ISC Class 12th Biology Answer Key 2025: The ISC Class 12th Biology Exam was held today. To help the students assess their performance, we have provided the ISC Class 12th Biology Answer Key 2025 in this article. Subject experts have prepared the answer key and serve as an important resource for students to cross-check their answers and estimate their scores. The answer key allows students to learn from their mistakes and improve their preparation for future exams.
Check| ISC Class 12th Biology Question Paper 2025 (All Sets)
Check| ISC Class 12th Biology Paper Analysis 2025 (All Sets)
ISC Class 12th Biology Exam Answer Key- Highlights
| Feature | Highlights |
| Board Name | Council for the Indian School Certificate Examinations |
| Exam Name | ISC Class 12th Biology Exam |
| Exam Date | March 21st, 2025 |
| Duration | 10:30 AM to 1:30 PM (3 hours) |
| Total Marks | 70 |
| Mode | Offline (Pen and Paper) |
| Time Duration | 3 Hours |
Features Of ISC Class 12th Biology Answer Key 2025
- Provides solutions: The answer key provides solutions to all the questions in the exam, including multiple choice questions, short answer questions and long answer questions.
- Format of the question paper: The answer keys are often provided in a question-wise format that details each question with the correct answer.
- Easily accessible: The answer keys are easily accessible so that the students can estimate their total scores.
ISC Class 12th Biology Answer Key 2025
Students can get the answer key for ISC Class 12th Biology exam 2025. The exam ended by 5 pm. Along with the answers, students can also get the question paper and detailed exam analysis.
Question 1
(i) A sportsperson quenched his thirst by drinking some tender coconut water. Name the part of the fruit from where the liquid content is derived.
Answer: Endosperm
(ii) In a particular ecosystem, there were 1000 species at a given time. After 5 years, 200 more species were added. Calculate the growth rate of the population.
Answer: Growth rate = 0.2
(iii) Rachel attained puberty at the age of fourteen years. She conceived for the first time at the age of thirty years. How many primary oocytes did she lose till the time of conception?
Answer:
(iv) How many nuclei are present in the central cell of the mature embryo sac of angiosperms before fertilization?
Answer: Two nuclei (Polar nuclei)
(v) A woman's first child suffered from Down’s syndrome. During her second pregnancy, she wanted to find out whether her second child would be normal or not. Which method will the gynaecologist adopt to test the genetic abnormality in the embryo?
Answer: Amniocentesis or Chorionic Villus Sampling (CVS)
(vi) Derive a name for a restriction endonuclease that was extracted from the 5th order from the RY13 strain of E. coli.
Answer: EcoR V
(vii) A pistillate flower of a tetraploid angiosperm is pollinated by a pollen grain from a staminate flower of a diploid plant. What would be the level of the ploidy in the endosperm of seeds thus formed?
Answer: Pentaploid (5n)
(viii) Observe the relationship between the first two words/terms and then fill in the fourth word/term.
Lipase: Candida lipolytica :: Taq polymerase: _______________
Answer: Thermus aquaticus
(ix) The capacitation of sperms plays a significant role in the process of fertilization in humans. Which of the following events are associated with the process of capacitation?
I. Large quantity of Ca²⁺ ions enter the sperm to enhance the permeability of the acrosome.
II. Antifertilisin reacts with the fertilisin protein.
III. Membrane covering the sperm head and acrosome gets removed.
Options:
(a) I and II only
(b) I and III only
(c) II and III only
(d) I, II, and III
Answer: (b) I and III only
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