Kerala Plus Two Biology Question Paper 2026 with Answer Key: Download PDF

The Kerala Higher Secondary Biology exam was held today, March 24, 2026. Biology is often considered a challenging subject as it includes both intricate theoretical and practical, diagram-based concepts and topics. As the exam is over now, students must be searching for today's question paper and answers to match their responses and estimate teir scores. In this article, we have provided the Kerala Plus Two Biology question paper 2026 along with the answer key prepared by subject experts. This answer key includes answers to all MCQs and key points for the descriptive questions. Download these important resources to evaluate your performance and plan your next academic steps.

Kerala Plus Two Biology Exam 2026: Key Highlights

To give you a quick overview of today's examination, here are the essential details organized for easy reference:

Kerala Plus Two Biology Question Paper Pattern 2026

Based on the 2026 question paper, the exam follows a specific structure designed to test both memory and analytical skills. The questions was divided into two parts - Botany and Zoology. Each part carried equal weightage of 30 marks and included questions of different formats as mentioned below:

Note: The pattern is identical for both Botany and Zoology.

Download Kerala Plus Two Biology Question Paper 2026 PDF

You can download the complete Kerala Plus Two Biology Question Paper 2026 in PDF format using the link below to review the questions and assess the difficulty level.

Kerala Plus Two Biology Answer Key 2026

Below is the detailed answer key for the Biology exam held on March 24. This section covers the correct options for objective questions and key points for the descriptive sections to help you calculate your approximate score.

Part A - Botany Answer Key

I - 1 Mark Questions

1. Question: A genetic mechanism which prevents inbreeding depression in majority of angiospermic plants is...

   •  Answer: (d) Self-Incompatibility

2. Question: Correct sequence of steps to construct recombinant DNA.

   •  Answer: (b) (i) Isolation, (iv) Amplification, (ii) Insertion, (iii) Obtaining product, (v) Downstream processing 

3. Question: Name the Indian crop variety for which an American company got patent rights in 1997.

   •  Answer: Basmati Rice 

4. Question: Status of human population reflected in the provided age pyramid.

   •  Answer: (a) Declining population (The base is narrower than the middle) 

5. Question: If 10,000 Joules is at producer level, how much is available to the tertiary consumer?

   •  Answer: 10 Joules (Based on the 10% law: $10,000 \rightarrow 1,000 \rightarrow 100 \rightarrow 10$)

II - 2 Mark Answer Hints

•  Q6 (Bagging vs Emasculation): Bagging is essential to prevent contamination of the stigma with unwanted pollen, even if the flower is unisexual (no emasculation needed).

• Q7 (Pollen Wall): Exine is made of Sporopollenin (highly resistant organic material); Intine is made of Cellulose and Pectin.

• Q8 (Bacterial Competence): DNA is hydrophilic and cannot pass through the lipid-rich cell membrane. Bacteria are made competent using divalent cations (like Ca²⁺) and heat shock.

• Q11 (Bt Protein): The toxin exists as inactive protoxin in the bacteria. It becomes active only in the alkaline pH of the insect's gut.

• Q12 (Predator Defence): (a) Frogs: Camouflage/Cryptic coloration. (b) Monarch Butterfly: Distasteful chemical acquired during caterpillar stage.

• Q14 (Interactions): (a) Commensalism, (b) Mutualism, (c) Competition, (d) Parasitism.

Answer Key: Part B - Zoology

I - 1 Mark Questions

1. Question: Find the odd one out: Bone marrow, Spleen, Lymph nodes, Tonsils.

   •  Answer: Bone marrow (It is a primary lymphoid organ, others are secondary). 

2. Question: Multiload 375: ______

   •  Answer: Copper releasing IUD.

3. Question: Pedigree symbol identity (Solid square and circle).

   •  Answer: Affected male (Square) and Affected female (Circle). 

4. Question: Milk produced during initial days of lactation.

   •  Answer: Colostrum.

5. Question: Expand HGP.

   •  Answer: Human Genome Project. 

Section II (2 Mark Answer Hints)

• Q6: (a) Fertilization only occurs if the ovum and sperm are transported simultaneously to the ampullary region. (b) Corpus luteum.

• Q7: Amniocentesis is a fetal sex determination and disorder test based on chromosomal patterns in amniotic fluid; it is banned to prevent female foeticide.

•  Q8: (a) Sequence (ii) belongs to the patient. (b) Because Valine (Val) has replaced Glutamic acid at the 6th position of the beta-globin chain.

•  Q9: Drosophila has a short life cycle (~2 weeks), can be grown on simple synthetic medium, and shows clear hereditary variations.

•  Q14: (a) Stanley Miller and Harold Urey. (b) To provide experimental evidence for the chemical evolution of life.

Kerala Plus Two Biology Exam Analysis 2026 

The 2026 Biology paper was balanced and moderate in terms of difficulty. Part A (Botany) focused heavily on Biotechnology and Ecology, featuring several direct diagrams. Part B (Zoology) leaned towards Genetics and Human Reproduction. While the 1-mark questions were straightforward, some of the 2-mark application questions required a clear understanding of concepts explained in the prescribed textbook. Students who practiced previous years' diagrams would have found the identification questions quite easy.

Overall, the Kerala Plus Two Biology exam 2026 was student-friendly, offering ample choices in every section. By reviewing the answer key above, you can get a realistic idea of your score before the official results are announced. Focus now on your remaining exams and stay positive!