"Diversity of Plant Reproductive Modes" PPT courseware

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"Diversity of Plant Reproductive Modes" PPT courseware

Part One: Knowledge Review

1. The concept of pollination

2. Briefly describe the two methods of pollination

3. Briefly describe the characteristics of insect-pollinated flowers and wind-pollinated flowers

4. Briefly describe the fertilization process of angiosperms

5. Development process of ovary

6. There are two peanut kernels in one segment of peanut. How many ovaries and how many ovules are they developed from?

We often use "hemp house, red tent, and a fat white man living inside" to describe peanuts.

What do the "hemp house, red tent, and white fat man" refer to respectively? How did they develop?

The hemp house is the pericarp, which develops from the ovary wall.

The red tent is the seed coat, which develops from the integument.

White fat man is the embryo of peanut, which develops from fertilized egg.

Diversity of plant reproductive methods PPT, Part 2: Asexual reproduction of plants

Spore reproduction in ferns, bryophytes, and algae

vegetative reproduction

Reproduction using vegetative organs (roots, stems, leaves) is called vegetative reproduction.

Example: propagation by roots: sweet potato; propagation by stems: potatoes; propagation by leaves: rooting on the ground

Types of vegetative reproduction:

There are four types: root division, layering, cutting and grafting.

Diversity of plant reproductive methods PPT, part 3: tissue culture

Tissue culture is also a method of vegetative propagation of plants. It can use the tissue or even a cell of a plant, under sterile conditions, on a medium containing comprehensive nutrients to cultivate a new individual that is basically the same as the original plant.

In addition to the ability of new individuals to maintain the excellent traits of their parents, tissue culture also has the characteristics of high parent utilization. It can use the tissues or cells of one plant to propagate a large number of identical plants, and the adaptability of tissue culture is wider than vegetative propagation. Woody Both plants and herbs can be tissue cultured. Therefore, tissue culture has been widely used in floriculture and horticulture.

Diversity of plant reproductive modes PPT, Part 4: Practice

1. There are peach blossoms of various colors in the park. If you want to bloom peach blossoms of various colors on a peach tree, the following methods are feasible: ( )

A． Root division B. Layering

C. Grafting D. Cuttings

2. The advantages of vegetative reproduction are ( )

A． Can increase crop yield

B. Future generations will have more flowers and fruits

C. Offspring have characteristics of both parents

D. Can speed up reproduction and maintain the excellent traits of parents

3. The picture shows two different reproduction methods of plants. Please answer the questions according to the picture:

(1) The asexual reproduction method shown in Figure ① is _____.

(2) The key step in Figure ① is to ensure that the _____ of parts a and b are closely combined. If the genetic composition of part a in the figure is DD and the genetic composition of part b is dd, the genetic composition of the peel that will produce fruit in the future is _____.

(3) Figure ② shows the _____ process of sexual reproduction in higher plants. In this process, the fertilized egg formed by the combination of c and d will develop into a seed _____.

Keywords: Zhejiang Education Edition seventh grade science PPT courseware for the second volume free download, diversity of plant reproductive modes PPT download, .PPT format;

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"Diversity of Plant Reproductive Modes" PPT:

"Diversity of Plant Reproductive Modes" PPT Part One Content: 1. Flowering and Pollination After the flower opens, the anthers of the stamens burst, the pollen is scattered and falls on the stigma of the pistil. This process is called pollination. Self-pollination: The pollen grains produced by the stamens of a flower fall on...

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Update Time: 2024-11-23

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 2 industry PPT template

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