The Kerala Plus Two Biology Exam 2025 was held as per the schedule set by the Directorate of Higher Secondary Education (DHSE), Kerala. This exam is a crucial milestone for Class 12 students, as it plays a significant role in shaping their higher education prospects. The paper tested students' understanding of core Biology concepts.
A thorough analysis of the question paper reveals a well-structured exam that adhered to the prescribed syllabus and blueprint. Students who had a strong conceptual grasp and practiced numericals regularly found the paper manageable. With the release of the official question paper and answer key, students can now review their responses and estimate their scores, aiding in better preparation for future competitive exams.
Kerala Plus Two Biology Exam 2025 Question Paper
Students can check the Kerala Plus Two Biology Exam 2025 Question Paper shortly here.
Kerala Plus Two Biology Question Paper 2025
Kerala Plus Two Biology Exam 2025 Answer Key 2025
Now that the paper is over, students might be waiting for the answer key. The answer key helps the students to estimate their total score. Students can check the answers by subject experts below:
1. Decomposition would be fast if the detritus contains
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.
Answer: Microinjection
3. Population interaction where one species is harmed and the other is unaffected:
Answer: Amensalism
4. If any protein-coding gene is expressed in a heterologous host, the protein formed is called
Answer: Recombinant protein
5. Which among the following is a non-albuminous seed?
Answer: Groundnut
6. (a) 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.
6. (b) 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.
7. 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.
8. (a) 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.
8. (b) What are the factors affecting primary productivity?
Answer:
- Availability of sunlight
- Temperature
- Water and nutrient availability
- CO₂ concentration
- Type of vegetation and ecosystem
9. 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.
10. (a) What is population density?
Answer: Population density is the number of individuals of a species per unit area or volume of a habitat.
10. (b) 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.
11. Match the following:
| Column A | Column B |
| 1. ADA deficiency | Gene therapy |
| 2. Human α-lactalbumin | Rosie |
| 3. ELISA | AIDS |
| 4. α-1 Antitrypsin | Emphysema |
12. The most spectacular and evolutionarily fascinating examples of mutualism are found in plant–animal relationships. Elucidate with examples.
Answer:
Mutualism is a type of symbiotic relationship where both species benefit from each other. Examples include:
- Pollination by insects: Bees obtain nectar from flowers while helping in pollination.
- Lichen: A mutualistic association between algae and fungi. The algae provide food, and the fungi offer protection.
- Mycorrhizae: Association between plant roots and fungi where fungi help in nutrient absorption, and plants provide food.
13. Give suitable terms for the following:
(a) A technique in plant biotechnology in which two different plant protoplasts are fused to create a hybrid with desirable traits from different varieties of plants.
Answer: Somatic Hybridization
(b) Genetically identical plants obtained by micropropagation.
Answer: Clones
14. The species facing competition might evolve mechanisms that promote co-existence rather than exclusion. Evaluate the statement.
Answer:
This statement is based on the Competitive Co-existence Theory. Instead of one species eliminating another, species may evolve adaptations to coexist. Examples include:
- Resource Partitioning: Different bird species feeding at different heights of the same tree.
- Temporal Partitioning: Animals hunting at different times of the day.
- Character Displacement: Variation in beak size of finches in the Galápagos Islands.
15. (a) Write the first trophic level of Grazing food chain and Detritus food chain.
Answer:
- Grazing Food Chain: Producers (Plants or Phytoplankton)
- Detritus Food Chain: Detritivores (Fungi, Bacteria)
(b) In aquatic ecosystems, which food chain is the major conduit for energy flow?
Answer:
Grazing Food Chain
More answers are being updated here, keep refreshing the page to see all questions and answers of Kerala Plus Two Biology Exam 2025.
Also Check:
Kerala Plus Two Physics Exam 2025 Check Paper Analysis, Question Paper and Answer Key
AP Inter Time Table 2025: Andhra Pradesh Board 1st, 2nd Year Date Sheet PDF Download
Comments
All Comments (0)
Join the conversation