"Blooming and Fruiting" Life of Angiosperms PPT Courseware 6

Description

"Blooming and Fruiting" Life of Angiosperms PPT Courseware 6

learning target:

1. Describe the basic structure of flowers;

2. Describe the process of pollination and fertilization;

3. Outline the relationship between flowers, fruits and seeds, and develop the habit of caring for flowers;

4. The process of turning flowers into fruits reminds me of the process of life. Cherish time and study hard. Establish correct values ​​in life.

Key points and difficulties in learning:

Focus: The basic structure of flowers, the process of flowering and fruiting.

Difficulty: The process of fertilization and the development of the ovary after fertilization.

1. The structure of flowers

The main structures of a flower are stamens and pistils.

What are the important processes from flower to fruit?

For a flower to develop into a fruit, it must go through two processes: pollination and fertilization.

2. Pollination and fertilization

1. Pollination

Concept: The anthers will split naturally when mature and release pollen. The process of pollen falling from the anthers to the stigma of the pistil is called pollination.

There are generally two types of plant pollination: self-pollination and cross-pollination.

Self-pollination: Pollen grains produced by the stamens of a flower land on the stigmas of the pistils of the same flower.

Cross-pollination: Pollen grains produced by the stamens of one flower fall on the stigma of the pistil of another flower through external force.

Cross-pollination requires a certain media, mainly wind and insects.

2. The process of fertilization

After the pollen falls on the stigma, it begins to germinate and grow a pollen tube under the stimulation of the mucus on the stigma. The pollen tube passes through the style, enters the ovary, and reaches the ovule. The sperm in the pollen tube moves downward as the pollen tube elongates, and eventually enters the interior of the ovule. The ovule contains an egg cell, which combines with sperm from the pollen tube to form a fertilized egg. This process is called fertilization

discuss:

1. Which structures of flowers are most important for plant reproduction?

Stamens: provide pollen and thus sperm

Pistil: provides the ovule, which in turn provides the egg cell

2. After pollination and fertilization, which part of the flower will continue to develop into fruits and seeds? Why?

Ovary; because the ovule is in it, and after fertilization, there is a fertilized egg in the ovule

Class exercises:

1. The main structure of a flower is ( )

A. Petals B. Stamens and pistils C. Ovule D. Ovary

2. The structure of flowers that is directly related to the production of fruits and seeds is ( )

A. Style and filaments B. Corolla and calyx

C. Nectaries and receptacles D. Pistils and stamens

3. During fertilization in green flowering plants, what transports sperm to the ovule? ( )

A. Pollen B. Pollen tube C. Anthers D. Stamens

4. During the reproduction process of angiosperms, stamens produce ________ and pistils produce _____. _____ falls on the stigma, and finally ______ and _______ combine in the ovule to form _____. An embryo that develops into a seed from _____.

5. The main part of the flower is ______, which includes _____ and _____.

6. Flowers must go through ______ and ______ to form fruits and seeds.

7. Pollination is the process in which pollen falls from _____ to the _______ of _____. Divided into _________ and _________.

Compliance testing

1. For plant reproduction, the most important structure in the flower is ( )

A.Torus and sepals B. Stamens and pistils

C. Petals and sepals D Sepals and petals

2. The two physiological processes that green flowering plants must go through to form fruits and seeds are ( )

A. Flowering and fertilization B Self-pollination and cross-pollination

C. Pollination and fertilization D Flowering and pollination

3. The route of the pollen tube entering the ovule is ( )

A stigma ovary style ovule B ovule ovary style stigma

C stigma style ovary ovule D stigma style ovule ovary

4. The composition of pistil ( )

A Anthers and filaments B Stigma Style Ovary

C style, ovary D anthers and style

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For more information about the PPT courseware "Blooming and Fruiting in the Lifetime of Angiosperms", please click the "Blooming and Fruiting in the Lifetime of Angiosperms" ppt tag.

"Blooming and Fruiting of Plants" PPT courseware:

"Blooming and Fruiting of Plants" PPT courseware

Part One Content: The Composition of Flowers

corolla

The crown is made of petals.

Different types of flowers have different sizes, colors and numbers of petals.

calyx

The calyx is the part that supports the petals. When it is not blooming...

"Blooming and Fruiting of Plants" PPT:

"Blooming and Fruiting of Plants" PPT Part One Content: Classroom Thinking Thinking: What is the meaning of plant flowering? Which part of the flower will develop into fruit in the future? Which structures in flowers are most important for plants to reproduce? 1. Flower structure stamens ..

"Blooming and Fruiting" Life of Angiosperms PPT Courseware 7:

"Blooming and Fruiting" Lifetime of Angiosperms PPT Courseware 7 Learning Objectives 1. What is the main structure of flowers 2. Describe the process of pollination and fertilization 3. Clarify the relationship between flowers, fruits and seeds 1. The structure of flowers The main structure of flowers is stamens and pistil. From flower to fruit requires experience...

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Update Time: 2024-09-30

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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