Answer:
The correct answer would be b. photosynthesis.
The plants usually grow throughout their lifespan with the help of meristematic cells. They have a potency to divide throughout the lifespan of the plants.
However, for cell division and cell growth plants need energy and organic matter.
The source of energy that is, sugar or glucose is provided by the process of photosynthesis.
It is the process by which plants synthesize glucose from carbon dioxide with the help of sunlight and chlorophyll.
