Question

name the organelle which has the structure called cisterns . mention any two function of this organelle

Answer 1

It is Endoplasmic reticulum 
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it Functions : 

@ synthesis of protein and fats 

@ provide structure to the protoplasm 

Answer 2

cisterns are present in Chloroplasts


Functions of chloroplast
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The function of chloroplast is to hold the light energy for the process of photosynthesis. In this process, plants can use carbon dioxide, water and oxygen to produce light energy by a product.