Q91 (CGS/2026) Geography › World Physical Geography

Consider the following statements :

Statement-I :
The leaves of deciduous forest trees produce brilliant colours in autumn.

Statement-II :
In autumn season, leaves of deciduous forest trees stop producing green chlorophyll pigments.

Which one of the following is correct in respect of the above statements?

Both Statement-I and Statement-II are correct and Statement-II explains Statement-I

Both Statement-I and Statement-II are correct but Statement-II does not explain Statement-I

Statement-I is correct but Statement-II is not correct

Statement-I is not correct but Statement-II is correct

Result

Your answer: — · Correct: A

Explanation

Statement-I is correct: deciduous trees are renowned for their vibrant autumn foliage. Statement-II is also correct and provides the scientific explanation for Statement-I. During autumn, shorter days and cooler temperatures trigger the formation of an abscission layer at the base of the leaf, which restricts the flow of nutrients. This causes the tree to stop producing chlorophyll, the pigment responsible for the green color. As the existing chlorophyll degrades, it unmasks other pigments such as carotenoids (yellow and orange) that were already present but hidden. Additionally, some trees produce anthocyanins (red and purple) as sugars become trapped in the leaves. Because the cessation of chlorophyll production is the primary physiological trigger that allows these brilliant colors to appear, Statement-II correctly explains Statement-I.

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SIMILAR QUESTIONS

Consider the following statements : Statement-I : The temperature contrast between continents and oceans is greater during summer than in winter. Statement-II : The specific heat of water is more than that of land surface. Which one of the following is correct in respect of the above statements?

Statement I : When a piece of brick lying on grass for a number of days is removed, the covered part of the grass appears pale. Statement I : Synthesis of chlorophyll, which gives green pigment, occurs in presence of sunlight.

Consider the following statements : Statement I : Some rare earth elements are used in the manufacture of flat television screens and computer monitors. Statement II : Some rare earth elements have phosphorescent properties. Which one of the following is correct in respect of the above statements?