Cell membrane is selectively permeable, while cell wall is freely permeable. RER has ribosomes attached, while SER lacks them. Chloroplasts contain green chlorophyll, while chromoplasts have red, yellow or orange pigments.
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Both mitochondria and chloroplasts have double membranes, DNA and ribosomes. Mitochondria release energy by respiration, while chloroplasts produce food by photosynthesis. Thus, they are similar in structure but different in function.
The correct answer is (ii) Mitochondria and Nucleus because both contain DNA. Other options are incorrect since ribosomes, Golgi bodies and lysosomes do not contain DNA.
Improper mitosis can cause uncontrolled cell division, forming tumours. Faulty meiosis can lead to genetic disorders, abnormal chromosome numbers or reproductive problems in organisms.
If skin cells divide by meiosis, they would produce cells with half the chromosome number. This would disrupt normal repair and the cut would not heal properly.