"Sexual Reproduction of Plants" PPT download

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"Sexual Reproduction of Plants" PPT download

Part One: Introduction of New Course

When the plant grows to a certain stage, buds and flowers will appear. After pollination and fertilization, the flowers develop into fruits and seeds. Flowers, fruits and seeds are the reproductive organs of the plant. How do plants reproduce and develop?

learning target

1. Explain the relationship between flower structure and fruit development.

2. Give an example of the structural characteristics of fruits or seeds that are suitable for propagation.

Sexual reproduction of plants PPT, part 2: formation of fruits and seeds

Changes in flower parts

After fertilization is completed, the ______, petals, ______, and the stigma and style of the pistil will generally wither, and only the ______ of the pistil will continue to develop into ______.

Which part of the ovary develops each part of the fruit structure?

think about it

What is the answer to the riddle "Hemp house, red tent, and a fat white man living inside"? What do "hemp house", "red tent" and "white fat man" mean respectively?

Plants such as peaches and plums have only one ovule in each ovary, so each fruit has only one seed.

Plants such as watermelons, tomatoes, and broad beans have multiple ovules in each ovary, so each fruit has multiple seeds.

The number of seeds a fruit contains is related to the number and development of ovules in the ovary.

Sexual reproduction of plants PPT, part 3: dispersal of fruits and seeds

structures in fruits or seeds adapted to dispersal

Purpose of study: To explore the structure of fruits and seeds adapted to dispersal.

Recommended equipment: ripe fruits, blades, dissecting scissors, etc.

Inquiry Guide:

1. Students work in groups of 4 to explore the fruits or seeds of the plants they bring, and raise questions about the structure of the fruits or seeds of plants adapted to propagation.

2. Group discussion, based on the structure of the two fruits or seeds, put forward the hypothesis that the structure of the fruit or seeds is adapted to spread.

3. Through dissection, experiments and other methods, collect hypotheses on how the structure of plant fruits or seeds is adapted to propagation.

4. Write a research report on "The Mystery of Fruit or Seed Dispersal of Plants". Each group will try to report the research results with pictures and texts.

Sexual Reproduction of Plants PPT, Part 4: Class Summary

Summary: Methods of fruit and seed dispersal

wind propagation

Some plants use wind to move their seeds elsewhere. Like dandelion fruit.

hydro propagation

Through water power, plant seeds can be spread. Such as Hainan Island coconut.

ejection propagation

In summer and autumn, when the fruits of some plants mature and crack, the peel curls inward and the seeds can be ejected. Such as soybean, rapeseed, and melon seeds.

The melon is native to southern Europe. When mature, the pulpy tissue containing the seeds turns into a viscous liquid that crowds the inside of the fruit and strongly swells the peel.

Sexual Reproduction of Plants PPT, Part 5: Feedback in class

1. Each part of the plant fruit is developed from the corresponding part of the flower. Please fill in the following flower structure codes into the spaces in the table below according to the relationship between them.

A. Stamens B. Petals C. Fertilized egg D. Integument

E. Ovule F. Ovary G. Ovary wall

2. Plant fruits and seeds generally have structures adapted to propagation. Among the following descriptions, which one is wrong ( )

A. Coconut fruits can float in the sea and be washed to suitable coasts by waves.

B. The dandelion fruit has umbrella-shaped fine hairs that can fall everywhere like a parachute.

C. Squirrels eat pine cones, and the undigested seeds are carried into the moist environment with their feces.

D. There are hooks on the surface of soybean fruits, which is conducive to the spread of seeds.

Keywords: Jiangsu Education Edition eighth grade biology PPT courseware for the second volume free download, sexual reproduction of plants PPT courseware, .PPT format;

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"Sexual Reproduction of Plants" PPT courseware:

"Sexual Reproduction of Plants" PPT courseware Part 1: New lesson introduction Think about it 1. Among the various parts of a flower, which part is the main part? Pistils and stamens. 2. After a plant blooms and before it forms fruits and seeds, what two important physiological processes does it need to go through...

"Sexual Reproduction of Plants" PPT:

"Sexual Reproduction of Plants" PPT Part 1: Examination Exercises 1. Which of the following is asexual reproduction of organisms ( ) A. A person is pregnant for ten months and gives birth once. B. Spring flowers and autumn fruits of angiosperms C. Birds lay eggs and hatch them D. Cuttings and...

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Update Time: 2024-11-24

This template belongs to biology courseware Jiangsu Education Edition 8th Grade Biology Volume 2 industry PPT template

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