a seed contains nutrients a spore dosen't.
granas are stacks of membranes inside a chloroplast that contains chlorophyll .yup that
Grana is stacks of thylakoids that are found in chloroplast.
Obviously you're supposed to put contains when "something contains something else" such as "That jar contains food." then contain in a present tense sentence like "Can you contain your dog, please?"
grana is a part of a plant studied in science and a part of a chloroplast.