"Sexual Reproduction of Plants" PPT

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"Sexual Reproduction of Plants" PPT

Part One: Checking Exercises

1. Which of the following is asexual reproduction of organisms ()

A. "A human being is pregnant for ten months and gives birth once."

B． "Spring flowers and autumn fruits" of angiosperms

C. Birds lay eggs, hatch

D. Cutting and grafting in production practice

2. In the reproductive circle, many organisms reproduce asexually. Which of the following descriptions of asexual reproduction methods is correct ()

A. Neither undergoes the union of reproductive cells of both sexes

B． Neither parent can produce germ cells

C. Reproduces slowly

D. The offspring cannot maintain the excellent qualities of their parents.

3. The essential difference between organisms that reproduce sexually and organisms that reproduce asexually is ()

A. Whether there are healthy offspring B. Is it hereditary?

C. There is no variability D. Is there a union of hermaphrodite germ cells?

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

Sexual reproduction of plants: generally refers to the reproductive method in which reproductive cells are produced by the parents, and through the combination of the reproductive cells of both sexes, they become fertilized eggs and then develop into new individuals.

Pollination: After a plant blooms, the pollen in the stamen anthers is transferred to the pistil stigma through different pathways.

cross-pollination

Entomophilous Flowers: Characteristics of Attracting Insects::

1. Pollen is light

2. Bright flowers

3. Sweet nectar

4. Aromatic taste

Wind-pollinated flowers: Characteristics of being able to fly in the wind:

1. Pollen is light, dry and abundant

2. The stigma is bifurcated or feathery, extending beyond the petals.

Sexual reproduction of plants PPT, Part 3: Fertilization process

Process: ①Pollen falls on the stigma

②Pollen begins to germinate under the stimulation of mucus on the stigma and grows pollen tubes

③The pollen tube passes through the style, enters the ovary, and reaches the ovule

④The sperm in the pollen tube moves downward as the pollen tube elongates, and finally enters the inside of the ovule

⑤ There is an egg cell inside the ovule, which combines with the sperm from the pollen tube to form a fertilized egg.

fertilization

Fertilized egg: When the pollen tube enters the ovule from the micropyle, the end ruptures, and the sperm is released, which combines with the egg cell to become a fertilized egg.

Fertilization: The process in which plant sperm and egg cells combine to form fertilized eggs.

Fruit and seed formation

After fertilization is completed, the calyx, corolla, stamens, and the stigma and style of the pistil will generally gradually wither, and only the ovary of the pistil will develop into a fruit.

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

Sexual Reproduction of Plants PPT, Part 4: Summary of this Lesson

1. Sexual reproduction: A reproductive method in which the reproductive cells of both sexes combine to form fertilized eggs, which then develop into new individuals.

2. Plant pollination: self-pollination, cross-pollination

3. Fertilization of plants: the process of combining sperm and egg cells to form fertilized eggs

4. Formation of seeds and fruits:

Sexual Reproduction of Plants PPT, Part 5: Multiple Choice Questions

1. The site where the fertilized egg of a plant cell develops is ( )

A. Anther B. Stigma

C.ovary D.ovule

2. The essential difference between asexual reproduction and sexual reproduction is ( )

A. Can new individuals be produced directly from the mother?

B. Can cells divide?

C. Is there a combination of reproductive cells of both sexes?

D. Is there an increase in the number of cells?

3. A peach blossom that has been bitten by pests cannot bear fruit, so the structure in the flower that has been bitten by pests is ( )

A. Filigree B. Corolla

C. Stamens D. Pistils

4. For green flowering plants to form fruits and seeds, two important physiological processes must be completed: ( )

A.Flowering and pollination B.Flowering and fertilization

C.Pollination and fertilization D.Self-pollination and cross-pollination

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...

"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...

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Update Time: 2024-11-22

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

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