NEET BIOLOGY

Detailed explanation-1: -But in the fall, because of changes in the length of daylight and changes in temperature, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves part of their fall splendor.

Detailed explanation-2: -The chlorophyll breaks down and the green fades away, letting the yellow/orange carotenoids blaze forth, giving autumn its splash, dash and panache. At the same time, other chemical changes occur, giving rise to more pigments which vary from yellow to red to blue.

Detailed explanation-3: -As the weather cools in autumn, the leaves start to receive less sunlight. Less sunlight triggers chlorophyll to break down (and the tree does not replenish it) revealing the new, colourful pigments underneath and treating us to beautiful autumn yellows and oranges.

Detailed explanation-4: -Cold nights: low temperatures destroy chlorophyll so the green leaf fades to yellow, but if temperatures stay above freezing, anthocyanin production is enhanced and the leaves take on a red colour.

Detailed explanation-5: -Chlorophyll (green) is sequentially broken down into fluorescent catabolites (blue) including FCC, which is converted to FDCC by CYP89A9 (red). FCC and FDCC are non-enzymatically converted into non-fluorescent catabolites (black) NCC and NDCC, respectively.