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CBSE Class 12 Biology Answer Key 2023CBSE Biology Answer Key 2023: For PCB or PCMB students, the biology paper marks the end of their CBSE board exam 2023. The exam for biology was conducted on Thursday, March 16, 2023, in the usual regular shift of 10:30 AM to 1:30 PM. CBSE 12th biology paper which is set for 70 marks has a weightage of 12 marks for MCQs and 4 marks for assertion-reason questions while the rest of the paper is descriptive. CBSE biology answer key is now being posted here while a comprehensive assessment and student analysis of the paper is available below:
CBSE Class 12 Biology Answer Key 2023
As stated above, CBSE 12th biology answer key 2023 for multiple paper sets will be given here. As the same questions are shuffled in the sub-sets, you can simply refer to the answer key given here and cross-check the answers with your respective sub-sets.
| Section A | |||
|---|---|---|---|
| Q.No. | QP Code: 57/3/3 | QP Code: 57/5/2 | QP Code: 57/5/3 |
| 1. | (c) Point Q | (c) Viral infected cells | (d) Haemophilius influenzae : Blockage of the internal passage |
| 2. | (a) Perisperm | (d) Haemophilius influenzae : Blockage of the internal passage | (d) (i) and (iv) |
| 3. | (b) Most fertile days: 10 - 17, Least fertile days: 21 - 28 | (c) K cal m-2 yr-1 | (c) Mutualism |
| 4. | (a) Ferns | (c) X - Suspensor (2n), Y - Cotyledon (2n), Z - Radicle (2n), U - Plumule (2n). | (d) 5' C - T - G - C - A, G 3', 3' G, A - C - G - T - C 5' |
| 5. | (c) S35 | (b) (A)-(ii), (B)-(i), (C)-(iv), (D)-(iii) | (a) Phenylalanine, Methionine |
| 6. | (b) Individual 1 and 2 | (b) Neanderthal man | (c) (ii) and (iv) |
| 7. | (c) (iii) only - Step 'R' is an extension of DNA in presence of thermostable DNA polymerase. | (a) Phenylalanine, Methionine | (d) (A)-(ii), (B)-(iv), (C)-(i), (D)-(iii) |
| 8. | Invalid options | (c) Mutualism | (d) Active immunity |
| 9. | (a) (i) and (iv) only | (d) (i) and (iv) | (c) K cal m-2 yr-1 |
| 10. | (b) Jaintia Hills in Meghalaya | (c) Amphibian | (c) X - Suspensor (2n), Y - Cotyledon (2n), Z - Radicle (2n), U - Plumule (2n). |
| 11. | (a) (ii), (iii), and (iv) only | (d) 5' C - T - G - C - A, G 3', 3' G, A - C - G - T - C 5' | (a) 10-100 times faster |
| 12. | (a) Convergent evolution | (d) (A)-(ii), (B)-(iv), (C)-(i), (D)-(iii) | (b) Neanderthal man |
| 13. | (a) Both (A) and (R) are true and (R) is the correct explanation of A. | (d) (A) is false, but (R) is true. | (d) (A) is false, but (R) is true. |
| 14. | (b) Both (A) and (R) are true but (R) is not the correct explanation of A. | (d) (A) is false, but (R) is true. | (d) (A) is false, but (R) is true. |
| 15. | (d) (A) is false, but (R) is true. | (d) (A) is false, but (R) is true. | (d) (A) is false, but (R) is true. |
| 16. | (a) Both (A) and (R) are true and (R) is the correct explanation of A. | (c) (A) is true, but (R) is false. | (c) (A) is true, but (R) is false. |
CBSE Class 12 Biology 2023 Analysis: Student Reviews
The major highlights of today’s paper and the feedback of the students & subject teachers are discussed below:
- Students have rated the paper as 'Easy to Moderate'.
- The students expressed that while they found most of the paper to be easy, they found Section C to be tough and Section E (case-based questions) to be tricky.
- "Moderate and scoring," is how a Delhi student rated today's paper. "There were many direct NCERT questions which made the paper easy. But the application-based questions were a bit complex. Overall, it was a balanced paper."
- "It was easier than expected. There were no questions on molecular basis," another student commented. "I'd rate the paper as easy. I even found the case-based questions to be easy. MCQs were the easiest. It was a very good paper and not lengthy either. I expect to score above 68 marks."
- "Previous years' questions were repeated. I would say the paper was moderate. I found Section B and Section D to be a bit tougher than the rest."
CBSE Class 12 Biology Core Question Paper Analysis 2023
A comprehensive analysis for the following-listed aspects is updated here. The assessment considers the opinions of the students as well as the professional evaluation of today's paper.
| Parameter | CBSE 12th Biology Analysis 2023 |
|---|---|
| Overall difficulty level of the paper | Easy to Moderate |
| Difficulty level of multiple-choice questions (Section A) | Easy |
| Difficulty level of assertion-reason questions (Section A) | Easy |
| Difficulty level of Section B (very short answer questions) | Moderate |
| Difficulty level of Section C (short answer questions) | Moderate |
| Difficulty level of Section D (long answer questions) | Moderate |
| Difficulty level of Section E (case-based questions) | Easy to Moderate |
| Was the paper lengthy? | No |
| Overall expected good score | 60+ |
