Autumn Leaves (Biology Review)

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

• Chlorophyll

• Carotenoids

• Anthocyanins

• Phytochrome

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Remembering

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

• Temperate

• Boreal

• Desert

• Arctic

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Understanding

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

• Daylength

• Temperature

• Humidity

• Soil nutrients

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Remembering

The abscission layer forms at the point where each leaf meets the (a)   .

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Applying

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

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

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Understanding

During autumn, some photosynthesis-related genes are (a)   in deciduous plants.

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Understanding

What is a transcription factor?

Answer explanation

A transcription factor is a protein that controls gene expression by binding to specific DNA sequences, called promoter regions, to either initiate or inhibit the transcription of a gene into messenger RNA (mRNA). These proteins act as regulators, with activators promoting gene expression and repressors inhibiting it, allowing cells to respond to environmental cues and hormonal signals.  

Which type of separation technique could help identify the different pigments in leaves?

(a)