As the days get shorter and the temperatures drop, chlorophyll production in leaves decreases, leading to a change in color.

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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Quizzes

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