"How Plants Reproduce" Plant Life System PPT Courseware 2

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"How Plants Reproduce" Plant Life System PPT Courseware 2

discuss:

1. What are the labor-saving machines in life?

Lever, ramp, pulley, gear.

2. If paper with the same texture is folded into different shapes, will their endurance be the same?

The difference is that the more corners there are, the more stable it is.

3. What kind of bracket is the most stable? When the bracket is unstable, what methods do you use to make it stable?

triangle. How to add beams.

4. Among bridges made of the same material, which one has the greatest bearing capacity?

Arched bridge.

Observe the plants above. How do they reproduce?

A new plant grows when a leaf falls to the ground.

Some small leaves will sprout from the edges of the old leaves upward. Pick off the small leaves (with adventitious roots) and insert them directly into the soil to survive.

Daffodil bulbs will take root, sprout and bloom when immersed in water.

A piece of potato with "eyes" can sprout and grow.

Get your hands dirty: Choose from one of the activities below.

Use the roots of carrots and lotus roots to propagate.

Propagate from the fleshy leaves of gem flowers.

Use chrysanthemum stems to propagate.

To sum up: plants can take root, sprout and grow up without using seeds.

This method of reproduction using roots, stems, leaves, and buds is asexual reproduction. Asexual reproduction exists in both plants and animals. In plants, this type of asexual reproduction is called vegetative reproduction.

What are the similarities and differences between the two methods of plant reproduction?

Same: can produce new individuals

Difference: Green flowering plants have two ways of reproduction: asexual reproduction and sexual reproduction.

Asexual reproduction requires only a certain part of the plant's vegetative organs to directly develop into new individuals, also called vegetative reproduction.

Sexual reproduction is the process by which plants produce fruits and seeds through processes such as flowering, pollination, and fertilization.

Planting Tips

1. When using ginger, spider plant, narcissus, potato and other plants for vegetative propagation, you must bring a bud or "bud eye"

2. When propagating stem cuttings, first use chopsticks to insert a small hole in the pot, and then insert the branches. Be careful to leave 1 to 2 nodes above the soil, keep a few leaves on the upper ends of the branches, and slant the lower ends of the branches. Cut out at 45 degrees.

3. After cutting, water immediately to maintain soil moisture, so that the branches can easily take root and sprout, and the planting survival rate is relatively high.

NOTE: Pay attention to safety when using tools.

What is the difference between propagating by seeds and propagating by vegetative means?

1. Vegetative reproduction can reproduce faster and more efficiently

2. At the same time, it can better preserve the excellent characteristics of the mother body.

3. Enhance plants’ cold resistance, drought resistance and resistance to pests and diseases

4. Reproduction with seeds is sexual reproduction, which requires the combination of sperm and egg cells to produce genetic recombination; vegetative reproduction is asexual reproduction, without genetic recombination, the genes will be the same as those of the parents.

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For more information about the PPT courseware "The Life System of Plants and How Plants Reproduce", please click the ppt tag of "The Life System of Plants and How Plants Reproduce".

"How Plants Reproduce" Plant Life System PPT Courseware 3:

"How Plants Reproduce" Plant Life System PPT Courseware 3 Life is limited. So how should life continue? What organs do plants use to reproduce? The pistil (ovary) and stamens (pollen) of the flower. Pollination methods: self-pollination, cross-pollination..

"How Plants Reproduce" Plant Life System PPT Courseware:

"How Plants Reproduce" Plant Life System PPT Courseware Go to a nursery for an outing. Spring is the season when all things revive. Let's go and see the plants growing in the nursery! ! ! Thought and Discussion How are plant seedlings propagated in nurseries? ..

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Update Time: 2024-11-22

This template belongs to science courseware People's Education Press Sixth Grade Science Volume 1 industry PPT template

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