sunflower

There are many kinds of flowers in the world, such as Magnolia grandiflora, Chinese rose, rose, plum blossom, chrysanthemum, Clivia, camellia and so on. However, the flower with the most flowers and the richest colors belongs to the sunflower. As the saying goes, "good flowers don't bloom often." Sunflower is also a good flower, including red, yellow, white, purple, crimson and orange ... Sunflower petals are single-layered, shaped like plum blossoms, with a red core and yellow spots on black filaments. Sunflower stems are long and thin, soft and curved. It has thin branches, dense leaves and many flowers.

Sunflowers only bloom when they see the sun. Every day when the sun rises slowly from the east, sunflowers are scrambling to open their smiles. When the breeze blows away, the sunflower "shakes its head", as if reading a poem and nodding to pedestrians. The flower bones of sunflowers are red and the shape is the size of soybeans. Unlike other flower bones, they are short and round.

Sunflower seeds are surrounded by several small leaves. Flower seeds are as big as sesame seeds. When the seeds of small flowers are ripe, they are scattered in Grandpa Earth's arms. After being nourished by sunshine and rain, they can grow more beautiful sunflowers in the second year.

Sunflowers are full of vitality. She sucks the nectar that Grandma Blue Sky gave her and greedily absorbs the nutrition of Grandpa Earth. Sunflowers thrive under the care of Grandpa Earth and Grandma Blue Sky, making the motherland more beautiful and adding icing on the cake to the beautiful nature.

Sunflowers at night are like a child playing all day, tired and gratified to enter a sweet dream.

Morning glory is also a good flower. It blooms early and fails late. It and sunflower seem to be a pair of good sisters. They agreed to open up together, enter the sweet dream country together, not early or early, and decorate this beautiful nature together. They give themselves selflessly and never ask for the return of the motherland or the appreciation of the people.

Although sunflower is not as noble as rose, as fragrant as chrysanthemum, as pure and elegant as Magnolia grandiflora and as fragrant as plum blossom, it has the spirit of selfless dedication.

I love sunflower, its tenacious and vigorous vitality, and I love its selfless dedication.

Plants-daffodils

I always lived in my grandmother's house when I was a child. At that time, many beautiful flowers were planted in grandma's yard. There are winter jasmine and peony flowers in spring; There are sunflowers and crab claw lotus in summer; There are chrysanthemums and a bunch of red flowers in autumn, wintersweet and daffodils in summer.

Among them, I like daffodil best, its appearance and its "heart" better. Although not as charming as peony, not as red as sunflower, not as attractive as chrysanthemum, not as intoxicating as wintersweet. But daffodils are slender and graceful, and daffodils are clean and clear. There is a bigger reason: "daffodils are tenacious."

Narcissus is known as "Ling Boxian". Indeed, its moving posture makes people fall in love at first sight.

Those daffodils in grandma's house are very beautiful.

In January, daffodils are in full bloom! Its emerald-like green leaves are green and bright. Among the criss-crossing green leaves, there are several white and flawless flowers embedded with a golden stamen, which exudes a faint fragrance and looks particularly elegant. Narcissus has nothing to do with soil, and rain flower stone is its "soil". I think: I want my mind to be as pure and white as it is, without any sludge. Daffodils have roots like big onions, with white roots below. They are like earthworms growing around hard raindrops, very stubborn.

A gust of wind blew, and Xiaohua shook her head and her soft body. It's like dancing on the water stone in a crystal dress, which makes people relaxed and happy.

In winter, many flowers can't stand the test of cold and fate-wither. However, daffodils are not afraid. When it is freezing and snowy outside, it stands proudly, still full of vitality and vitality, as if fighting against the cold wind, perseverance, making people love it more and more.

I love narcissus! Love its beauty and fragrance, love its nobility and purity, love its tenacity and unyielding!

2.300-word essays on popular science of plant growth

The Growth Process of Soybean Once I started the experiment of "Soybean Growth Process".

I'll prepare transparent plastic cups, dirt, paper towels and soybean seeds first. Then spread paper towels around the cup and put more than half of the soil in the cup. Then, I put some seeds between the cup and the tissue.

Finally, I crushed a small part of the remaining mud and put it in a cup (the seeds are about one centimeter deep from the surface), and poured some water to make the paper towel completely wet. So the seeds were planted.

A few days later. I came to the windowsill to observe the seeds.

I found the color of the seeds changed a little. Originally, the color of the seed was big yellow, but after these days, the appearance of the seed was a little light and it felt a little transparent. The seeds are particularly full and the seed coat is a little cracked.

Two days have passed. I went to the windowsill again to observe the seeds.

I looked into the cup. To my surprise, the seeds germinated.

The shell of the seed cracked. Buds are drilled from the inside, and the color of buds is light yellow with a little cyan.

The top of the bud is pointed and looks very tender. This is the bud head. The bud head grows downward.

There is a question in my mind: why does the bud of a seed grow down? Isn't this impossible to drill out? I thought about it and watered it. The next day, I came to the window platform again to observe the seeds.

Through my observation. Seeds change greatly now and when they germinate.

When it germinated, the seed shell just broke, and now most of it has fallen off. I really want to help it peel off all the shells.

The real small leaf bud in the seed has left its original position and is close to the outside. Two trees emerged from the soil. Originally it was closed, but now it is scattered, with a small bud in the middle. I also found that each bud has two leaves, which look furry like a love shape.

A few days later, I came to the windowsill again. There were many small green bean sprouts in the cup. I also found that its leaves are two opposite pieces.

Now we know why the new bud of this seed grows downward. That's because it's not a bud, but a root, so it should grow down.

When I came to the windowsill again to observe, the soybean had changed from a seed to a bean sprout, and then it grew up slowly from the bean sprout.

Now there is a soybean seedling wrapped around security window to help him grow. This soybean seedling is also the fastest growing one. Although growing soybeans is small, it is a good start for me to experience plant growth.

3. Scientific knowledge of plants is written down in the form of a diary.

654381Monday, October 7, the weather cleared up, took root and blossomed! The floor of my balcony has taken root and blossomed! More than a year ago, my mother moved a small plant from a colleague, with only seven or eight leaves. It is said to be a cash cow.

Dad looked it up on the Internet, and it turned out that its name had taken root. This potted flower is not as good as Screaming Trees's. Fleshy leaves are like pieces of jasper, green, and there are some purple patterns on the back of the leaves. There is a circle of flapping butterfly buds around the big leaves. Dad said that every bud can take root and sprout when it falls into the soil, and its vitality is extremely tenacious, so it is called rooting and sprouting! I left my pie mouth and said, Rooting is such a corny name! Mom thinks it's more appropriate to call it a cash cow. You see, shake the leaves and the buds will fall down one after another. Isn't it like a cash cow? Last year 1 1 month, I suddenly found that the leaves did not grow upward, but drooped downward. A thin branch appeared at the top, and a flower bone slowly opened at the top of the branch. At first, people didn't care much about the size of a small grain of rice, because they never thought that this green tree would bloom and gradually become like a soybean.

After New Year's Day, my mother suddenly found that the cash cow was blooming. The flower is shaped like an inverted golden bell, and also like a purse peony. The flower bones on each branch are strung into a string, and at the same time, many flowers can be produced and hung like palace lanterns. Although these flowers are not as eye-catching as peony flowers, they will be full of surprises even if they bloom, but they can withstand tasting. Lilacs bow their heads shyly, as if they were a gentle and shy little jasper girl, but the more they look, the more beautiful they are.

Neighbor grandma also likes to take root in the ground. She told me that rooting on the ground is still a Chinese herbal medicine for clearing away heat and toxic materials. When she was a child, she lacked medical care and medicine. Everyone ran into it, burned it and bled, so she picked a few leaves and applied them externally. When she gets angry, she gets boils with toothache and sore throat, so she picks a few leaves to eat, which is useful. Rooted in the ground, I like the humid environment, but occasionally I forget to water it. It is still alive and well, and has not stopped growing. It just quietly emits some air roots to absorb water from the air. Really a good boy who is self-reliant and independent.

The buds on the edge of the leaves are arranged neatly and fall off at the touch. When they meet the soil, they will soon grow white fibrous roots and become new individuals. The falling buds fell on the floor tiles of the balcony and withered due to lack of water. I picked them up, put them in the soil of the flowerpot and watered them. They all came alive. The tender roots are rooted in the soil, and the vitality is too strong. I finally understand why it is called taking root. This name is too appropriate. Just like tenacious China people, they can stand firm and take root in the world by their own efforts.

4. A scientific composition on observing plants (100 words)

Those daffodils in grandma's house are very beautiful.

In January, daffodils are in full bloom! Its emerald-like green leaves are green and bright. Among the criss-crossing green leaves, there are several white and flawless flowers embedded with a golden stamen, which exudes a faint fragrance and looks particularly elegant. Narcissus has nothing to do with soil, and rain flower stone is its "soil". I think: I want my mind to be as pure and white as it is, without any sludge. Daffodils have roots like big onions, with white roots below. They are like earthworms growing around hard raindrops, very stubborn.

A gust of wind blew, and Xiaohua shook her head and her soft body. It's like dancing on the water stone in a crystal dress, which makes people relaxed and happy.

I love narcissus! Love its beauty and fragrance, love its nobility and purity, love its tenacity and unyielding!

What do you like? I like the lotus pond in summer.

In early summer, lotus leaves stick out their bright yellow heads from the water. In midsummer, the bright green lotus leaves turn into big green plates, which are covered with lotus ponds. Not to be outdone, Lotus poked its pink head out of the mud. Although they grow from mud, these flowers are so pure and lovely! It's really muddy but not stained! Some lotus flowers are half lying in the water; Some are half-open; Some lotus flowers produce small bright yellow lotus flowers. . Lotus is so beautiful that people can't see everything!

In the morning, whenever the lotus leaves pass by the lotus, the lotus always makes the wind mother-in-law bring fragrance to people. The lotus leaf is covered with crystal dew, which ticks from time to time. It was the sound of a small dewdrop jumping into the water. The fish danced around the lotus, lotus leaf. Little dewdrop is a loyal audience of fish. Dew drops into the water, which is the audience's applause for the fish. Seeing such scenery, I really want to play with them, so I must.

5. Write some scientific knowledge, such as animals, life and plants.

One day in the summer vacation, the sun was blazing and the weather was extremely sultry.

Grandpa and I go to the gym to play ball by bus. After playing a game, my clothes were soaked. Grandpa told me to take off my coat. Wipe your aunt with a wet towel.

Really, my body is much cooler and my brain is much clearer. I asked grandpa, why is this? Grandpa said I'll tell you when I get home.

After playing the ball, my grandfather and I went home. Grandpa said we should do an experiment: bring a pot of tap water and take the thermometer off the wall. Grandpa asked me, "What's the temperature now?" When I saw it, it was "37℃". Grandpa put the thermometer into the water and saw the mercury column descending slowly.

Grandpa asked again, "What will happen to the mercury column if the thermometer is taken out of the water?" "Rising, of course," I dragged on. Grandpa smiled and said nothing. He took out the thermometer from the water and showed it to me. However, due to medical treatment, the mercury column did not rise, but fell, and it only rose after a while.

I'm confused. Grandpa said: "When the thermometer is taken out of the water, there are many small drops of water on the surface, which need to absorb heat when evaporating." .

So the thermometer dropped and the water evaporated before it rose. "It suddenly dawned on me:" Wet towels wipe your body and there is water on you. The water evaporated and absorbed the heat on my body, so I dared to cool down. "How interesting! Science is everywhere in real life.

6. How to write scientific knowledge about plants?

Seed germination conditions: sufficient water, suitable temperature and sufficient oxygen.

1. Sufficient moisture: The moisture content of dry seeds is low, generally only accounting for 5%~ 10% of the total weight of seeds, which makes all physiological activities very weak. Only by absorbing enough water to make the seed coat swell and soften can oxygen easily penetrate and breathing be enhanced. Generally, seeds can germinate only by absorbing 25%~50% or more of their own weight, such as rice 40%, wheat 50%, cotton 52%, soybean 120% and pea 186%.

Second, the appropriate temperature: different plant seeds have a certain optimal temperature for germination. Above or below the optimum temperature, germination will be affected. When the optimum temperature exceeds a certain limit, only a part of seeds can germinate, and the temperature in this period is called the highest temperature; When the temperature is lower than the optimum temperature, the seeds germinate slowly, and only a small part barely germinates when it reaches a certain limit. The temperature in this period is called the lowest temperature.

3. Sufficient oxygen: Generally, seeds need more than 10% oxygen in the air to germinate normally. Seeds with more fat need more oxygen than seeds with more starch. When the oxygen content drops below 5%, most seeds cannot germinate. Such as cotton, peanut or its ta crop seeds, usually cannot germinate when completely immersed in water or buried in soil. Mainly because of lack of oxygen. Therefore, manual management should be strengthened in the process of sowing and soaking seeds. In case of rain after sowing, we should pay attention to loosening the soil and controlling oxygen supply to make the seeds germinate normally.

7. Write a scientific essay about plants (less than 500 words): "Why are leaves?

One morning, I saw my mother watering the flowers and asked her, "Mom, if you water them, the flowers will grow.". Why? " "Son, this is because the roots of plants are conveying nutrients to flowers!" However, after listening to my mother, I still don't quite understand. When my mother saw that I still didn't understand, she said to me, "Never mind, how about I give you a little experiment?" When I heard that I was going to do the experiment, I danced with joy and shouted, "Good! You did a good job. I like doing experiments best! " We have prepared blue ink, plasticine, a plant with white flowers, dropper, marker, cup and water. My mother said to me, "Be careful not to break the cup!" " ""sure! "I promise that the experiment has begun. My mother put the water in the cup first, and then I sucked the red ink out with a dropper and dropped it into the cup filled with water. Then, my mother dipped the plant with white flowers and roots into the water. Suddenly, the bottom of the root began to turn red. I sealed the cup with plasticine, and my mother finally marked it with a marker. It was Ok! Mom added: "Remember to observe again in a week." "Yes!" I cried. I am so looking forward to it! Even in my dream, I am doing a story about this experiment. Time flies, and a week has passed quickly. Today, the truth will come out! I'm so happy. As soon as I arrived at the experimental cup, I saw that the flowers turned red and there was less water in the cup. The last step is to cut the stem, so mother carefully cut off the stem of the plant with a knife. Wow! The stem suddenly turned red, and so did the root! It's amazing! Mother said: "The reason why flowers turn red is because the stems of plants transport water and nutrients, and the roots of plants absorb water and nutrients. "It is this sentence that makes me understand that those flowers will grow, which is the role of stems and roots, and also the role of water. Now I fully understand. Do you know the man sitting here? .

8. Ask for a scientific essay to introduce some animals and plants, or introduce some scientific knowledge.

Memory has always been regarded as a unique function of organisms, especially higher organisms. However, materials scientists found in their research that some metals also have memory function.

In the 1960s, researchers in the US Naval Ordnance Laboratory made a NiTi alloy wire with 55% nickel and 45% titanium. They wound this nickel-titanium alloy wire into a spiral coil, heated it to 150℃, and then cooled it and straightened it. When the alloy wire was heated to 95℃ again, an incredible scene appeared-the wire automatically curled into the shape of the original spiral coil. The researchers cooled it and straightened it again, but when heated to the same temperature, it would return to its original shape. Repeat the experiment again and again.

Later, scientists discovered other alloys, such as Cu-Zn-Al alloy, Cu-Ni-Al alloy and Fe-Pt alloy. , also has the function of this shape memory. They call these alloys "shape memory alloys".

This alloy with shape memory function can be widely used in satellite antenna, aircraft hydraulic system, pipe riveting, medical equipment and many other fields. For example, antennas made of them are usually folded very small. When the spacecraft is in the sky, the antenna will expand into a hemisphere with a diameter of several meters under the irradiation of sunlight; Artificial bone tie rods made of them can rely on human body temperature to assemble and fix broken bones, which greatly speeds up the speed of fracture healing.

9. Composition of Plant Science Discovery

1 weeping willow by the pond There is a hunchbacked old weeping willow by my pond.

The trunk of this old weeping willow is as straight as other weeping willows in the backyard. Why humpback? Mom said: One day ten years ago, the sky was overcast, a gust of wind blew, and then it rained heavily.

The weeping willow stood as strong as a soldier with open arms to block the wind and rain. The wind blows harder and harder, and it rains harder and harder. Suddenly, there was a loud noise and the weeping willow fell down.

The weeping willow tree fell into the pond, and its main root broke and stuck out of the ground, but it did not die and survived tenaciously. The remaining half of it is firmly stuck in the soil, guiding the "body" to be firmly fixed.

Its "belly" immersed in water has produced many red whiskers, absorbing water and nutrients from the water. Its submerged branches and leaves are exposed to the water again and continue to grow upwards.

Ten years later, this old weeping willow has grown into a hunchbacked trunk, but its branches and leaves are still flourishing. Next to the old weeping willows, there is a row of small weeping willows, which my father planted on the branches of weeping willows with his talent.

Small weeping willows, with strong stems and thick leaves, grow with old weeping willows on the edge of my pond, which has become a beautiful scenery in my home. My family has morning glory, aloe and chlorophytum, among which I like aloe best.

The stem of aloe vera is thick and strong. The blade bends downward, and there are many triangular serrations on the edge of the blade. All the leaves grow alternately, and none of them overlap.

There is a film on the leaves. When you open it, you can see that the meat inside is very thick and juicy, and it is slippery and sticks to your face. It has red, white and yellow flowers.

It is not afraid of drought, even if there is not a drop of water in the soil, it can live because its leaves are full of water. I like aloe because aloe can diminish inflammation. Can be used for treating tracheitis and pharyngitis.

If someone suffers from these diseases or injuries, they can treat them with aloe. I water it every two weeks. Check whether aloe vera is dry when you go home every day. When I saw the green smile of aloe, I said to it, "Little aloe, are you thirsty?" Little Aloe seemed to hear what I said and replied, "Little master, go and do your homework. I am not thirsty. "

If you are tired of your homework, you can go to see the flowers and loosen the soil for them, so you will not be so tired. When it is sick, I will give it plenty of water and tell it, "Don't be afraid, be strong, and you will be fine."

It seems to say, "little master, I will be fine, don't worry." Once I was sick, too. It seemed to say to me, "Don't be afraid, young master. If you have confidence in yourself like me, you will be fine. "

The indomitable spirit of aloe inspires me. When I encounter difficulties in my life and study, I will think of the spirit of aloe, stubbornly overcome difficulties and face life bravely. Today, my mother bought some beans. She used up some useless things. I want to soak them and see what happens to them.

I first found three cups, one for water and the other two for red beans: mung beans and plum beans. I pour a third of the water into the first cup and the rest into the second cup.

I also put some cotton under the first cup, but the water without cotton in the second cup seems to turn yellow at once. Bean skin is hard in the morning and soft in the afternoon.

The next day, the first cup of mung bean has sprouted, with a length of1mm. Yesterday, mung beans were dark green, but today they are light green. Red beans have turned pale red, but they haven't germinated yet. The mung bean in the other cup hasn't germinated yet.

In the afternoon, the first cup of mung beans is 5 mm long, and the second cup of mung beans is still only 1 mm long. I thought it was very strange, so I looked for relevant books to read. I finally understand that plants can't grow well without temperature and humidity. If a mouse stays in the water for about two minutes, it will die, as will people and plants.

Through this observation, I learned that plants can't grow well without humidity and temperature.