Science for kids

​Topic: Photosynthesis & Transpiration

​Why is the upper surface of a leaf more green & shiny then the lower surface?

​Have you ever wondered why the upper surface of a leaf is more shiny then the lower surface? Well, today we're going to learn why. If you don't believe me, check it!

I was right, wasn't I? Now let's learn why: You must be aware that Chlorophyll, which helps the plant to prepare food, is responsible for the green colour of the leaf. Then why is the upper surface more green then the lower surface? This is because the upper surface of the leaf is more exposed to sun compared to the lower surface. Hence, to trap maximum sunlight, there is more Chlorophyll on the upper surface as compared to the lower surface. Wait! don't answer the questions right now! Let's learn why is the upper surface more green: It is due to the process called 'Transpiration'. Transpiration is the loss of water from leaves, stems, etc. in the form of water vapour. Now, to make sure that the plant does not lose a lot of water. The leaves are covered with a shiny, waxy coating called a Cuticle. But being more exposed to the sun, the upper surface will tend to lose more water. Therefore, the upper surface of the leaf is covered with a thicker Cuticle as compared to the lower surface. Hence, the upper surface of a leaf is shinier then the lower surface. Now, answer the questions:

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THANK YOU​