"Germination of Seeds" Life of Angiosperms PPT Courseware

Description

"Germination of Seeds" Life of Angiosperms PPT Courseware

Situation import

Information: Many crops are sown in spring. Before sowing, it is often necessary to pour some water on the ground to make the soil moist. If there has just been a light rain, you can sow without watering; but too much moisture can easily cause the seeds to become moldy. . Before sowing, the soil is often loosened to allow sufficient air in the soil.

What conditions are needed for seeds to germinate?

External conditions required for seed germination

Ask the question: What are the external conditions that affect seed germination?

Make a hypothesis: Seed germination requires water, air, and suitable temperature.

Recommended equipment: petri dishes, absorbent paper, labels, water, wheat seeds.

Design experiment: Each group selects one or more conditions for experimental design and designs a control experiment.

It can be seen from analyzing the experimental results that

The environmental conditions required for seed germination are:

Suitable temperature, certain moisture and sufficient air.

Seed germination conditions

If we provide suitable temperature, certain moisture and sufficient air, will the seeds germinate?

Seeds that cannot germinate include:

shriveled seeds

Insect-bitten seeds

Seeds that have been stored for too long and have died

dormant seeds

Thoughts and Discussions

Although some seeds have intact and viable embryos and suitable external conditions, they cannot germinate immediately after they mature. Do you know the reason?

Seed dormancy: The seeds of some plants must go through a period of "sleep" before they can germinate. This phenomenon is called seed dormancy. (Seeds can survive the harsh winter and reproduce after dormancy. This is the result of the plant's long-term adaptation to the environment.)

Think about it:

1. Which part of the seed structure develops first?

2. Which part of the new plant does the radicle, hypocotyl, and embryo develop into?

3. What changes happened to the cotyledons?

Class summary

1. Conditions for seed germination

2. Germination process

(1) Absorb water and swell, the seed coat becomes soft, respiration is enhanced, and nutrients are decomposed.

(2) The radicle elongates, breaks through the seed coat, and develops into a root.

(3) The hypocotyl elongates and the embryo breaks through the seed coat and drills out of the ground.

(4) The unearthed germ continues to grow and develop into stems and leaves, and the endosperm and cotyledons continue to become smaller.

Standard training

1. Which of the following is not a necessary condition for seed germination ( )

A. Sufficient sunlight B. Sufficient air

C. Suitable temperature D. Suitable amount of moisture

2. Under the following conditions, seeds can germinate normally ( )

A. Fertile, water-filled, warm soil

B. Cold, loose, well-watered soil

C. Warm, moist, soft soil

D. Warm, dry, soft soil

3. Which structure of soybean seeds and mung bean seeds are formed from the soybean sprouts and mung bean sprouts that people often eat? ( )

A.Radule B.Gerule C. Hypocotyl D.Cotyledon

4. Which of the following seeds can develop into new plant larvae ( )

A.embryo B.germ C.cotyledon D.radicle

6. Take a part of viable and complete mung bean seeds and process them as shown in the table below. Please analyze and answer:

(1) How many groups of controls can be formed in this experiment? What are variables?

(2) Please predict the results of each set of experiments.

(3) What conditions does this experiment illustrate for seed germination?

(1) Three groups of controlled experiments can be formed: the variable in bottles No. 1 and No. 2 is water; the variable in bottles No. 3 and No. 2 is air; the variable in bottles No. 4 and No. 2 is temperature.

(2) No. 2 bottles germinated, but No. 1, 3, and 4 bottles did not germinate.

(3) Seed germination requires an appropriate amount of water, sufficient air and suitable temperature.

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For more information about the PPT courseware "The Germination of Seeds and the Life of Angiosperms", please click the "Germination of Seeds ppt and the Life of Angiosperms" ppt tag.

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Update Time: 2024-11-21

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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