Shadowing Practice: Cambridge Ielts 16 Reading test 3 Passage 3 - Learn English Speaking with Video

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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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Bu dersin kelimeleri ve konuşma notları

Bu C1 seviyesindeki konuşma dersi “Cambridge Ielts 16 Reading test 3 Passage 3” videosuna dayanıyor. En çok tekrarlanan kelimeler: plant, temperature, phytochrome, molecule, thermometer. Bu videoda gölgeleme çalışması için 58 cümle ve 872 kelime var. Konuşma bölümü 6:07 sürüyor. Konuşmacı dakikada yaklaşık 143 kelimelik dengeli bir hızla konuşuyor; gölgeleme için rahat bir tempo. Kelimelerin yalnızca %72’i İngilizcede en sık kullanılan 3.000 kelime arasında, bu yüzden kelime dağarcığı zorlayıcı.

Bu videodaki önemli kelimeler

Videodaki en ileri düzey 15 kelime, telaffuzu ve anlamıyla:

KelimeTelaffuzAnlam
molecule isim/ˈmɑ.lɪ.kjul/molekül
thermometer isim/θɚˈmɑ.mɪ.tɚ/sıcaklıkölçer, termometre
inactive sıfat/ɪnˈæktɪv/aktif değil, çalışmıyor
resilient sıfat/ɹɪˈzɪl.jənt/dirençli, elastik
dictate fiil/ˈdɪkˌteɪt/dikte etmek
accelerate fiil/ɪkˈsɛl.əˌɹeɪt/hızlandırmak
sunlight isim/ˈsʌnˌlaɪt/güneş ışığı
researcher isim/ˈɹiˌsɝ.t͡ʃɚ/araştırmacı, araştırıcı
distress isim/dɪˈstɹɛs/bun, kaygı
mercury isim/ˈmɜɹkjəɹi/cıva
predict fiil/pɹɪˈdɪkt/öngörmek, tahmin etmek
culmination isim/ˌkʌl.mɪˈneɪ.ʃən/doruk, zirve
daffodil isim/ˈdæfəˌdɪl/nergis
nighttime isim/ˈnaɪtˌtaɪm/gece
scalpel isim/ˈskælpəl/neşter

Duyacağınız deyimsel fiiller

KelimeAnlam
slow down fiilyavaşlamak

Bu videodaki dil bilgisi

Konuşmacının en çok kullandığı yapılar, videodaki sözcüklerin aynısıyla:

YapıVideoda
Edilgen yapı be + fiilin üçüncü hâli — kimin yaptığı değil, ne olduğu önemlihas been found · is estimated · is called
Present perfect have/has + fiilin üçüncü hâli — geçmişte olan ama şimdi de önemli olan bir eylemhas been found · has discovered · have revealed

Dikkat edilecek telaffuzlar

  • “th” sesleri: thermometer /θɚˈmɑ.mɪ.tɚ/, thermal /ˈθɜːməl/
  • “sh” ve “zh” sesleri: reversion /ɹɪˈvɚʒən/, culmination /ˌkʌl.mɪˈneɪ.ʃən/, deactivation /ˌdiːæktɪˈveɪʃən/, splash /splæʃ/
  • Uzun kelimeler — vurguyu doğru yere koyun: thermometer /θɚˈmɑ.mɪ.tɚ/, accelerate /ɪkˈsɛl.əˌɹeɪt/, collaborator /kəˈlæbəɹeɪtɚ/, culmination /ˌkʌl.mɪˈneɪ.ʃən/, deactivation /ˌdiːæktɪˈveɪʃən/

Bu videoyla nasıl çalışılır

  1. Videonun tamamını konuşmadan bir kez dinleyin ve bilmediğiniz kelimeleri not edin.
  2. Normal hızda cümle cümle tekrar edin; ritminiz konuşmacıyla aynı olana kadar her cümleyi yineleyin.
  3. Kendinizi kaydedin ve orijinaliyle karşılaştırın; molecule, thermometer, inactive gibi kelimelere özellikle dikkat edin.

Gölgeleme Tekniği Nedir?

Gölgeleme, başlangıçta profesyonel tercüman eğitimi için geliştirilen ve çok dilli Dr. Alexander Arguelles tarafından popüler hale getirilen, bilim destekli bir dil öğrenme tekniğidir. Yöntem basit ama güçlüdür: ana dili İngilizce olan bir sesi dinler ve hemen yüksek sesle tekrar edersiniz — konuşmacıyı 1-2 saniye gecikmeyle takip eden bir gölge gibi. Pasif dinleme veya dilbilgisi alıştırmalarının aksine, gölgeleme beyninizi ve ağız kaslarınızı gerçek konuşma kalıplarını eşzamanlı olarak işlemeye ve yeniden üretmeye zorlar. Araştırmalar, telaffuz doğruluğu, tonlama, ritim, bağlı konuşma, dinleme anlama ve konuşma akıcılığını önemli ölçüde geliştirdiğini göstermektedir — bu da onu IELTS Konuşma hazırlığı ve gerçek dünya İngilizce iletişimi için en etkili yöntemlerden biri yapar.

Shadowing tekniği: adım adım eksiksiz rehberi okuyun →