Shadowing-Übung: Cambridge Ielts 16 Reading test 3 Passage 3 - Englisch Sprechen Lernen mit Video
Lektion wird erstellt...
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Passage 3.
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Plant thermometer triggers springtime growth by measuring nighttime heat.
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A photoreceptor molecule in plant cells has been found to have
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a second job as a thermometer after dark allowing plants to read seasonal temperature changes.
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Scientists say the discovery could help breed crops that are more resilient to the temperatures expected to result from climate change.
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A. An international team of scientists led by the University of Cambridge has discovered
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that the thermometer molecule in plants enables them to develop according to seasonal temperature changes.
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Researchers have revealed that molecules called phytochromes, used by plants to detect light during the day,
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actually change their function in darkness to become cellular temperature gauges that measure the heat of the night.
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The new findings, published in the journal Science, show that phytochromes control genetic switches in response to temperature as well as light to dictate plant development.
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B. At night, these molecules change states, and the pace at which they change is directly proportional to temperature,
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say scientists, who compare phytochromes to mercury in a thermometer.
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The warmer it is, the faster the molecular change, stimulating plant growth.
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Sea farmers and gardeners have known for hundreds of years how responsive plants are to temperature, warm winters cause many trees and flowers to bud early,
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something humans have long used to predict weather and harvest times for the coming year.
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The latest research pinpoints for the first time a molecular mechanism in plants
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that reacts to temperature often triggering the buds of spring we long to see at the end of winter.
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E With weather and temperatures set to become ever more unpredictable due to climate change,
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say the discovery that this light-sensing molecule also functions as the internal thermometer in plant cells could help us breed tougher crops.
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It is estimated that agricultural yields will need to double by 2050, but climate change is a major threat to achieving this.
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Key crops, such as wheat and rice are sensitive to high temperatures.
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Thermal stress reduces crop yields by around 10% for every 1 degree increase in temperature,
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says lead researcher wigger from cambridge's sainsbury laboratory discovering the molecules
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that allow plants to sense temperature has the potential to accelerate the breeding of crops resilient to thermal stress
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and climate change e in their active state phytochrome molecules bind
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themselves to dna to restrict plant growth during the day sunlight activates the the molecules, slowing down growth.
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If a plant finds itself in shade, phytochromes are quickly inactivated, enabling it to grow faster to find sunlight again.
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This is how plants compete to escape each other's shade.
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Light-driven changes to phytochrome activity occur very fast, in less than a second, says Wigger.
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At night, however, it's a different story.
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Instead of a rapid deactivation following sundown, the molecules gradually change from their active to inactive state.
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This is called dark reversion.
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Just as mercury rises in a thermometer, the rate at which phytochromes revert to their inactive state during the night is a direct measure of temperature, says Wigger.
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F. The lower the temperature, the slower the rate at which phytochromes revert to inactivity,
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so the molecules spend more time in their active, growth-suppressing state.
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This is why plants are slower to grow in winter.
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Warm temperatures accelerate dark reversion, so that phytochromes rapidly reach an inactive state and detach themselves from the plant's DNA,
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allowing genes to be expressed and plant growth to resume.
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Wigger believes phytochrome thermosensing evolved at a later stage,
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and co-opted the biological network already used for light-based growth during the downtime of night.
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Gee some plants mainly use day length as an indicator of the season.
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Other species, such as daffodils, have considerable temperature sensitivity, and can flower months in advance during a warm winter. In fact,
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the discovery of the dual role of phytochromes provides the science behind a well-known rhyme long used to predict the coming season, oak before ash we'll have a splash,
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ash before oak we're in for a soak.
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Wigge explains, oak trees rely much more on temperature, likely using phytochromes as thermometers to dictate development,
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whereas ash trees rely on measuring day length to determine their seasonal timing.
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A warmer spring, and consequently a higher likeliness of a hot summer, will result in oak leafing before ash.
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A cold spring will see the opposite.
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As the British know only too well, a colder summer is likely to be a rain-soaked one.
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H. The new findings are the culmination of 12 years of research involving scientists from Germany,
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Argentina, and the U.S., as well as the Cambridge team.
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The work was done in a model system, using a mustard plant called Arabidopsis,
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but Wigger says the phytochrome genes necessary for temperature sensing are found in crop plants as well.
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Recent advances in plant genetics now mean that scientists are able to rapidly identify the genes controlling these processes in crop plants,
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and even alter their activity using precise molecular scalpels, adds Wigger.
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Cambridge is uniquely well positioned to do this kind of research
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as we have outstanding collaborators nearby who work on more applied aspects of plant biology
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and can help us transfer this new knowledge into the field.
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Wortschatz und Sprechhinweise zu dieser Lektion
Diese Sprechübung auf Niveau C1 basiert auf dem Video „Cambridge Ielts 16 Reading test 3 Passage 3“. Diese Wörter kommen am häufigsten vor: plant, temperature, phytochrome, molecule, thermometer. Dieses Video enthält 58 Sätze und 872 Wörter zum Nachsprechen. Der gesprochene Teil dauert 6:07. Der Sprecher spricht gleichmäßig mit etwa 143 Wörtern pro Minute – ein angenehmes Tempo fürs Shadowing. Nur 72 % der Wörter gehören zu den 3.000 häufigsten im Englischen, der Wortschatz ist also anspruchsvoll.
Wichtiger Wortschatz in diesem Video
Die 15 anspruchsvollsten Wörter aus dem Video, mit Aussprache und Bedeutung:
| Wort | Aussprache | Bedeutung |
|---|---|---|
| molecule Substantiv | /ˈmɑ.lɪ.kjul/ | Molekül |
| thermometer Substantiv | /θɚˈmɑ.mɪ.tɚ/ | Thermometer, Wärmemesser |
| inactive Adjektiv | /ɪnˈæktɪv/ | inaktiv, untätig |
| seasonal Adjektiv | /ˈsiːzənəl/ | jahreszeitlich, saisonal |
| breed Verb | /ˈbɹiːd/ | aufziehen, erzeugen |
| resilient Adjektiv | /ɹɪˈzɪl.jənt/ | widerstandsfähig, resilient |
| revert Verb | /ɹɪˈvɝt/ | rückgängig machen |
| dictate Verb | /ˈdɪkˌteɪt/ | diktieren, bestimmen |
| soak Verb | /soʊk/ | durchnässen |
| accelerate Verb | /ɪkˈsɛl.əˌɹeɪt/ | beschleunigen |
| sunlight Substantiv | /ˈsʌnˌlaɪt/ | Sonnenlicht |
| researcher Substantiv | /ˈɹiˌsɝ.t͡ʃɚ/ | Forscher, Forscherin |
| distress Substantiv | /dɪˈstɹɛs/ | Bedrängnis, Elend |
| mercury Substantiv | /ˈmɜɹkjəɹi/ | Quecksilber |
| thermal Adjektiv | /ˈθɜːməl/ | thermisch |
Phrasal Verbs, die du hören wirst
| Wort | Bedeutung |
|---|---|
| slow down Verb | verlangsamen |
Grammatik in diesem Video
Die Strukturen, die der Sprecher am häufigsten verwendet, mit den genauen Worten aus dem Video:
| Struktur | Im Video |
|---|---|
| „Used to“ used to + Verb – eine frühere Gewohnheit oder ein Zustand, der nicht mehr gilt | used to predict |
| Passiv be + Partizip Perfekt – wichtig ist, was geschieht, nicht wer es tut | has been found · is estimated · is called |
| Present Perfect have/has + Partizip Perfekt – eine vergangene Handlung, die jetzt noch wichtig ist | has been found · has discovered · have revealed |
Aussprache, auf die du achten solltest
- Die „th“-Laute: thermometer /θɚˈmɑ.mɪ.tɚ/, thermal /ˈθɜːməl/
- Die Laute „sh“ und „zh“: reversion /ɹɪˈvɚʒən/, culmination /ˌkʌl.mɪˈneɪ.ʃən/, deactivation /ˌdiːæktɪˈveɪʃən/, splash /splæʃ/
- Lange Wörter – auf die Betonung achten: thermometer /θɚˈmɑ.mɪ.tɚ/, accelerate /ɪkˈsɛl.əˌɹeɪt/, collaborator /kəˈlæbəɹeɪtɚ/, culmination /ˌkʌl.mɪˈneɪ.ʃən/, deactivation /ˌdiːæktɪˈveɪʃən/
So übst du mit diesem Video
- Höre dir das ganze Video einmal an, ohne zu sprechen, und notiere die Wörter, die du nicht kennst.
- Sprich Satz für Satz in normaler Geschwindigkeit nach und wiederhole jeden, bis dein Rhythmus zum Sprecher passt.
- Nimm dich auf und vergleiche mit dem Original; achte dabei auf Wörter wie molecule, thermometer, inactive.
Was ist die Shadowing-Technik?
Shadowing ist eine wissenschaftlich fundierte Sprachlerntechnik, die ursprünglich für die professionelle Dolmetscherausbildung entwickelt und durch den Polyglotten Dr. Alexander Arguelles populär gemacht wurde. Die Methode ist einfach aber wirkungsvoll: Du hörst englisches Audio von Muttersprachlern und wiederholst es sofort laut — wie ein Schatten, der dem Sprecher mit nur 1–2 Sekunden Verzögerung folgt. Anders als passives Hören oder Grammatikübungen zwingt Shadowing dein Gehirn und deine Mundmuskulatur, gleichzeitig echte Sprachmuster zu verarbeiten und zu reproduzieren. Studien zeigen, dass es Aussprachegenauigkeit, Intonation, Rhythmus, verbundene Sprache, Hörverständnis und Sprechflüssigkeit signifikant verbessert — was es zu einer der effektivsten Methoden für die IELTS Speaking-Vorbereitung und reale englische Kommunikation macht.