Page 150 - Photosynthesis: The Green Miracle

Chloroplasts filling mes-
ophyll plant cells seen
Mesophyll cell under a microscope.
Chloroplast

(a)
Grana

Stroma
Stroma Inner membrane
lamella Basic-tissue
Thylakoid lamella Outer membrane

Photosystems

(b)

The green chloroplasts in a plant’s cells are where
photosynthesis takes place. Chloroplasts absorb
sunlight to be used in photosynthesis. Their struc-
tures resemble interconnected balloons (top right)
The pictures show the components involved in
photosynthesis: a) The location of the grana in-
side the chloroplast. The grana resemble discs
piled on top of one another, and form through
the coming together of flat, sac-like structures
known as thylakoids. b) A general view of the
green particles in the thylakoid membrane.
c) Image of these particles in the thylakoid, (c)
seen under an electron microscope.