Question

In the fall, the leaves of some trees change color. This happens because chlorophyll breaks down and the accessory pigments become visible. What hormone is responsible for this?
A. phototropin
B. abscisic acid
C. cytokinin
D. ethylene

Answer 1

In the fall, the leaves of some trees change color. This happens because chlorophyll breaks down and the accessory pigments become visible. ethylene is responsible for this.

• The multifunctional phytohormone ethylene is thought to control both growth and senescence. Depending on the concentration, timing, and species of the plant, it either promotes or inhibits the processes of growth and senescence.
• However, the leaves stop producing food in the fall due to changes in temperature and the length of daylight. Chlorophyll decomposes, the green color vanishes, and the yellow to orange hues emerge, contributing to the fall brilliance of the leaves.
• During fruit ripening and leaf senescence, ethylene can promote chlorophyll breakdown.
• One of the most prominent indicators of fruit ripening and leaf senescence is the breakdown of chlorophyll.
• Every autumn, this results in the yellowing of the leaves, and the fruits' changing hue denotes their ripening.

learn more about ethylene here: brainly.com/question/23712323

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