Choose the correct statements regarding cell organelles and their inclusions. A. The endomembrane system includes Golgi complex, endoplasmic reticulum and mitochondria. B. Rough endoplasmic reticulum bears ribosomes on its surface. C. Both mitochondria and plastids have circular DNA. D. A network of microtubules, microfilaments and intermediate filaments present in the cytoplasm is called cytoskeleton. E. Mitochondrion is a single membrane-bound structure. Choose the correct answer from the options given below :

Solution & Explanation

Answer: (D) B, C and D only Solution: B is true (RER bears ribosomes on its surface), C is true (both mitochondria and plastids contain circular DNA), and D is true (the cytoskeleton is a network of microtubules, microfilaments and intermediate filaments). A is false because the endomembrane system excludes mitochondria, and E is false because the mitochondrion is a double-membrane-bound structure. Thus B, C, D are correct, option (4). NCERT Reference: Ch 8, p.95, lines 41-42: "endoplasmic reticulun bearing ribosomes on their surface is called rough endoplasmic reticulum (RER)"; p.98, lines 45-47: "network of filamentous proteinaceous structures consisting of microtubules, microfilaments and intermediate filaments present in the cytoplasm is collectively referred to as the cytoskeleton"; p.96, line 51: "Each mitochondrion is a double membrane-bound structure".