Karnataka 2nd PUC Biology Question Paper 2025 (18 March) – Download Solution PDF for All Sets

Highlights of Karnataka 2nd PUC Biology Question Paper 2025

Given below are the important dates of Karnataka 2nd PUC Biology Exam 2025 along with details:

Karnataka 2nd PUC Biology Question Paper 2025: Download PDF

Candidates who wrote the Karnataka 2nd PUC Biology Exam 2025 on March 18, 2025, may now get the Karnataka 2nd PUC Biology Exam 2025 paper PDF download with solution for reference and practice. The Karnataka 2nd PUC Biology Exam 2025 paper will help future students to know the pattern of the exam, the nature of questions, and the marking scheme.

Some questions that have come in the Karnataka 2nd PUC 2024 Biology are as follows:-

1. At what stage of pregnancy does the production of milk in human females begin?

a) First month

b) Second month

c) Third month

d) Fifth month

Answer: d) Fifth month

Explanation: The production of milk in human females, also known as lactogenesis, begins around the fifth month of pregnancy due to the influence of prolactin and other hormones. However, the actual secretion of milk occurs only after childbirth when oxytocin stimulates milk ejection.

2. After ovulation, the secondary oocyte is covered by which non-cellular layer?

a) Cumulus oophorus

b) Corona radiata

c) Zona pellucida

d) Cortical layer

Answer: c) Zona pellucida

Explanation: The zona pellucida is a glycoprotein-rich non-cellular layer that surrounds the secondary oocyte after ovulation. It plays a crucial role in sperm binding and fertilization. The zona pellucida ensures species-specific fertilization by allowing only the sperm of the same species to penetrate.

3. Which of the following is an example of a hormone-releasing intrauterine device (IUD)?

a) Lippes loop

b) Multiload 375

c) Progestasert

d) CuT

Answer: c) Progestasert

Explanation: Progestasert is a hormone-releasing intrauterine device (IUD) that releases progesterone to prevent pregnancy. It thickens cervical mucus, making it difficult for sperm to enter the uterus. Unlike Copper-T (CuT), which uses copper ions, Progestasert works hormonally to inhibit fertilization.

4. Which of the following is a matching pair?

a) Streptococcus pneumoniae – Monoclonal antibody

b) Saccharomyces cerevisiae – Ethanol

c) Trichoderma polysporum – Cyclosporin A

d) Clostridium butylicum – Lactic acid

Answer: c) Trichoderma polysporum – Cyclosporin A

Explanation: Cyclosporin A is an immunosuppressant drug produced by Trichoderma polysporum, a type of fungus. It is widely used in organ transplantation to prevent the body's immune system from rejecting the transplanted organ. Other options listed do not correctly match the organism with its product.

5. What is the role of Oxytocin during childbirth?

a) Prevents uterine contractions

b) Stimulates uterine contractions

c) Inhibits milk production

d) Promotes embryo implantation

Answer: b) Stimulates uterine contractions

Explanation: Oxytocin is a hormone released by the posterior pituitary gland that plays a key role in childbirth (parturition). It stimulates strong uterine contractions, which help in the expulsion of the fetus. It is also responsible for milk ejection during breastfeeding.

Karnataka 2nd PUC Biology Answer Key 2025

The official answer key for the Karnataka 2nd PUC Biology Exam 2025 will be released by KSEAB in April 2025. Students can access the answer key to cross-check their responses and estimate their scores before the official results are announced. The answer keys will be available for download on the official KSEAB website.

How to Calculate Marks Using the Answer Key

To estimate your score use the answer key:

1. Download the official Biology answer key from the KSEAB website.

2. Compare your responses with the correct answers provided in the key.

3. For each correct answer, award yourself the designated marks as per the marking scheme.

4. Sum up the total marks to get an estimate of your score.

Preparation Tips for Karnataka 2nd PUC Biology Exam 2025

• Understand the Syllabus: Familiarize yourself with the complete syllabus to ensure all topics are covered.

• Practice Regularly: Solve previous years' question papers and model papers to build confidence and improve time management.

• Revise Thoroughly: Regular revision is crucial for retaining concepts and performing well in the exam.