"Germination of Plant Seeds" PPT

Description

"Germination of Plant Seeds" PPT

Part One: Situation Import

Information: Many crops are sown in spring. Before sowing, it is often necessary to pour some water into 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?

learning target

1. Description Plant seeds are mainly composed of seed coat and embryo.

2. Describe the process of plant seed germination and the external conditions required for germination.

Germination of plant seeds PPT, Part 2: Structure of seeds

Observe and think:

1. What are the structures of soybean seeds?

2. What structures are related to seed germination?

3. What are the important parts of a seed?

Observation method: From the outside to the inside, first observe the external form, and then observe the internal structure.

Observation steps:

1. Observe the appearance of the seed - the hilum on the seed coat (the trace left on the seed coat after the seed matures and separates from the seed stalk. It is the channel through which the seed obtains nutrients from the mother body.)

2. Test the toughness of the seed coat and think about the role of the seed coat.

3. Dissect the soybean seeds, peel off the seed coat, and gently separate the two bean petals from the side opposite to the hilum.

4. When observing, first distinguish the embryo and the radicle. The connected part in the middle is the hypocotyl.

5. Two watercress are two cotyledons, think about its function.

Germination of plant seeds PPT, Part 3: External conditions required for seed germination

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

Make assumptions: Seed germination requires a certain amount of water, sufficient 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.

Germination of plant seeds PPT, part 4: training to meet standards

1. Divide the seeds with complete and full particles into two groups, A and B, and sow them separately at about 25°C. Group A is planted in fertile and moist soil, and group B is planted in poor and moist soil. The germination of these two groups of seeds will The situation is ( )

A. B sprouts first. B. A sprouts first.

C. germinate at the same time D. neither germinate

2. Different parts of the four corn seeds in the picture are damaged (shaded areas). Which one will definitely not germinate?

What cannot germinate is ______, tell the reason_______________

3. There is a riddle describing the peanut fruit: "The hemp house, the red curtain, and the fat white man lives inside." The hemp house refers to the peanut fruit ( ), the red tent refers to ( ), and the white fat man refers to ( )

A. pericarp B. seeds C. seed coat

D. Embryo E. Endosperm F. Cotyledon

4. Use your hands after class

Students cultivate a plant themselves, observe its germination process, and write a short essay on plant germination.

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware free download, germination of plant seeds PPT download, .PPT format;

For more information about the PPT courseware "The Life of Green Plants and the Germination of Plant Seeds", please click on the "The Life of Green Plants" PPT and the Germination of Plant Seeds PPT tag.

"Germination of Plant Seeds" PPT courseware:

The first part of the PPT courseware "Germination of Plant Seeds" content: Classroom observation to observe the internal structure of kidney bean seeds: Use a blade to make a small opening in the curved part of the seed, peel off the seed coat, and then gently break it open to observe the internal structure with a magnifying glass. Observe and think. : 1. Bean seeds..

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Update Time: 2024-07-01

This template belongs to biology courseware Jiangsu Education Edition Seventh Grade Biology Volume 1 industry PPT template

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