"Plant Reproduction" Biological Reproduction and Development PPT Courseware

"Plant Reproduction" Biological Reproduction and Development PPT Courseware

clear goal

1. Be able to describe the concept and process of sexual reproduction in plants

2. Through observation, thinking and discussion, be able to list common asexual reproduction in plants

3. Through exploration activities, try plant cuttings

4. Understand the meaning of sexual reproduction and asexual reproduction through observation and comparative analysis

Thinking: At the Xiaolan Chrysanthemum Exhibition, there was a pot of the same chrysanthemum plant blooming with chrysanthemums of different colors and shapes (as shown in the picture). How did the agronomist make the same chrysanthemum plant bloom with different chrysanthemums?

What important processes does a plant go through from flowering to fruiting?

pollination and fertilization

Self-pollination: Pollen from the anthers of the stamens of the same flower is transferred to the pistils

Cross-pollination: the transfer of pollen from the stamen anthers of one flower to the pistils of another flower

The significance of various reproductive modes of plants

In production practice, people often use asexual reproduction of plants to cultivate crops and garden plants. Do you know why?

The significance of asexual reproduction: fast reproduction; short breeding time; maintaining the excellent traits of the parents.

The significance of sexual reproduction: Sexual reproduction allows offspring to possess the genes of both parents, produce mutations, and adapt to more complex environments, which is more evolutionary meaningful.

practice

1. When cutting potato tubers into small pieces for planting, does each piece need to have sprout eyes?

Every small piece should have a bud eye. Having a strong and plump bud is the key to successful reproduction. Buds can grow into new individuals. The buds synthesize strong auxin, which not only promotes plant growth, but also enhances the plant's disease resistance, which is also a prerequisite for successful reproduction. Small potato pieces without buds will rot quickly in the soil, making it difficult to achieve the purpose of propagation.

2. When planting chrysanthemums and aloe vera, one plant often turns into a clump. Can you explain this phenomenon? Will you divide them into many trees?

This is because they have strong sprouting ability. They can be propagated by dividing them.

3. Plant asexual reproduction is widely used in agricultural production. Can you give some examples? Are these plants also capable of sexual reproduction?

For example: for white potatoes, seedlings are grown first, and then cuttings are taken. Garlic, ginger, lotus root, water chestnuts, taro, etc. can also be propagated using underground stems. Yams can be propagated not only by rhizomes, but also by the "remnants" (bulbules) growing in the leaf axils. Most plants that reproduce asexually have the ability to reproduce sexually.

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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