Why Leaves Change Color in the Fall

The video explains why leaves of deciduous trees change color in the fall. It highlights the role of chlorophyll in maintaining green color during warm seasons and how its reduction in autumn reveals yellow, orange, and red hues. The change is influenced by shorter days, cooler temperatures, and weather conditions. The brightness of fall colors depends on tree type and environmental factors, with frost having minimal impact.

What characteristic defines deciduous trees?

• They have leaves that fall off annually.

• They do not change color in the fall.

• They have needles that stay on year-round.

• They grow only in tropical climates.

What is the primary reason for the change in leaf color during autumn?

• Increased rainfall.

• Higher temperatures.

• Shorter days and longer nights.

• Increase in chlorophyll production.

What role does chlorophyll play in leaves during the warm seasons?

• It turns sunlight, water, and carbon dioxide into food.

• It makes the leaves turn red.

• It helps the tree shed its leaves.

• It prevents the leaves from changing color.

Which factor does NOT influence the brightness of fall colors?

• Type of tree.

• Presence of frost.

• Amount of rainfall.

• Height of the tree.

How does cooler autumn air affect the color of leaves?

• It helps create a red color.

• It prevents any color change.

• It makes the leaves fall off immediately.

• It enhances the green color.