Why are the flowers so red What is the structure of urgency Thank you!

<> first layer (1 natural section) admires the bright beauty of safflowers, and asks the spine silver question.

The second layer (2 10 self-opening sections) illustrates the various reasons why the flowers are red. Sakura side feast.

The author explains the reasons from six aspects: material basis (2-4 natural segments), physical principles (5 natural segments), physiological needs (6 natural segments), evolutionary perspectives (7 natural segments), natural selection (natural segments), and artificial selection (10 natural segments).

The third layer (11 natural paragraphs) summarizes the reasons why flowers are so red.

This is due to the presence of pigment in the cell fluid of the petals. There are some flowers that are red, blue, or purple. These flowers contain.

Pigment is called "flower nutridin". When it encounters acid, it turns red, and when it encounters alkali, it turns blue. You can experiment with a trumpet flower by soaking the red trumpet flower in soapy water and it will quickly turn blue because soap is violet.

Then soak this blue flower in vinegar, and it will change its red color again, because vinegar is acidic.

There are also some flowers that are yellow, orange-yellow, and orange-red. Their petals contain a pigment called "carotene". Carotene was first found in carrots and there are more than sixty of them. Flowers that contain carotene are also colorful.

What pigments do white flowers contain? The white flowers have no pigment at all. It appears to be white, and that's because the petals are filled with small bubbles. You take a white flower, pinch the petals with your hand, squeeze out the small bubbles inside, and it becomes colorless and transparent.

"The flowers are red" is a subject-verb phrase.

Subject-verb phrases. It consists of two components that have a declarative relationship, the preceding part being stated is the subject, indicating who or what is to be said; The part that follows the statement is a predicate that states how or what the subject is. The relationship is stated in word order rather than in the absence of imaginary words.

For example: a good harvest (name) (what).

The flowers are so red because:

1. Their cell fluid contains anthocyanins, which are red when acidic, and the stronger the acidity, the redder the color.

2. Acidic anthocyanins will reflect the red light waves in the sun, and we see the safflower.

3. The tissues of the flowers, especially the petals, are relatively tender, and the red light waves that reflect the most heat can play a protective role in preventing burns.

4. Flower red is a masterpiece of nature, and sometimes it is also the result of artificial cultivation.

1. From an ecological point of view:

1. The internal factors (material basis) of the red: the needs of plant survival and development, the anthocyanin content and pH in the plant cell fluid, the stronger the acidity, the redder the color;

2. External causes of bonus: natural selection, artificial selection, safflower is the leader in the evolutionary process.

Second, the most effective pre-war words:

If you don't hit your face full of peach blossoms, you don't know why the flowers are so red!

Hope you are satisfied!

You'll know after reading it.

Why is it so red?

Hey red as red, red as a burning fire, it symbolizes pure friendship and love.

Why are the flowers so fresh?

Why is it so fresh?

Hey, it's so fresh that it makes people can't bear to leave, it's watered with the blood of youth.

Why are flowers so red?

Why is it so red?

Hey red as red, red as a burning fire, it symbolizes pure friendship and love.

Hey red as red, red as a burning fire, it symbolizes pure friendship and love.

It symbolizes pure friendship and love.

First of all, there is its material basis. Both safflower and red leaves contain anthocyanins that are made from glucose in their cell fluid. When it is acidic, it appears red, and the more acidic it is, the redder it is.

When it is alkaline, it appears blue, and the alkalinity is stronger, becoming blue-black, such as black chrysanthemum, black peony, etc. And when it's neutral, it's purple. Thousands of purples and reds, red and blue, are all anthocyanins shown in different acid-base reactions.

Thank you for the points.

Structure: Total - Minutes - Total.

1) (1) General: Praise the bright beauty of safflowers, and ask the question of "why are flowers so red".

2) (2-10 paragraphs) points: Explain the internal and external reasons why flowers are so red from six different perspectives.

3) (11 paragraphs) General: summarize the reasons for the bonus and summarize the full text.

The blood of heroes stained it red...

The tears of the lover watered it...

The affection of loved ones nourishes it...

The friendship of friends sets it off...

Is it red? It's green, but you're colorblind, ......Well, you give it to me, and I'll say it's red.

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