"Plant Roots and Material Absorption" PPT courseware

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"Plant Roots and Material Absorption" PPT courseware

Part One: Discussion

1. What are the fundamental reasons for the continuous growth and elongation of roots?

The division of cells in the root apical meristematic zone and the differentiation and elongation of cells in the elongation zone.

2. In agricultural production, why do we need to transplant crop seedlings with soil?

The root hair damage is less, the plants can easily adapt to the new environment, and the survival rate of transplanted plants is improved.

question

Under what circumstances can plant roots absorb water from the soil?

Example: When too much fertilizer is applied to crops, the crops will wilt. This indicates that there is less moisture in the crop. Why?

Experimental phenomenon: Carrots in clear water did not wilt, but carrots in concentrated salt water did wilt.

Conclusion: Plant roots can absorb water only when the concentration of plant cell fluid is higher than the concentration of soil solution.

Plant roots and material absorption PPT, part 2 content: thinking

Is there any other way to prove that root hairs must indeed absorb water when the concentration of the soil is less than the concentration of the cell fluid?

When pickling vegetables, the vegetables lose water;

Seawater flooded into farmland and crops withered.

Under normal circumstances, the mass fraction of nutrients in the cell fluid of plant root hair cells is generally higher than the mass fraction of the soil solution, so it can absorb water from the soil. If too much fertilizer is applied, the mass fraction of the soil solution will exceed the mass fraction of the root hair cell fluid, and the cells will lose too much water and "burn the seedlings".

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, plant roots and material absorption PPT download, .PPT format;

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"Plant Roots and Material Absorption" PPT:

"Plant Roots and Material Absorption" PPT Part One Content: Root System Introduction (1) Root System of Plants: All the roots of a plant together are called root systems. A root system with clearly developed main roots and lateral roots is called a tap root system. There are no obvious main and lateral roots...

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Update Time: 2024-11-22

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 2 industry PPT template

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