"Sexual Reproduction of Plants" PPT courseware

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"Sexual Reproduction of Plants" PPT courseware

Part One: Introduction of New Course

think about it

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

Pistils and stamens.

2. What two important physiological processes does a plant need to undergo after it blooms and before it forms fruits and seeds?

pollination and fertilization

learning target

1. Describe sexual reproduction in plants.

2. Outline the process of pollination and fertilization, and clarify the relationship between flowers, fruits and seeds.

Sexual reproduction of plants PPT, Part 2: Pollination and fertilization of plants

Pollination: After the plant blooms, the process in which the pollen in the stamen anthers is transferred to the pistil stigma through different channels is called pollination.

way of pollination

self-pollination

Pollen from the stamen anthers of the same flower is passed to the pistil. For example, peas and wheat are self-pollinating plants.

cross-pollination

Pollen from the stamens of one flower is transferred to the pistils of another flower. Plants such as apricots and apples are cross-pollinated.

Do you know about insect-pollinated flowers and wind-pollinated flowers?

Insect-pollinated flowers: The gorgeous corolla, fragrant floral fragrance, and sweet nectar attract insects, animals and other media to help complete pollination.

Wind-pollinated flowers: The pollen is abundant and light, and pollination is completed with the help of wind and other media.

Sexual reproduction of plants PPT, part three: discussion and analysis

1. In spring, there are often bees flying in the orchard. Is this good for the fruit trees?

Flowers bloom in the orchard in spring. Most of the flowers in the orchard are entomophilous flowers, attracting bees to collect pollen, thus helping to pollinate the fruit trees.

2. During the flowering season of fruit trees, if you encounter continuous rainy weather, the yield of fruit trees will often be reduced. What is the reason?

This is because the pollination of fruit trees is affected. For example, fruit trees that rely on insect pollination are restricted in their flight, so insufficient pollination results in reduced yields; fruit trees that rely on wind pollination also suffer from reduced yields due to rainy weather that prevents pollen from being spread by the wind.

Sexual reproduction of plants PPT, part 4: What is sexual reproduction?

Sexual reproduction: Generally refers to the reproductive method in which the germ cells of both sexes combine to form a fertilized egg, which then develops into a new individual.

In conclusion

1. Concept of fertilization:

The process in which plant sperm and egg cells combine to form fertilized eggs is called fertilization. The fertilized egg is the starting point of plant development.

2. Double fertilization:

One sperm combines with the egg cell to form a fertilized egg, and the other sperm combines with the two polar nuclei to form a fertilized polar nucleus, which is called double fertilization.

Double fertilization is a fertilization method unique to green flowering plants.

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

1. A green flowering plant generally must complete two main physiological activities to form fruits and seeds, which are ( ).

A. Flowering and pollination

B.Flowering and fertilization

C.Pollination and fertilization

D. Self-pollination and cross-pollination

2. When we eat corn ears, we often see missing kernels. The reason is ( ).

A. Lack of moisture B. Lack of sunlight

C. Lack of fertilizer D. Insufficient pollination

3. After pollen falls on the stigma ( ).

A. Germination of pollen tubes

B. Start cell division

C. Formation of two sperm

D. form a sperm

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

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"Sexual Reproduction of Plants" PPT download:

"Sexual Reproduction of Plants" PPT Download Part One: New Lesson Introduction When plants grow to a certain period, they will bud and bloom. 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...

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Update Time: 2024-10-22

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

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