"Regulation of Plant Life Activities" PPT

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"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. Tropical movement: Certain organs on the plant body can move accordingly according to the direction of stimulation.

1. Phototropism:

The branches and leaves of plants grow toward the side with stronger light.

Plant phototropism enables plants to obtain more sunlight and is an adaptation of plants to a photosynthetic lifestyle.

Tropical movement: The direction of movement of plant organs is related to the direction of stimulation.

Sensory Movement: The direction of movement of a plant organ is independent of the direction of the stimulus.

2. Geotropism, negative geotropism

How to design an experiment to prove the characteristics of root growth?

Although the orientation of various seeds is different, under the action of gravity in the vertical downward direction, the germinating roots will grow toward the ground, and the buds will grow behind the ground.

3. Hydrotropism

How to design an experiment to prove that roots have the characteristics of water-oriented growth?

Why do plants growing in arid areas have particularly developed root systems?

The growth of plant roots is hydrotropic. The groundwater level in arid areas is low. Only by growing downward can the roots obtain enough water to sustain their life activities.

4. Thiptropism

If you touch the leaves of Mimosa pudica with your hands, what will you notice?

Regulation of plant life activities PPT, part 2 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: phototropism, thigmotropism, and thermotropism of stems; geotropism, hydrotropism, and fertilization of roots.

Sensory movement: Mimosa, flytrap, pitcher plant, etc. move when touched, 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 courseware:

The first part of the PPT courseware "Regulation of Plant Life Activities": 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) There are golden osmanthus varieties. Osmanthus, silver osmanthus, osmanthus, laurel, etc.; (2..

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Update Time: 2024-11-24

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

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