ISC Class 12 Biology Question Paper with Answer Key 2026: PDF Download, Exam Analysis
ISC Class 12 Biology Answer Key 2026 will help you to predict your total. The answer key will be available here once the exam is over on March 6, 2026, after 5:00 PM. You can check your raw scores with the help of the answer key provided here.
ISC Class 12 Biology Answer Key 2026 will be available on March 6, 2026, after 5:00 PM. You can use the answers present in the unofficial answer key to predict your expected score. Accurate answers to the questions asked during the exam will be mentioned in the answer key. As per theISC Passing Marks for Class 12th 2026, the minimum passing marks for the ISC Class 12 are 40%, which are to be scored individually in both theory and practical papers. You can check the unofficial ISC Class 12 Biology Answer Key 2026 below.
ISC Class 12 Biology Unofficial Answer Key 2026
As soon as the ISC Class 12 Biology paper is over, we will update you with the unofficial answer key based on the research done by our experts:
Section A: 20 Marks
| Questions | Answers |
|---|---|
| Section A: Multiple Choice Questions | |
| (1) Zara is suffering from a cough and has bluish lips. Her mucus is mixed with blood. What is the biological name of the causative organism responsible for Zara's condition? | Pneumonia |
| (2) Observe the relation between the first two words and complete the analogy: Dengue: Aedes :: Plague: | Xenopsylla |
| (3) If the number of chromosomes in the cells of the calyx is 16, how many chromosomes will be formed in the endosperm after double fertilisation? | 24 |
| (4) A scientist isolates a second restriction endonuclease from the strain DC3 of Helicobacter pyogenes. What would the scientist name it using the standard naming technique of restriction enzyme? | HpyDCII |
| (5) Meenu is suffering from a genetic disorder in which phenylpyruvic acid and its lower metabolites accumulate in blood. It causes impairment of nervous tissues. Which enzyme deficiency has caused this disorder in Meenu? | Phenylalanine hydroxylase (PAH) |
| (6) There were 770 frogs in a pond. 70 of them died within a month. Calculate the death rate of the population of frogs in the pond. | 0.09 = 9% |
| (7) A farmer notices that the leaves of his cabbage plants are curling up because of heavy infestation of aphids. Suggest one eco-friendly method to control their spread in their cabbage plants. | Biological control using natural wings. Ladybugs (Ladybird beetles) or Lacewings |
| (8) In a particular plant with bilobed dithecous anther, there were 50 Pollen Mother Cells. Only 25% could develop their pollen tubes. Calculate the number of pollen grains that would proceed for fertilisation. | 50 |
| (9) Choose the components required for the proper functioning of DNA Polymerase enzyme. | (b) Only (P), (R), and (S) |
| (10) The left hind limb of a person was swollen like an elephant's limb. Which one of the following was MOST likely the cause of swelling? | (c) Blockage of Lymph Vessels |
| (11) Given below are two statements marked Assertion and Reason. Read the two statements carefully and choose the correct option: Assertion: RNAi technique is applied to plants and animals to protect them from pest infestation. Reason: This technique inhibits the expression of certain genes in pests. | (a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion. |
| (12) Given below are two statements marked Assertion and Reason. Read the two statements carefully and choose the correct option. Assertion: Individuals with Klinefelter syndrome lose their secondary sexual characters and develop gynecomastia. Reason: The presence of the XXY chromosomal pattern leads to underdeveloped testes and reduced testosterone levels in affected males. | (C) Assertion is True and Reason is False |
| (13) In a garden pea plant, the flowers are in axial (A) position. Find out the proportion of flowers in terminal position (a), if a cross is made between two heterozygous plants. | 25% |
| (14) Name the autoimmune disorder that affects the skeletal muscles in humans. | Myasthenia Gravis |
Section B: 14 Marks (2 marks each)
Question No. | Answer Key |
2 | To be updated |
3 | To be updated |
4 | To be updated |
5 | To be updated |
6 | To be updated |
7 | To be updated |
8 | To be updated |
Section C: 21 Marks (3 marks each)
Question No. | Answer Key |
9 | To be updated |
10 | To be updated |
11 | To be updated |
12 | To be updated |
13 | To be updated |
14 | To be updated |
15 | To be updated |
Section D: 15 Marks (5 marks each)
Question No. | Answer Key |
16 | To be updated |
17 | To be updated |
18 | To be updated |
ISC Class 12 Biology Question Paper Pattern 2026
The latest Biology question paper pattern has been discussed below:
- The Biology exam will be conducted for 70 marks, and 30 marks are allotted for the practical work.
- There are four sections in the paper: A, B, C, and D. Internal choices have been provided in one question each in Sections B, C, and D.
- Section A consists of one question, each carrying one or two marks.
- Section B consists of seven questions, each carrying two marks.
- Section C consists of seven questions, each carrying three marks.
- Section D consists of three questions, each carrying five marks.
ISC Class 12 Biology Passing Marks 2026
The minimum passing marks for ICSE Class 12 Biology are 40%. You are required to score at least 40% marks in theory and then 40% marks in the practical paper separately. The theory paper in Biology will be conducted for 70 marks, while 30 marks are allotted for the practical exam. Only those who get the minimum passing marks in both papers will be eligible to be promoted and will get the marksheet and other certificates. No grace marking is provided in ISC. Those who are not able to get the passing marks will have to sit for improvement exams.
ISC Class 12 Biology Result 2026
The result for ICSE is expected to be released in April 2026. You can find the result on the official website of CISCE at cisce.org. The result will have important information regarding the subject-wise marks that you have scored in the exam. The grades and grade points that you have achieved in the exam will also be included in the result. After the result is released, you can find the original marksheet in your respective schools. Make sure to collect your originalISC Board Class 12 Marksheetas soon as possible to continue your admissions to colleges.
ISC Class 12 Biology Improvement Exam 2026
For those who are unable to secure the minimum passing marks in the initial exams, improvement exams will be conducted by CISCE. You can apply for the improvement exams with the help of your teachers or fill out theISC Class 12 Improvement Exam Form 2026online as soon as it is released. You can appear for the improvement exam for a maximum of two subjects. The improvement exams are usually conducted in June or July. The application is to be filled a right after the declaration of the result.
ISC Class 12 Biology Improvement Result 2026
After the improvement exams are over, theISC Class 12th Improvement Result 2026will be published online. You can find the result on the official website of CISCE at cisce.org. The improvement result will include information about the subject for which you have appeared for the improvement exam and the number of marks that you have achieved in that subject. A new and updated marksheet will be available for those who have appeared for the improvement exam, which can be collected through the respective school authorities as soon as it is available.
ISC Class 12th Result 2026will be released in May 2026. You can find the result on the official website of CISCE. However, before that, you can check your expected scores with the help of the unofficial answer key provided above.