"Flowers, Fruits and Seeds" New Life PPT Courseware

Description

"Flowers, Fruits and Seeds" New Life PPT Courseware

Scientific concepts:

1. Fruits and seeds are formed after plants bloom, are pollinated and fertilized.

2. Stamens and pistils play a very important role in the formation of fruits and seeds. The stamens and pistils have special structures that allow the ovules to be fertilized and grow into fruits and seeds.

We have observed rapeseed flowers and learned about various flowers. We know that many plants bloom and bear fruit. What is the relationship between flowering and fruiting?

The basic structure of a peach blossom

A flower is mainly composed of sepals, petals, pistils and stamens. Through observation, we can see that there is pollen inside the stamens, and the lower part of the pistil is the ovary.

Observe the stamens of the flower

The stamens include anthers and filaments, and the anthers contain a lot of pollen.

The pistil consists of three parts: stigma, style and ovary. The column is sticky and is easily stained with pollen.

fertilization process

The pollen produced by the stamens travels to the stigma of the pistil and fertilizes the ovules of the pistil's ovary. After the ovules are fertilized, the fruits and seeds begin to grow, and the flowers begin to wither.

do you know?

1. In spring, there are often bees flying in the orchard. Is this good for the fruit trees?

Answer: Flowers bloom in the orchards in spring. Most of the flowers in the orchard are entomophilous, so they attract bees to collect pollen.

2. If the pistil of a flower is eaten by a pest, will the flower still bear fruit? Why ?

Answer: No. Because the fruit develops from the ovary that constitutes the pistil.

Summarize

Structure of stamens and pistils.

The pollen produced by the stamens travels to the stigma of the pistil, fertilizing the ovules in the ovary of the pistil. After the ovules are fertilized, the fruits and seeds begin to grow, and the flowers begin to wither.

Operation

1. Complete the homework book

2. Search for information to learn about other methods for plants to spread pollen.

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"Flowers, Fruits and Seeds" New Life PPT Download:

"Flowers, Fruits and Seeds" New Life PPT Download Part One: Introduction of New Knowledge Why do some flowers on the same plant bear fruit while others do not? How are the fruits and seeds of plants formed? ... ... ... Flowers, fruits and seeds PPT...

"Flowers, Fruits and Seeds" New Life PPT:

"Flowers, Fruits and Seeds" New Life PPT Part One: Stamens and Pistils Put the stamens of several flowers together and observe what they have in common. Use a magnifying glass to look at the various parts of the stamen. Shake the pollen on the anthers onto the white paper and observe. ... ..

"Flowers, Fruits and Seeds" New Life PPT Courseware 2:

"Flowers, Fruits and Seeds" New Life PPT Courseware 2 We have observed rape flowers, and also got to know various flowers in nature, and know that many flowers will bloom and bear fruit. Flowers of plants are responsible for producing seeds and propagating new life. Plant fruits and seeds...

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Update Time: 2024-10-23

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

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