Concept:Both the nucleus and chloroplasts are membrane-bound organelles in plant cells.
Explanation:Plant cells are eukaryotic cells.
The nucleus is enclosed by a double membrane called the nuclear envelope.
It contains pores (nucleopores) to allow passage of proteins and nucleic acids.
Chloroplasts are also surrounded by a double membrane envelope.
They have an additional internal thylakoid membrane system.
Chloroplasts contain their own extranuclear DNA, making them semiautonomous like mitochondria.
Thus, both the nucleus and chloroplasts are separately enclosed by their own membranes.
Option A is wrong because the nucleus does need a membrane.
Option C is wrong because chloroplasts also have a membrane.
Option D is wrong because both are membrane-bound.
Answer:Option B is correct.
