Assertion: chloroplast's photosystem | /r/HasProperty | embedded in membranous sacs
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Source sentences:
text: They contain chlorophyll , the green pigment necessary for photosynthesis to occur, and associated accessory pigments ( carotenes and xanthophylls) in photosystems embedded in membranous sacs, thylakoids (collectively a stack of thylakoids are a granum [plural = grana] ) floating in a fluid termed the stroma .