Kerala Plus Two Biology Question Paper 2025 (7 March), Download PDF (All Sets)

Kerala Plus 2 Biology Exam: Highlights

Highlights of Kerala plus biology exam 2025 are given below table:

Kerala +2 Biology Question Paper 2025: Download PDF

Students can download the detailed solution pdf link by Clicking on the link given below:

Here are the Kerala Plus Two Biology Exam 2025 questions with answer options and correct answers:

1. Decomposition would be fast if the detritus contained:
   (a) Lignin and cellulose
   (b) Lignin and chitin
   (c) Nitrogen and water-soluble sugars
   (d) Chitin and cellulose
   Answer: (c) Nitrogen and water-soluble sugars

2. Name the method in which the alien DNA is directly injected into the nucleus of an animal cell.
   (a) Electroporation
   (b) Gene gun
   (c) Microinjection
   (d) Liposome-mediated transfer
   Answer: (c) Microinjection

3. Population interaction where one species is harmed and the other is unaffected:
   (a) Mutualism
   (b) Commensalism
   (c) Amensalism
   (d) Predation
   Answer: (c) Amensalism

4. If any protein-coding gene is expressed in a heterologous host, the protein formed is called:
   (a) Native protein
   (b) Recombinant protein
   (c) Functional protein
   (d) Denatured protein
   Answer: (b) Recombinant protein

5. Which among the following is a non-albuminous seed?
   (a) Maize
   (b) Wheat
   (c) Castor
   (d) Groundnut
   Answer: (d) Groundnut

6. Tapetum plays an important role in the development of the male gametophyte. Give a reason.
   Answer: The tapetum provides nourishment to the developing pollen grains and secretes enzymes and proteins essential for pollen development.

7. Write any one peculiarity of tapetal cells.
   Answer: Tapetal cells are polyploid and have a dense cytoplasm, which helps in nutrient supply and pollen wall formation.

8. Write the steps in making the bacterial cell competent to take up the recombinant DNA.
   Answer: Treat bacterial cells with a solution of calcium chloride (CaCl₂) to create permeability. Mix the cells with recombinant DNA. Apply a heat shock (at 42°C for a few seconds) to facilitate DNA uptake. Allow the cells to recover in a nutrient-rich medium before plating.

9. Define Gross Primary Productivity (GPP).
   Answer: Gross Primary Productivity (GPP) is the total amount of organic material produced by autotrophs (mainly plants) through photosynthesis in a given area and time.

10. What are the factors affecting primary productivity?
    Answer: Availability of sunlight, temperature, water and nutrient availability, CO₂ concentration, type of vegetation and ecosystem.

11. Apomixis is a blessing to agriculture. Justify the statement with reasons.
    Answer: Apomixis allows the production of genetically identical seeds without fertilization, ensuring uniformity in crops. It helps in maintaining desirable traits in hybrid plants without segregation, leading to higher yields and reduced dependency on hybrid seed production.

12. What is population density?
    Answer: Population density is the number of individuals of a species per unit area or volume of a habitat.

13. List any two ways of measuring the population density of a habitat.
    Answer: Direct counting – Counting all individuals in a given area. Quadrat method – Sampling a small area and extrapolating to estimate the total population.

Kerala Plus Two Biology Questions Paper 2025: Student Reaction

Student found that the paper was well balanced and similar to the model paper which was released by the board during the exam preparation. Questions were doable in the given time frame of two hours while most of the questions were the easy level of difficulty on direct concept-based and some parts were challenging due to the involvement of diagrams and detailed explanations.

Kerala Plus 2 Biology Questions Paper 2025: Exam Analysis

The question paper was very well-structured and had everything that was prescribed in the curriculum and the blueprint of the topic. Those students who had a clear understanding of the topics as well as did regular practice our test paper, could easily handle this paper.

• The paper was built to test the students' good understanding of Biology.
• The paper navigated through both Botany and Zoology parts.
• Topics like Cell Biology, Genetics, Plant Physiology, and Human Physiology are those that will be the main focus area.
• The paper apart from understanding the fundamental principle, students will also demonstrate their ability to apply this knowledge in real-world scenarios.
• The question paper follows the Kerala State Education Board’s syllabus.

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