"Various Flowers" New Life PPT Courseware 3

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"Various Flowers" New Life PPT Courseware 3

What are the similarities and differences in the structure of flowers? Which parts of the flower are related to reproduction?

What are the similarities and differences between the flowers we just observed?

same place

All have petals, sepals, stamens and pistils

different places

Different colors, shapes and smells

Observation 1

Observe whether the begonia, mulberry, calla lily and poplar flowers have sepals and petals.

I discovered: Begonia flowers have sepals and petals; mulberry flowers have no sepals and no petals; calla lilies have only sepals but no petals; poplar flowers have no sepals and no petals.

Observation 2

Observe daffodils and loofah flowers to see if they have stamens and pistils in their flowers.

Through observation I found:

Daffodils have both stamens and pistils; some loofahs have only stamens and some only pistils.

Complete flowers and incomplete flowers

Like rapeseed flowers, it consists of four parts: sepals, petals, stamens, and pistils. Such a flower is called a complete flower; a flower missing any of these parts is called an incomplete flower.

Complete flowers: rapeseed flowers, peach blossoms, begonia flowers, daffodils, etc.

Incomplete flowers: mulberry, poplar, calla lily, loofah, etc.

Unisexual and bisexual flowers

Flowers with only stamens and no pistils are called male flowers, and flowers with only pistils and no stamens are called female flowers. Both male and female flowers are unisexual.

think about it

Can male flowers bear fruit? Can only female flowers bear fruit? How do stamens and pistils form fruits and seeds?

Pistils and stamens are involved in the formation of fruits and seeds.

practice

1. Fill in the blanks

1. Like rapeseed, a flower composed of four parts ( ), ( ), stamens and pistils is called ( ). A flower missing any of its parts is called ( ).

2. A flower with only stamens and no pistils is ( ); a flower with only pistils and no stamens is ( ). Both of these flowers are ()

2. Judgment questions

1. The stamens and pistils of flowers are related to the formation of fruits and seeds. ( )

2. Flowers can be divided into complete flowers and incomplete flowers according to their structure. ( )

3. Some flowers have both stamens and pistils. ( )

4. Some flowers have only stamens or only pistils. ( )

5. Complete flowers must be bisexual flowers. ( )

6. Incomplete flowers must be unisexual flowers. ( )

7. All plants can bloom. ( )

8. Among the various parts of the flower, stamens and pistils are related to the formation of fruits and seeds. ( )

3. Q&A

2. Which part or parts of the flower structure form fruits and seeds and are related to reproduction?

Answer: In the structure of flowers, stamens and pistils are related to the formation of fruits and seeds and the reproduction of plants.

3. Can male flowers bear fruit? Can only female flowers bear fruit?

Answer: Among all kinds of flowers, male flowers cannot bear fruit, and only female flowers cannot bear fruit.

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"Various Flowers" New Life PPT Courseware 2:

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Update Time: 2024-09-22

This template belongs to science courseware Fourth Grade Science Volume 2, Textbook Edition industry PPT template

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