Kerala SSLC Biology Question Paper 2025 (26th March): Exam Analysis, Pattern, Solutions

Kerala SSLC Biology Paper 2025: Highlights

Biology is one of the key subjects for the Science stream for those who aim to study medicine, pharmacy, biotechnology, or environmental sciences in the future. It will help students in competitive examinations like the NEET, forensic sciences, KEAM, and more. Some of the major highlights of the SSLC Biology exam are:

Kerala SSLC Biology Question Paper 2025 PDF

After the completion of the exam, students can download the Kerala SSLC Biology Question Paper 2025 PDF from this page. This will help the students review the biology paper and will help students analyze the exam pattern, question types, and topic distribution. Keep visiting this page for the latest updates that will help you better prepare for the Kerala SSLC board exam.

Kerala SSLC Biology Answer Key 2025

The Kerala SSLC Biology Complete Answer Key 2025 will be available soon, which will help students to verify their responses and estimate their scores. The biology answer key will include solutions for multiple-choice, short-answer, and long-answer questions. The unofficial biology answer key will follow the official SSLC Kerala syllabus and marking scheme. Stay tuned for updates.

11. Explain the role of each of the following activities in defence mechanism.

(a) Lysosomes combine with a membrane sac during the process of phagocytosis.

• Phagocytosis is a process where immune cells (such as macrophages and neutrophils) engulf and digest pathogens like bacteria and viruses.

• Lysosomes contain hydrolytic enzymes that break down these pathogens when they fuse with the membrane sac (phagosome).

• This prevents infection by destroying harmful microbes and removing cellular debris.

(b) Chemicals produced by white blood cells increase body temperature.

• White blood cells release pyrogens in response to infections.

• Pyrogens reset the body's thermostat in the hypothalamus, leading to an increase in body temperature (fever).

• Fever helps in defence by:

  • Slowing down the growth and reproduction of pathogens.

  • Activating immune responses by increasing the efficiency of white blood cells.

12. Analyse each of the given situations and explain how variations are formed in the offspring.

(a) During the initial phase of meiosis, chromosomes pair.

• In prophase I of meiosis, homologous chromosomes pair up and undergo crossing over.

• During crossing over, exchange of genetic material occurs between chromatids of homologous chromosomes.

• This leads to genetic recombination, creating unique genetic variations in offspring.

(b) Parents' chromosomes reach their offspring through gametes.

• Gametes (sperm and egg) are formed through meiosis, where each gamete receives a unique combination of chromosomes.

• During fertilisation, the fusion of gametes results in a new combination of genes, leading to genetic diversity.

• This inheritance of different genetic traits from both parents contributes to variations in offspring.

Kerala SSLC Biology Analysis 2025

• Overall Difficulty – The exam was moderately difficult, with a mix of straightforward and tricky questions.
• Question Types – It included MCQs, theory-based questions, diagrams, and assertion-reasoning questions.
• Numerical Section – The numerical questions (20 marks) were lengthy, requiring good time management.
• Conceptual Understanding – Assertion-reasoning questions needed deep conceptual clarity, making memorisation alone insufficient.
• Syllabus Coverage – The exam followed the SCERT syllabus, though it included some higher-order thinking (HOTs) questions.
• Theory vs. Numerical – Theory-based questions were easier compared to previous years, while numerical problems took more time.
• Time Management – Students who practised past papers found it easier to complete the exam on time.
• Performance Factor – Strong conceptual understanding and problem-solving skills were key to scoring well.

You may also check:

• Kerala SSLC Exam Pattern
• Kerala SSLC Maths Question Paper 2025
• Kerala SSLC Physics Question Paper 2025
• Kerala SSLC Chemistry Question Paper 2025