1 . Scientists have known for years that plants respond to sounds around them. For example, flowers make sweeter nectar (花蜜) to the sound of buzzing bees. But now scientists in Israel have shown that plants also seem to be doing some “talking”.
Professor Lilach Hadany and her team at Tel Aviv University set up microphones to record tomato and tobacco plants under different conditions. Their recordings showed that the plants made ultrasonic (超声波的) sounds.
When the researchers adjusted their recordings so that humans could hear them, they heard sharp clicking noises. Plants clicked hardly at all when they had enough water. But as their soil got drier, they clicked more and more. When scientists cut off a stem (茎) from the plants, the plants also clicked more. But the clicking wasn’t the same as when the plants needed water.
It’s not clear how the plants make the sounds and whether the plants are making the sounds on purpose. But the plants are definitely making noises, and creating much more noises when they’re stressed (not enough water, stem cut off) than when they’re not.
The researchers trained an Artificial Intelligence (AI) system to identify the different kinds of clicking sounds. The system was able to tell the difference between plants that needed water and plants with cuts about 70% of the time. The result suggests that researchers may one day be able to use a plant’s sounds to figure out when it is having trouble, and what trouble it is having. That could be very helpful to farmers.
The new discovery raises many more questions. One important question is: Do plants make sounds to communicate with each other? Other research has shown that plants do seem to communicate in some ways. Plants being attacked by insects send chemicals into the air. Soon, nearby plants (that haven’t been attacked yet) start to make other chemicals that don’t taste good to insects. It’s possible that the ultrasonic sounds could work in a similar way.
1. What do the researchers find in their recordings?| A．Plants’ stems click less when they are cut off. |
| B．Plants click harder if they have enough water. |
| C．Plants make more noises when they are thirsty. |
| D．Flowers make sweeter nectar to the sound of bees. |
| A．There are still some unknown issues. |
| B．Not all of them are able to make sounds. |
| C．There are ultrasonic sounds around them. |
| D．They make less noises when they’re stressed. |
| A．To help farmers drive away insects. |
| B．To identify people who are in trouble. |
| C．To show the growing process of plants. |
| D．To distinguish types of clicking sounds. |
| A．Methods for plants to protect themselves. |
| B．Other questions raised by the new finding. |
| C．When plants communicate with each other. |
| D．Under what conditions plants attract insects. |
2 . Kew Gardens is not only a popular tourist destination in London, but also a botanic garden and a research center that has the largest collection of living plants at a single site. So, let’s explore the Royal Botanic Gardens with CGTN’s reporter Robyn Dwyer.
Palm House
The first stop is the Palm House, a giant indoor rainforest with a wide range of plants. Visitors can enjoy these exotic plants while researchers can study the secrets of these flora. Eatable plants such as cocoa tree and African oil palm are all preserved here to keep the diversity of food resources. At the same time, it houses many medical use plants, including some that are used to treat cancer.
Temperate House
Known as the world’s largest Victorian glasshouse, the Temperate House is home to1,500 species of plants from temperate regions of the world. Some of the species kept here have gone extinct in the wild, such as Encephalartos woodii, a cycad from South Africa. And some are already extinct like Saint Helena olive, but the Kew has stored its DNA.
Mediterranean Garden
In the Mediterranean Garden, one can see plants from the Southern Europe, such as rosemary, olives and cork oak. Walking in the garden, one can feel the non-indoor vibe (氛围) of the Mediterranean and learn about the economic as well as scientific uses of these plants.
On International Day for Biological Diversity this year, join CGTN to travel around the world’s national parks and reserves across seven continents. Our next program is to visit penguins and seals in the Antarctic Ice Aquarium Norway. Please stay tuned!
1. What do the three stops have in common?| A．They store plants for medical use. |
| B．They have plants of economic value. |
| C．They house plants of seven continents. |
| D．They own plants for scientific research. |
| A．Palm House. | B．Temperate House. |
| C．Antarctic Ice Aquarium. | D．Mediterranean Garden. |
| A．A botanic dictionary. | B．A TV travel series. |
| C．A trip advertisement. | D．A biodiversity essay. |
