"Blooming and Fruiting" Life of Angiosperms PPT Courseware 4

Description

"Blooming and Fruiting" Life of Angiosperms PPT Courseware 4

learning target:

Outline the structure of a flower and its main parts.

Describe the processes of pollination and fertilization.

Elucidate the correspondence between flowers, fruits and seeds.

Learn about the two types of pollination.

Learn about assisted pollination.

think

1. What buds do flowers develop from?

2. Do different flowers have the same size, shape and color?

Self-study issues

1. As a reproductive organ, which part of a flower will develop into a fruit in the future?

2. Which part of the flower is the most important for a plant to reproduce?

Explore further:

Suppose a flower's pistil is eaten by a pest, will the flower still develop into a fruit?

summary:

Flowers are composed of receptacles, sepals, petals, pistils, and stamens, among which pistils and stamens are the main structures of flowers.

2. Pollination and fertilization

When the stamens mature, the corolla and calyx open to reveal the stamens and pistils. This process is called flowering.

After the flower opens, the anthers of the stamens burst and the pollen is released and falls on the stigma of the pistil. This process is called pollination.

1. Pollination: The process of pollen falling from anthers to the stigma of pistils.

2. Fertilization: The egg cell inside the ovule combines with the sperm from the pollen tube to form a fertilized egg.

Expand, extend:

Read the small print on textbook P105 to learn about the agricultural products we eat: apples, grapes, watermelons, sunflower seeds, beans, corn and wheat seeds, broad beans, mung beans, almonds, etc. Which are the fruits of plants and which are the seeds of plants.

Fruits include: apples, grapes, watermelons, sunflower seeds, beans, corn and wheat seeds

Seeds include broad beans, mung beans, sesame seeds, peanuts, watermelon seeds, and almonds.

Artificial assisted pollination

Corn ears are missing kernels and sunflower seeds are hollow. What are the causes of these phenomena? How can we avoid these phenomena?

Students read the following passage on page 104 to themselves and think about their answers.

Consolidation exercises:

1. The main structure of a flower ( )

A. Petals B. Stamens and pistils

C.ovule D.ovary

2. If a flower is eaten by insects, the flower will not bear peaches.

A. Filaments B. Petals C. Stamens D. Pistils

3. What changes occur in the structure of each part of the flower during the development process from flower to fruit? Express it by connecting lines.

ovary peel

Ovary wall Fruit

ovule embryo

fertilized egg seed

Other parts wither

4. Pollen begins to germinate under the stimulation of mucus and grows _____.

5. During the flowering season of fruit trees, if you encounter continuous rainy weather, the yield of fruit trees will often be reduced. This is caused by _______.

6. The "hemp house", "red tent", and "white fat man" living in the proverbs describing peanut fruits refer to _____, ______, and ____ in that order.

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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: 2024-06-29

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

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