruit?

What parts are flowers made of?

Among the parts of a flower, which part is the most important?

1. Sexual reproduction:

The embryo in the seed develops from the combination of reproductive cells of both sexes into a fertilized egg. This type of reproduction in which a fertilized egg develops into a new individual belongs to sexual reproduction.

discuss:

1. What do these plants have in common in their reproductive methods?

Answer: They all produce new individuals directly from the mother without going through the combination of reproductive cells of both sexes. (This method of reproduction is called asexual reproduction)

2. Plant reproduction methods are diverse. What does this mean for plants?

It has stronger adaptability to harsh environments; it is easier to continue its offspring in nature and avoid extinction.

2. Asexual reproduction:

Some plants produce new individuals directly from the mother without the union of sexual reproductive cells. This method of reproduction is called asexual reproduction.

summary:

What is sexual reproduction?

The process by which the reproductive cells of both sexes combine to form a fertilized egg, and the fertilized egg develops into a new individual.

What is asexual reproduction?

The process of developing directly from the mother into a new individual without the combination of reproductive cells of both sexes.

Methods of asexual reproduction:

Cuttings: sweet potato, grape, chrysanthemum, rose, etc.

Layering: oleander, osmanthus, jasmine, etc.

Grafting apples, peaches, pears, etc.

Advantages of asexual reproduction:

1. Save time;

2. Increase production;

3. Improve quality;

4. Innovative varieties.

Handling of cutting materials

1. Take a stem segment of a plant, usually leaving two nodes in each segment.

2 The cut above the stem segment is horizontal, while the cut below the stem segment is diagonal.

3. Remove part of the leaf from the upper node, and remove all the leaves from the lower node from the petiole. (The lower section needs to be buried in the soil when cutting.)

4 Generally, new roots will grow in 4-10 days after cutting, and transplanting can be done when new leaves grow; 7-8 new leaves will grow in 20-30 days, and harvest can be done at this time.

1. A discerning eye

1. The embryo in the seed develops from ( ).

A. Fertilized egg B. Fertilized polar nucleus C. Ovule D. egg cell

2. Among the following groups of plant reproduction, which group belongs to asexual reproduction ( )

① Sage relies on bee pollination to reproduce its offspring;

② Sow corn seeds and grow corn plants;

③Wheat reproduces by spreading pollen by wind;

④The buds on the potato tubers will sprout;

⑤The buds on the bamboo whip nodes can form bamboo shoots and then grow into new bamboo;

⑥The leaves of begonias send out buds and roots, and then grow new plants.

A. ①②③ B． ②③④ C. ③④⑤ D. ④⑤⑥

3. The part that can develop into fruits is ( )

A. Stamen B. Ovary C． Anthers D. fertilized egg

2. Look at the picture and fill in the blanks

Based on Figures 1 and 2, please answer the following questions.

1. Grafting includes two methods. The method shown in Figure 1 is _____, and the method shown in Figure 2 is _____.

2. The difference between the two grafting methods is that the scions are different. Figure 1 shows the use of _____ as the scion, and Figure 2 shows the use of _____ as the scion.

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For more information about the PPT courseware "Reproduction and Development of Organisms and Reproduction of Plants", please click the Reproduction and Development of Organisms ppt Reproduction of Plants ppt tag.

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Update Time: 2024-07-02

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 2 industry PPT template

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