"Regulation of Plant Life Activities" PPT courseware

Description

"Regulation of Plant Life Activities" PPT courseware

Part One: Take a guess

Last month, everyone could smell the fragrance of sweet-scented osmanthus on campus. Why did the sweet-scented osmanthus trees bloom almost at the same time?

(1) Osmanthus varieties include golden osmanthus, silver osmanthus, red osmanthus, laurel, etc.;

(2) In autumn, the light intensity shortens and the temperature difference increases, which is the most suitable time for sweet-scented osmanthus to bloom;

(3) Osmanthus can be used not only for viewing, but also for making cakes, making tea, making wine, etc.

think about it

Do you also know what similar phenomena occur in plants in nature?

Regulation of plant life activities PPT, Part 2: Sensitivity of plants

Sensitivity: The ability of plants to sense stimuli and respond to them is called the sensitivity of plants.

Tropical movement: It is a directional movement caused by a plant being stimulated by a single external factor. The direction of the plant's tropic movement changes with the change of the direction of the stimulus.

Phototropism: The phenomenon of plants growing toward the light source when illuminated by unidirectional light is called correlation.

Geotropism: The phenomenon that plant roots will grow in the direction of gravity under the influence of gravity.

Thiptropism What will you find when you touch the leaves of Mimosa pudica with your hands?

Sensory movement: Another form of plant sensitivity. It is movement caused by the stimulation of certain external factors or internal physiological mechanisms, but the direction of movement has nothing to do with the direction of the stimulation.

Fertilizer: Plant roots grow toward areas with more fertilizer

Summarize

1. The stimulation of directional movement is unidirectional, and the direction of movement is related to the direction of stimulation. Perceptual movement has no requirement on the direction of external stimulation, and the direction of movement has nothing to do with the direction of stimulation.

2. Tropical movements are growth movements and generally occur slowly, while perceptual movements generally occur quickly and are easily observed in a short period of time.

Regulation of plant life activities PPT, Part 3: Plant hormones

Self-learning

1. What are plant hormones?

2. What are the types of plant hormones and what are their functions?

3. How does auxin act on plants?

Phytohormones: refer to certain trace organic substances that are synthesized in plants, transported from the site of production to the site of action, and have a significant regulatory effect on the life activities of plants.

Auxin production, transport and distribution

1. Where is the main synthesis site of auxin?

Mainly in young buds, leaves and developing seeds.

2. What are the characteristics of auxin transport?

Polar transport (active transport): can only be transported from the upper end of the morphology (such as the top of stems and roots) to the lower end (such as the base of stems and roots), and cannot be transported in reverse.

Regulation of plant life activities PPT, part 4 content: Summary:

Concept: The property of plants to sense and respond to stimuli.

Performance: After plants experience stimulation, their morphology, physiology and behavior undergo corresponding changes.

Tropical movement:

The phototropism, thigmotropism and thermotropism of the stem;

Root tropism, water tropism and fertilizer tropism.

Sensual movement:

Mimosa, flytrap, pitcher plant, etc. move when touched, and poinciana, tulip, etc. open and close their flowers (leaves) due to changes in light (temperature).

Meaning: To enable plants to better adapt to changes in the environment, which is beneficial to survival.

Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, regulation of plant life activities PPT download, .PPT format;

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"Regulation of Plant Life Activities" PPT:

"Regulation of Plant Life Activities" PPT Part One: Sensitivity of Plants 1. Sensitivity: The characteristic of plants to sense stimuli and respond. 2. Sensitive performance: After plants feel stimulation, their morphology, physiology and behavior will change accordingly. 3. Orientation...

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Update Time: 2024-09-26

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 1 industry PPT template

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