Discussion
There are two statements marked as Assertion (A) and Reason (R). Mark your answer as per the codes given below :
Assertion (A) : The plasma membrane is selectively permeable.
Reason (R) : It allows all substances to pass freely.
Answer: C
The answer is (A) is true, but (R) is false.
The plasma membrane is selectively (semi-) permeable: its lipid bilayer and transport proteins let some substances, such as water, oxygen and carbon dioxide, pass while controlling or blocking others, such as ions and large molecules.
The Reason contradicts this. A membrane that let all substances pass freely would not be selective at all, so the Reason is false and cannot explain the Assertion. That rules out both options calling the two true and the option calling the Assertion false.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development