Plant meteorologists read the answers.

Plants not only provide people with oxygen and fruits, but also can forecast the weather. In the production process, people have observed the law of some plants predicting the weather.

Forecast rainy weather

When the weather is clear, the shoots of pumpkin vines grow upward. If the pumpkin vines are found drooping, it is a sign that the weather is turning to rain; If the pumpkin vines turn from drooping to upturning in the continuous rainy weather, it means that the rainy weather is coming to an end and the sunny weather is coming. Why can pumpkin vines predict the weather? It turns out that when the weather changes, pumpkins are sunny and cloudy, which is a characteristic formed during the evolution of pumpkins in order to better adapt to the weather and protect themselves.

Rain grass grows in the dense forest of Xishuangbanna, China, and can forecast wind and rain. Its flowering habit is very special, and there is no fixed time. But every two or three days before the storm comes, its small and exquisite flowers will bloom. Moreover, after the storm, its blooming becomes more and more neat and bright, as if only after the baptism of the storm can it show its true colors.

When the weather is clear, you touch the petiole of mimosa with your finger, and the leaves will close immediately, but will soon return to normal. If the leaves droop and close naturally, it is a sign of rainy weather.

In the Andes of Peru, there is a kind of peculiar "rain flower", the petals are tight and seamless, and the water absorption and air permeability are very weak. So whenever the air pressure is low and the water vapor density in the air is saturated before it rains, the dew at the lower part of the stamens disappears. This phenomenon shows that sunny weather is about to pass and rainy day is coming. Therefore, local residents call this kind of flower "sunny and rainy flower".

In hot summer, a small cloud of water will come out at the junction of leaves and stems of thatched grass, just like crabs spitting, so the folk have summed up the agricultural proverb "thatched stalks spit and work in the rain tomorrow".

When the air humidity is high, the scales of pine cones will shrink, which is when it is reported that it will rain soon. When the air is dry, the scales of pine cones will open, which indicates that the weather is about to turn from rainy to sunny. Before the rainstorm, the air pressure dropped sharply and the water surface pressure decreased. At this time, the moss at the bottom of the river will surface, so the farmer said, "When the river is covered with moss, it will rain heavily."

Predicted temperature

In southern Sweden, there is a kind of grass called "Tricolor Ghost", which is called a natural thermometer because it is extremely sensitive to temperature changes. Above 20 degrees Celsius, its leaves extend obliquely upward; If the temperature drops to 15 degrees Celsius, the branches and leaves will move down until they are parallel to the ground. When the temperature drops to 10 degrees Celsius, the branches and leaves bend downward. If the temperature rises to its original state, the leaves will return to their original state.

Chestnut trees are not only sensitive, but also can predict the weather. After winter, when frost or snowy weather is predicted, it will germinate several weeks in advance. Studies have proved that chestnut trees can predict the arrival of severe winter after perceiving the length of night time.

In the northeastern province of China, farmers like to plant Guizijiang in front of their houses or behind their fields and pickle pickles with its tubers. According to observation, Guizijiang can accurately predict the first frost, which falls about 10 day after flowering, reminding farmers to prepare for frost prevention and antifreeze.

Question:

1. Summarize the main content of this article in one sentence.

2. In what ways does this article show that some plants can predict the weather?

3. Can the word "some" in the sentence "people have observed the laws of some plants predicting the weather in the process of production and life" be deleted? Why?

4. In the part of "Forecasting rainy weather", what two explanations did the author use?

5. In the part of "Predicting temperature", the author said that in Sweden, people call a kind of grass called "Tricolor Ghost" a "natural thermometer". What does this mean?

Answer:

1, plants not only provide people with oxygen and fruits, but also can forecast the weather.

2, it is explained from the state and activity of plants.

No, because not all plants can predict the weather.

4, for example, analogy

5. Explain that the grass of Tricolor Ghost can forecast the weather.