Autumn Leaves (Biology Review)

What is the main factor affecting autumn senescence according to the passage?

• Daylength

• Temperature

• Humidity

• Soil nutrients

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Remembering

Which pigment is responsible for the red/purple color in some autumn leaves?

• Chlorophyll

• Carotenoids

• Anthocyanins

• Phytochrome

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Remembering

During autumn, photosynthesis-related genes are ___ in deciduous plants.

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Understanding

The process of breaking down leaf contents and storing nutrients before shedding is known as autumn ___.

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Understanding

What role do carotenoids play in leaves during autumn?

• They absorb sunlight for photosynthesis

• They protect chlorophyll from sunlight damage

• They store nutrients for winter

• They cause leaves to fall off

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Applying

In which type of climate do evergreen trees thrive according to the passage?

• Temperate

• Boreal

• Desert

• Arctic

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Understanding

The abscission layer forms at the point where each leaf meets the ___.

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Applying

What is a transcription factor?