Summary of an open lesson on literary reading in grade 4 I.A. Bunin "Leaf fall. Picture of autumn in verse"

Conducting experiments on changing leaf color

Experiments No. 1,2 Isolation of chlorophyll from lilac leaves

Experiments No. 3,4 Isolation of anthocyanin from red cabbage leaves.

Classmate survey results

I read in the atlas-identifier A.A. Pleshakova “From Earth to Sky” information about each tree and shrub that I will study, and conducted a survey among classmates, trying to find out what they think about the change in leaf color before leaf fall.

Poll of classmates on the topic: “Why do leaves change color?”

Changing the color of leaves of trees and shrubs to different

subseasons of autumn

Results of experiments on pigment extraction

EXPERIMENT No. 1. Isolation of chlorophyll from lilac leaves
Equipment and materials: lilac leaf, alcohol, flask

Progress of work: for the experiment I took a lilac leaf, because it contains only one pigment - chlorophyll. She put it in a flask, filled it with alcohol and began to observe what was happening. After 5-7 minutes, dark spots appeared on it. In the place where the leaf was slightly torn, a light green color appeared. The alcohol acquired a light green tint. I waited another 20 minutes, but the color did not become brighter.

Conclusion: The change in color of the alcohol occurred because chlorophyll dissolves in the alcohol.

EXPERIMENT No. 2. Isolation of chlorophyll from lilac leaves

Equipment and materials: lilac leaf, alcohol, flask, cup, tripod, dry fuel, tray, matches

Progress of work: now I decided to heat the flask with alcohol, in which there was already a lilac leaf, in a water bath. When the water in the cup is hot,

the alcohol began to turn green. After 5 minutes the alcohol completely changed its color

Conclusion: chlorophyll dissolves in alcohol, and when heated, this process occurs faster. A strong alcohol extract from green leaves looks emerald green in the light.

EXPERIMENT No. 3. Isolation of anthocyanin from red cabbage leaves

Equipment and materials: red cabbage leaves, saucepan, spoon, 9% acetic acid.

Progress of work: for the experiment, I took red cabbage leaves, because they contain anthocyanin , put them in a saucepan, and put them on fire. When the water boiled, a turquoise hue appeared. Then the color of the water became more saturated. I dropped a few drops of 9% acetic acid directly into the pan and the water in the pan took on two different shades. Where the acid hit, the water turned pink, and the second part of the water remained turquoise. I stirred the water in the pan with a spoon, and the water turned bright pink. I took out a cabbage leaf with a spoon and saw that now it was not purple, but pale yellow. I spent 15 minutes doing the experiment.

Conclusion: Red cabbage leaves contain anthocyanin, which gives the leaves a pink color.

EXPERIMENT No. 4. Isolation of anthocyanin from red cabbage leaves

Equipment and materials: red cabbage leaves, glass saucepan, plate, glass, 70% acetic acid

Procedure: I took 3 leaves of red cabbage, put it in a pan with water and put it on the fire. When the water in the pan began to boil, the water began to change color. At first it turned light blue, then the water became greenish, and whitish spots appeared on the leaves. I decided to cook the leaves longer, after 20 minutes they turned dark green and the water turned a dirty red hue. I poured the water into a glass, dropped a few drops of 70% acetic acid, and the water turned bright red.

Conclusion: this experiment proves that plant leaves contain a pigment - anthocyanin, which gives the water a red color.

General results of studying leaves for the release of pigments:

Conclusion

Having studied the literature on the topic, I learned that leaf fall is the natural falling of leaves of trees and shrubs associated with preparation for winter. I observed the color of leaves of trees and shrubs in the fall and saw that the leaves were colored differently.

After conducting experiments, I learned that the change in leaf color depends on what pigment, other than chlorophyll, is in the leaf. I found out that trees and shrubs shed their leaves to survive in the winter.

My FIRST HYPOTHESIS, that the trees get sick in the fall and therefore change the color of the leaves, was not confirmed. But I realized that the autumn color of leaves depends on what pigment, besides chlorophyll, is in the leaves.

My SECOND HYPOTHESIS, that the leaves are afraid of the cold and therefore fly away in the fall, was also not confirmed. But I learned that trees and shrubs benefit from losing their leaves in order to survive the cold winter. The color of the leaves depends on the presence of one or another pigment, the content of which depends on the length of daylight hours.

Bibliography

1. Pleshakov A. A., From earth to sky. Atlas-determinant [text]/ M.: Education, - 1998.- 84-91 p.
2. Dietrich A., Yurmin. G., Why. Children's Encyclopedia [text]/ M.: Pedagogika-press, - 1993. - 182-184 p.
3. Children's encyclopedia. Forest [text]/ - 2003 - No. 8. - 24-40 p.
4. Graubin G., Why leaves fall in autumn [text] / M.: Malysh, - 1985. - 2-24 p.
5. Kurkova S. SM, Sidorenko V. N. The world around us [text] / M.: Paritet, - 2004. - 27-28 pp., 128-129 pp.
6. Kozhevnikov A.V., Spring and autumn in the life of plants [text]/ M.: Vlados, -1983. – 57-59 p.
7. Children's encyclopedia. The World of Forest [text]/ M.: Makhaon, 2008. 44-45 p.
8. Internet sites.

so UNT / Russian literature / Lesson plans for literary reading grade 4

Lesson 29 IVAN ALEXEEVICH BUNIN. "LEAF FALL"

26.07.2013 10140 0

Goals:

introduce students to the poetry of the 19th – early 20th centuries; introduce the life of I. A. Bunin, the works of I. A. Bunin, show the diversity of I. A. Bunin’s creativity; teach children the ability to sympathize, empathize, and have compassion.

During the classes

I. Organizational moment.

II. Checking homework.

Students expressively read N. A. Nekrasov’s poems “Schoolboy” and “Nanny’s Tales in the Winter Twilight...” and select the best reader.

– Which lines of the poem most attracted your attention? Read them.

Physical education minute

III. Learning new material.

– Today we will get acquainted with the work of Ivan Alekseevich Bunin.

– Which works of I. A. Bunin are familiar to you?

– Why are they interesting, why did they attract your attention?

– What do you think, what fate, character, hobbies, interests did the person who created such poems have?

– On his father’s side, I. A. Bunin came from an old noble family, to which the poet Vasily Andreevich Zhukovsky belonged. The writer himself said that his family gave Russia “many prominent figures both in the field of government and in the field of art...”. “All my ancestors,” Bunin emphasized, “were connected with the people and the land...”

Bunin's childhood (except for the first four years, when the family lived in Voronezh) was spent on a small family estate in the Oryol province among truly Russian nature. At the age of ten, he was sent to the Yeletsk gymnasium, where literature classes became his favorite. After the fifth grade, there was nothing to pay for education, and Bunin’s beloved Butyrki farm had to be sold, otherwise the family was threatened with ruin. Subsequently, Ivan Bunin studied at home, under the guidance of his older brother, who prepared Ivan for the matriculation exam.

Already in childhood, Bunin’s extraordinary impressionability and sensitivity manifested itself.

The first poems of I. A. Bunin were published in 1887, he was 17 years old at that time. Soon his stories, essays, and critical articles appeared. In 1891, the first book of poems by I. A. Bunin was published in Orel. A few years later, several collections of Bunin were published (“To the End of the World” - 1897, “Under the Open Air” - 1898, “Poems and Stories” - 1900, “Leaf Fall” - 1901), and I. A. Bunin is gaining his place in the artistic life of Russia.

In addition, Bunin independently learned English and translated Byron, the American poet Henry Longfellow, and the Ukrainian poet Taras Shevchenko. In 1903, the Academy of Sciences awarded Bunin the Pushkin Prize for “Falling Leaves” and “The Song of Hiawatha” (translation of G. Longfellow’s work). I. A. Bunin was awarded the Pushkin Prize three times. In 1909, I. A. Bunin was elected an honorary member of the Academy of Sciences. In 1933, I. A. Bunin was the first Russian writer to be awarded the Nobel Prize.

More than anything else in the world, besides poetry and prose, Ivan Alekseevich loved traveling. He called himself a “wanderer,” that is, a traveler. He traveled throughout the south of Russia, traveled a lot in the East, knew the Mediterranean well, lived in Italy, Capri, visited Ceylon and Africa.

Having become a famous writer, I. A. Bunin loved those whom he considered truly talented, helped many with money, advice, and provided patronage to the young.

After the story about the writer’s fate, the teacher should give students the opportunity to express their thoughts and share their impressions.

– Now let’s read a poem by I. A. Bunin, which is called “Falling Leaves.” Your textbooks only give you an excerpt of the poem, and if you like it, you can find it in the library to read in full.

The teacher reads the poem expressively.

– What do you want to say?

– What pictures did you imagine when you listened to the poem?

– What new sides of I. A. Bunin’s poetry have opened up to you?

– Have you observed anything like this?

– What mood does the poem evoke?

– What epithets, metaphors, comparisons does the author use?

- Write them down in your notebook.

It is better to do this work in groups and then check it.

IV. Lesson summary.

– Did you like today's lesson? How?

– What do you remember most?

– What discoveries did you make?

– What else would you like to accomplish?

 Homework:

prepare an expressive reading of I. A. Bunin’s poem “Falling Leaves” (pp. 152–153, part 1);
learn by heart a passage that begins with the words “ The forest is like a painted tower...”
and ends with the words
“And Autumn, a quiet widow, enters her colorful tower...”
; make a drawing for a poem; prepare for a general lesson and test.