Exploring the Science Behind Autumn Leaf Color Change

What happens to the leaves in autumn when the weather cools?

• They change colors.

• They become green.

• They start to bloom.

• They grow larger.

What do trees take in through their roots?

• Oxygen

• Water

• Carbon dioxide

• Sunlight

What is the process called that plants use to make their food?

• Transpiration

• Respiration

• Fermentation

• Photosynthesis

What chemical allows plants to absorb energy from sunlight?

• Oxygen

• Glucose

• Chlorophyll

• Carbon dioxide

What signals the tree that the growing season is ending?

• Stronger winds

• Shorter days and longer nights

• Increase in temperature

• More rainfall

Why do trees stop sending water to the leaves in autumn?

• To produce more chlorophyll

• To increase photosynthesis

• To make the leaves grow faster

• To conserve water

What happens to the chlorophyll in the leaves during autumn?

• It turns into glucose

• It becomes water

• It gets used up

• It increases

What are trees called that lose their leaves every winter?

• Tropical trees

• Evergreen trees

• Deciduous trees

• Coniferous trees

What type of leaves do evergreen trees have?

• Colorful and delicate

• Large and soft

• Small and tough

• Broad and thin

Why can evergreen trees survive in colder climates?

• They grow faster in winter

• Their needles are not damaged by cold

• They store more water

• They have larger leaves