Why Do Leaves Change Colour?

The video explains how leaves change color due to different pigments: chlorophyll, carotene, and anthocyanins. Chlorophyll, responsible for green color, is unstable and breaks down in sunlight, requiring constant renewal. In autumn, chlorophyll production stops, revealing carotene, which gives leaves an orange-yellow hue. Anthocyanins, formed from sugars and proteins, can make leaves appear red. The dominant pigment determines the leaf color, which varies by tree and season.

What is the primary role of chlorophyll in leaves?

• To produce carotene

• To make leaves red

• To convert sunlight into chemical energy

• To stabilize leaf structure

Why do leaves appear green when both chlorophyll and carotene are present?

• Carotene is more abundant than chlorophyll

• Chlorophyll is more abundant than carotene

• Carotene masks the green color of chlorophyll

• Both pigments are equally visible

What pigment is responsible for the orange color in carrots and some autumn leaves?

• Xanthophyll

• Chlorophyll

• Anthocyanin

• Carotene

How are anthocyanins formed in leaves?

• Through the breakdown of chlorophyll

• By reactions between sugars and proteins

• Through water absorption

• By direct sunlight exposure

What determines the color of a leaf at any given time?

• The dominant pigment present

• The type of tree

• The amount of sunlight

• The temperature