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Chloroplasts contain a fluid material called the stroma, this is where light independent reactions take place, so contain enzymes needed for it,
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What is chloroplast
Chloroplast are the organelles where photosynthesis takes place
What happens in photosynthesis
The energy from light is used to react carbon dioxide with water to form oxygen and the carbohydrate glucose
The energy trapped in photosynthesis is now contained within the chemical bonds in the glucose molecule
What are the two sets of reactions in photosynthesis
The light dependent reactions use chlorophyll to harvest light energy, the energy is then transferred into the chemical bonds of other molecules such as ATP.
Light independent reaction is where glucose is formed. They do not require light, and take place during both light and dark conditions.

What are key features of chloroplast
They have a double membrane , they control what molecules leave and enter the chloroplast.
Thylakoids on different grana are connected together by flattened membranes called lamellae. These play a role in the light dependent reactions , and allow chemicals to pass between the grana.
Starch is stored in the chloroplast as starch granules (glucose can be converted to starch)
Chloroplassts contain loop of DNA, contains genes which encode some of the proteins needed for protein synthesis
Contains ribosomes, synthesise proteins encoded by chloroplast DNA

What are thylakoids
Inside chloroplast, we find membrane bound flattended discs, they are called thylakoids, and this is where light dependent reactions take place. So they contain chlorophyll and enzymes needed for light dependent reactions
Whats granum / grana
Thylakoids are stacked on top of each other, this stack is called a granum . By stacking thylakoids into grana, light can be absorbed more efficiently.
Whats lamellae
Thylakoids on different grana are connected together by flattened membranes called lamellae. These play a role in the light dependent reactions , and allow chemicals to pass between the grana.
Whats stroma
Chloroplasts contain a fluid material called the stroma, this is where light independent reactions take place, so contain enzymes needed for it,