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2024年5月16日发(作者：)

用叶子做的实验的英语作文

英文回答：

Experiment with Leaves: A Study of Chlorophyll.

Hypothesis:

Chlorophyll, the green pigment in leaves, is essential

for photosynthesis. The amount of chlorophyll in a leaf can

be determined by measuring the light absorption of the leaf

at different wavelengths.

Materials:

Fresh spinach leaves.

White light source.

Spectrophotometer.

Cuvettes.

Graduated cylinder.

Water.

Procedure:

1. Remove the midrib from a spinach leaf and tear it

into small pieces.

2. Place the leaf pieces in a graduated cylinder and

add water to make a 1:10 dilution.

3. Transfer the leaf-water solution to a cuvette and

place it in the spectrophotometer.

4. Record the light absorption of the leaf-water

solution at wavelengths from 400 nm to 700 nm.

5. Plot the light absorption data on a graph.

Results:

The light absorption spectrum of the leaf-water

solution showed a peak at around 430 nm and a second peak

at around 665 nm. These peaks correspond to the absorption

of blue and red light, respectively. The amount of light

absorption at these wavelengths is proportional to the

amount of chlorophyll in the leaf.

Conclusion:

The results of this experiment support the hypothesis

that chlorophyll is essential for photosynthesis. The

amount of chlorophyll in a leaf can be determined by

measuring the light absorption of the leaf at different

wavelengths.

中文回答：

实验器材：

新鲜菠菜叶。

白光源。

分光光度计。

比色皿。

刻度量筒。

水。

实验过程：

1. 去除菠菜叶的中脉并将其撕成小块。

2. 将叶片放入刻度量筒中并加水制成1:10稀释液。

3. 将叶水溶液转移到比色皿中并将其放入分光光度计中。

4. 记录波长从400nm到700nm时叶水溶液的光吸收。

5. 将光吸收数据绘制成图像。

实验结果：

叶水溶液的光吸收光谱在430nm左右出现一个峰，在665nm左

右出现第二个峰。这些峰分别对应于蓝光和红光的吸收。在这些波

长处的光吸收量与叶片中的叶绿素含量成正比。

实验结论：

实验结果支持如下假设，叶绿素对光合作用至关重要。通过测

量不同波长下叶片的吸光度可以确定叶片中的叶绿素含量。

本文标签： 实验叶片水溶液量筒光吸收

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