| Category | Format | Size |
|---|---|---|
| Beijing Normal University Edition Seventh Grade Biology Volume 1 | pptx | 6 MB |
"Growth of Reproductive Organs" PPT
Description
"Growth of Reproductive Organs" PPT
Part One: Let’s talk about it
Have you seen the colorful flowers above, do you like them? Do you know what flowers do?
Social functions: appreciation, making honey, medicinal, edible...
Natural function: Green plants reproduce through flowers and form fruits and seeds. (main effect)
Growth of reproductive organs PPT, part 2: learn new knowledge
1. The formation and opening of flowers
1. Flowers are the reproductive organs of plants, developed from flower buds. Before they open, they are called flower buds.
2. Flower buds will open under certain conditions. This phenomenon is called flowering.
3. The flowering phenomenon of green plants has its own characteristics
2. The structure of flowers
These flowers are all different in shape, size, and color, but they have the same basic structure.
What are the basic structures of flowers? What are the functions of each? Let’s explore it together.
Growth of reproductive organs PPT, part 3: experimental exploration
Dissect and observe the structure of flowers
1. Purpose and requirements: See textbook P116
2. Materials and tools: See textbook P116
3. Methods and steps:
a. Observe and identify the various parts of the flower;
b. Use forceps to dissect in sequence (from outside to inside);
c. Use a magnifying glass to observe the stamen structure and a microscope to observe the anthers;
d. Use a magnifying glass to observe the pistil structure, dissect the ovary and use a magnifying glass to observe the ovules inside the ovary;
4. Notes:
1) Correct anatomy steps from outside to inside;
2) Avoid damaging the flowers and save each structure for later use;
3) Group three adjacent students to complete the experiment while experimenting and discussing.
5. Discussion:
a. What are the basic structures of a flower?
b. What are their functions?
c. Which structure is the main structure of the flower?
Growth of reproductive organs PPT, Part 4 content: Classification of flowers
Hermaphroditic flowers - flowers with both stamens and pistils on one flower (most flowers such as tulips and roses).
Unisexual flowers – Flowers that have only one type of stamen are called unisexual flowers. A flower with only stamens on a flower is called a male flower; a flower with only pistils on a flower is called a female flower (cucumber flower, etc.), which can develop into fruits.
Asexual flower - A flower that has neither stamens nor pistils (a few flowers such as sunflowers).
Others - no calyx and corolla, such as wheat flowers and rice flowers, whose stamens are protected by stamens.
Give it a try:
What are the main parts of a flower?
Flower stalk, receptacle, calyx, corolla, stamens
What two types of stamens are there? Can you name the structure of each?
Stamens include stamens and pistils.
Stamens include anthers and filaments; pistils include stigma, style and ovary
Growth of reproductive organs PPT, Part 5: Think about it
1. Flowers are beautiful because of their colorful petals, which often make us intoxicated. So are petals the main structure of a flower? What are the main structures of a flower? Why?
no.
The main structure of the flower is the stamens, which are the stamens and the pistil. Because it is related to the formation of fruits and seeds.
2. If a pest eats the pistil of a flower, can the flower still develop into a fruit? Why?
cannot. Because fruits develop from the ovary of the pistil, this flower has no ovary and cannot develop into a fruit.
3. Why do some flowers of cucumbers and other fruits and vegetables produce fruits, while others do not?
They are unisexual flowers whose female flowers can bear fruits but the male flowers cannot.
Growth of reproductive organs PPT, Part 6 content: Class summary
In this class we learned about the structure of flowers and learned that a complete flower usually includes the following structures: flower stalk, receptacle, calyx, corolla and stamens.
The stamen is the most important structure of the flower and is closely related to plant pollination and fertilization. The stamens are divided into stamens and pistils.
The gender types of flowers include: bisexual flowers, unisexual flowers, and asexual flowers.
Keywords: Free download of Beijing Normal University edition biology PPT courseware for the first volume of the seventh grade, growth of reproductive organs PPT download, .PPT format;
For more information about the PPT courseware "The Life History of Green Flowering Plants and the Growth of Reproductive Organs", please click the "The Life History of Green Flowering Plants ppt Growth of Reproductive Organs" ppt tag.
"Growth of Reproductive Organs" PPT courseware:
"Growth of Reproductive Organs" PPT courseware Part One: Situation 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: 2024-07-02
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