Question

What is special about the leaves that plant can synthesis food but other parts of a plant cannot?

Answer 1

Simply we can say that,

The leaves have a special pigment, chlorophyll. Colour of leaves is green because of this chlorophyll. The chlorophyll pigment has the ability to convert sun light into the food by the photosynthesis.

OR

Detailed explanation

The structure of leaf is designed in such a way that food can be prepared , while the other parts lack with it . A leaf can turn food into energy .
Chlorophyll is the molecule in the structure of the leaves that takes the energy in sunlight to turn water and carbon dioxide gas into sugar and oxygen gas.
Leave have chlorophyll while the other lacks .
Leaves are made out of several layers that are in between two layers of super tough skin cells called epidermis. The epidermis is also known to secrete cuticle, which is a waxy substance. All of these layers protect the leaf from pests such as insects and bacteria. There are also stomata cells that are pores where gases can enter and exit through the leaf.
Most of the food production in the leaf actually takes place in the elongated cells that are known as palisade mesophyll inside the leaf. The leaf also has veins that can help to support the leaf by transporting food, water and minerals to the leaf and to the plant.
Leaf has so many such things that other plants do not . So by this you can say the speciality of leaves over other parts of plants.


Hope you satisfied.