"Unintentional Intention of Willows and Willows" PPT

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Hunan Education Edition Fourth Grade Science Volume 2, Unintentional Intention PPT

Part One: Concept Interpretation

Which technique is used in the poem "Unintentionally inserting willows to create shade"?

Cutting: Cut a branch with buds and insert the lower part into moist soil.

The key to successful cutting is for the cutting branches to take root.

What should the stem segments of the cuttings have?

Strong branches with buds

What issues need to be paid attention to when layering?

When layering, peel off half of the bark in the middle of the branch, bury it in the soil and fix it, so that the top of the branch is exposed to the ground. After the branches buried in the soil grow adventitious roots and new shoots, they are separated from the parent body.

Generally, plants that are difficult to survive by cutting can be propagated by this method, such as osmanthus, pomegranate, Tibetan primula, etc.

grafting

Grafting is to connect the buds or branches of one plant to another plant so that the two connected parts grow into a complete plant.

Notes on grafting:

1. To ensure the survival of the scion, the cambium layer of the scion and rootstock should be tightly combined.

2. When bundling with plastic tape, pay attention to tightening it to prevent rapid evaporation of moisture at the joints or the entry of external rainwater.

The second part of PPT about unintentional insertion of willows: expansion and extension

Please answer the following questions based on the plant tissue culture flow chart:

1. What is the reproductive method of the above-mentioned process of producing new individuals? What are the principles of callus and test tube seedling formation?

Answer: Asexual reproduction; cell division and proliferation to form callus; cell differentiation to form buds, roots, and test tube seedlings.

2. In order for the culture process to proceed normally, what substances must be contained in the culture medium? After the test tube seedlings appear, light should be provided. Why?

Answer: It must contain water and inorganic salts; in order for the seedlings to carry out photosynthesis and synthesize the organic matter required for growth.

The difference between asexual reproduction and sexual reproduction

Asexual reproduction: the direct production of new individuals by the mother without the combination of reproductive cells of both sexes.

Maintain the excellent traits of parents and speed up reproduction

Sexual reproduction: after the union of reproductive cells of both sexes, the fertilized egg develops into a new individual

Combining the excellent traits of two parents and improving the ability to adapt to the environment

The third part of PPT about unintentional insertion of willows: after-class exercises

Practice questions

1. Which of the following organisms can reproduce both sexually and asexually? ( )

A. Frog B. Peach tree

C. swallow D. giant panda

2. Among the following structures, which one can develop into a new generation of plants ( )

A. Flower B. Ovary

C. Pollen D. Fertilized eggs

3. What kind of reproduction method does "unintentional planting of willows and willows create shade" refer to? ( )

A. Seed propagation B. Cutting propagation

C. Grafting propagation D. Layering propagation

Consolidation exercises

1. Which of the following belong to vegetative reproduction ( )

A. Sowing corn seeds

B. Seedlings sprout from wild fruits after they fall to the ground.

C. Use potato sprouts to develop into new plants

D. After planting the wheat seeds, the seeds sprouted

2. The key to successful grafting ( )

A. A T-shaped opening should be cut on the bark of the rootstock.

B. The transverse incision of the scion should be tied well

C. The scion and rootstock should be of the same thickness

D. The cambium layers of the scion and rootstock should be tightly integrated.

consolidate and improve

1. Among the following reproduction processes, which one is asexual reproduction ( )

① Use the root tip tissue of Weixian radish to cultivate radish seedlings ② Propagate seedlings of Zhucheng chestnut and Qingzhou peach ③ Use beans to propagate their offspring ④ Fuse the nucleus of the mammary gland cell of rabbit A into the enucleated egg cell of rabbit B. The cell develops into a new individual.

A.①② B.①③ C.①④ D.②④

2. “If you plant flowers intentionally, they will not bloom, but if you plant willows unintentionally, they will create shade.” In this proverb, the way a willow tree reproduces is ( )

A. Grafting propagation B. Cutting propagation C. Sexual reproduction D. Layering propagation

Keywords: Free download of science PPT for the second volume of the fourth grade of the Hunan Education Edition, PPT courseware for unintentional planting, .PPT format;

For more information about the PPT courseware "Unintentionally Planting Willows and Willows," please click the "Unintentionally Planting Willows and Willows" ppt tag.

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Update Time: 2024-11-17

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