Stroma is ground substance of

Nucleus

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Chloroplast

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Mitochondria

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Endoplasmic reticulum

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Solution

The correct option is B Chloroplast
Stroma can be defined as the colourless fluid present within the chloroplast that surrounds the grana.
Grana is the stack of thylakoids discs arranged in the matrix of chloroplast i.e, the stroma.
The light-independent reactions (Calvin cycle) take place in the stroma.
The chloroplast DNA and ribosomes are present within the stroma.
So, the correct answer is 'Chloroplast'.

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