As the days get shorter and the temperatures drop, chlorophyll production in leaves decreases, leading to the change in color.
Contents
MCQs
1. What is the primary pigment responsible for the green color in leaves?
A) Carotene
B) Chlorophyll
C) Anthocyanin
D) Xanthophyll
Answer: B) Chlorophyll
Explanation: Chlorophyll is the pigment that gives leaves their green color and is essential for photosynthesis.
2. Which of the following is not a pigment that contributes to the fall colors of leaves?
A) Chlorophyll
B) Carotene
C) Anthocyanin
D) Melanin
Answer: D) Melanin
Explanation: Melanin is a pigment found in animals and humans responsible for hair, skin, and eye color, not leaf color.
3. Why do some leaves turn red or purple in the fall?
A) They are dying
B) Due to the production of anthocyanins
C) Loss of chlorophyll
D) Exposure to sunlight
Answer: B) Due to the production of anthocyanins
Explanation: Red and purple hues in fall leaves are due to the production of anthocyanins, which can occur as chlorophyll decreases.
4. What environmental factor does not directly influence the color change in leaves?
A) Soil pH
B) Temperature
C) Length of night
D) Moisture
Answer: A) Soil pH
Explanation: Soil pH does not directly affect the color change in leaves. Temperature, length of night, and moisture levels are more influential.
5. What happens to the green color of chlorophyll in the fall?
A) It becomes more vibrant
B) It fades away
C) It changes to red
D) It stays the same
Answer: B) It fades away
Explanation: As chlorophyll breaks down and its production decreases, the green color fades, allowing other pigments to become visible.
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