Stick The Picture of Granna or Thailecoid.Explain The Both.
Inside the chloroplasts are stacks of discs called thylakoids. They are sac like structures. Thylakoids consists of a thylakoid membrane surrounding a thylakoid lumen. The thylakoid membrane is the site of the light-dependent reactions of photosynthesis with the photosynthetic pigments embedded directly in the membrane and they act to trap the energy from sunlight.
A granum (plurl grana) is a stack of thylakoid discs. Chloroplasts can have from 10 to 100 grana. Grana are connected by intergranal lamellae. Grana contribute to chloroplasts' large surface area to volume ratio.