Tree Physiology and Leaf Changes

The video explores the changes in leaf colors during autumn, explaining the role of chlorophyll and other pigments in this process. It discusses the difference between evergreen and deciduous trees, and how seasonal changes lead to the vibrant colors of fall. As days shorten, chlorophyll production decreases, revealing other pigments. Eventually, leaves fall as trees prepare for winter, storing energy until spring. The video encourages viewers to appreciate the beauty of autumn leaves.

What natural changes signal the arrival of autumn?

• Longer days and warmer weather

• Shorter days and cooler weather

• More rainfall and thunderstorms

• Increased humidity and fog

What is the primary role of chlorophyll in leaves?

• To store water for the plant

• To give leaves their red color

• To capture sunlight for energy

• To protect leaves from insects

Which pigment is responsible for the green color in leaves?

• Carotenoids

• Anthocyanins

• Chlorophyll

• Xanthophylls

Why don't we see the red, yellow, and orange pigments in leaves during spring and summer?

• They are not present in the leaves

• They are covered by the green chlorophyll

• They are washed away by rain

• They are only produced in autumn

Which of the following is NOT a pigment found in leaves?

• Hemoglobin

• Chlorophyll

• Carotenoids

• Anthocyanins

What happens to chlorophyll production as days get shorter?

• It increases

• It remains the same

• It decreases

• It stops completely

Why do leaves eventually fall from trees in autumn?

• They are cut off by the tree

• They are eaten by animals

• They are blown away by the wind

• They no longer have chlorophyll to make energy

What happens to the energy made by leaves as winter approaches?

• It is stored in the tree

• It is lost

• It is converted to water

• It is used immediately

What marks the beginning of a new cycle for trees after winter?

• The growth of new leaves

• The falling of old leaves

• The shedding of bark

• The blooming of flowers

What should you do if you find a particularly beautiful leaf?

• Press it in a book

• Paint it

• Take a picture and email it

• Throw it away