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Kerala Plus Two Biology Answer Key 2026:

The Directorate of Higher Secondary Education (DHSE) Kerala conducted the Plus Two Biology exam on March 24, 2026. The exam was held from 9:30 AM to 11:45 AM (2 hours 15 minutes). Thousands of students appeared for the exam across various centres in Kerala.

The Kerala Plus Two Biology Unofficial Answer Key 2026 is prepared by subject experts immediately after the exam. Students can use this answer key to verify their responses and estimate their scores out of 60 marks in the theory paper.

Kerala Plus Two Biology 2026 – Exam Highlights

Kerala Plus Two Biology Unofficial Answer Key 2026

DHSE Kerala does not release the official answer key immediately after the exam. However, expert teachers and coaching institutes publish an unofficial answer key based on the question paper. This answer key includes detailed solutions for both Botany and Zoology sections.

Students should use this unofficial answer key only for reference purposes to estimate their scores before the official results are declared.

Kerala Plus Two Biology Unofficial Question and Answer 2026

Part A- Botany

Question:

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

Answer: (D) Self-Incompatibility

Question: Given below are the steps carried out to construct recombinant DNA. Which of the following is the correct sequence?

Answer: (B)

Question:  Name the Indian crop variety for which an American company got patent rights in 1997 through the US Patent and Trademark Office:

Answer: Basmati Rice

Question: The state of human population is:

Answer: (A) Declining population

Question: If 10,000 joules of energy is available at a trophic level, how much energy will be available at the next level?

Answer: 10 J

Question: Match the following:

Answers:

1 – D
2 – A
3 – B
4 – C

Question:  (A) State the changes required to produce insulin using recombinant DNA technology.

Answer:  A + B (join), C – Remove

                (B) How are the two polypeptide chains of insulin held together?

Answer: Disulphide Bonds

Question: State the various defence mechanisms in the following organisms:

Answer:

Frog – Camouflage
Monarch Butterfly – Distasteful

Question: Study the graph and answer the questions:

Answer:

(a) Logistic growth
(b) Carrying capacity

Question: Identify the following interactions:

Answer:

(a) Commensalism
(b) Mutualism
(c) Competition
(d) Parasitism

Question: Answer the following by looking at the figure:

Answer:

(a) Dicotyledon embryo
(b) B – Suspensor, C – Radicle, D – Plumule, E – Cotyledon
(c) Provides essential energy to the seedling

Part B – Zoology

Question: Expand HGP.

Answer: Human Genome Project

Question: What is amniocentesis? Why is it banned in India?

Answer: Amniocentesis is a prenatal diagnostic test. It is banned in India to prevent female foeticide.

Question: Find the odd one out and state the reason: Bone Marrow, Spleen, Lymph Nodes, Tonsils.

Answer: Bone Marrow – It is a primary lymphoid organ, whereas others are secondary lymphoid organs.

Question: The milk produced during the first few days of lactation is called ______.

Answer: Colostrum

Question: The amino acid sequences of the β-globin chain are given:

(i) Val – His – Leu – Thr – Pro – Glu – Glu
(ii) Val – His – Leu – Thr – Pro – Val – Glu

(a) Which one is of a sickle cell anaemic patient?
(b) Give reason.

Answer:

(a) (ii) Val – His – Leu – Thr – Pro – Val – Glu
(b) Due to point mutation

Question: Who conducted the experiment shown in the diagram?

Answer: Urey and Miller

Question: Identify the symbols used in pedigree analysis:

A – ?
B – ?

Answer:

A – Affected Male
B – Marriage

Question: Note the relationship and complete:

LNG – 20 : Hormone releasing IUD
Multiload 375 : ______

Answer: Copper releasing IUD

Question: T.H. Morgan selected Drosophila melanogaster. Give two reasons.

Answer:

Easy to cultivate
Short life cycle

Question: Complete the chart showing hormonal control of spermatogenesis:

A – ?
B – ?
C – ?

Answer:

A – Anterior Pituitary
B – FSH
C – Leydig Cells

Question: Which part of sperm contains enzymes for fertilization of ovum?

Answer: Acrosome

Question: Answer the following:

(a) Why do all copulations not lead to fertilization?
(b) After ovulation, the Graafian follicle transforms into ______

Answer:

(a) Fertilization occurs only when sperm and ovum meet at the right time during the fertile window
(b) Corpus luteum

Question:  Make correct pairs:

Cyclosporin A
Monascus purpureus
Statins
Trichoderma polysporum

Answer:

Cyclosporin A → Trichoderma polysporum
Monascus purpureus → Statins

Question: Match the following:

Alec Jeffreys
James Watson & Francis Crick
Erwin Chargaff
Frederick Griffith

Answer:

Alec Jeffreys → DNA Fingerprinting
Watson & Crick → Double Helix Model
Chargaff → A = T and C = G
Griffith → Transforming principle

Question: Complete the chart of innate immunity barriers:

A – ?
B – ?
C – ?
D – ?

Answer:
A – Skin
B – Physiological barrier
C – Cellular barrier
D – Chemical barrier

Question: Darwin observed bird beaks during his journey:

(a) Identify the birds and island
(b) Name the evolutionary phenomenon

Answer:

(a) Darwin’s Finches, Galapagos Islands
(b) Adaptive Radiation

Question: Identify the diagram and label parts:

(a) Diagram name
(b) X and Y

Answer:

(a) Antibody
(b) X – Light chain, Y – Heavy chain

Kerala Plus Two Biology Exam Analysis 2026

The Kerala Plus Two Biology Question Paper 2026 was divided into multiple sections covering Botany and Zoology topics. Based on initial student reactions and expert reviews, the difficulty level is provided below.

Note: Detailed section-wise analysis will be updated after the exam concludes.

How to Calculate Your Score Using Kerala Plus Two Biology Answer Key 2026

The Kerala Plus Two Biology theory paper carries 60 marks. Students can calculate their estimated score by comparing their answers with the unofficial answer key.

Note: The total exam is 80 marks, including 20 marks for internal assessment. Students must secure at least 30% marks in theory to pass.

How to Download Kerala Plus Two Biology Answer Key 2026

Follow these simple steps to download the Kerala Plus Two Biology Unofficial Answer Key 2026:

1. Visit the official DHSE Kerala website or a trusted education portal.
2. Search for Kerala Plus Two Answer Key 2026.
3. Select the Biology subject.
4. Click on the answer key PDF link.
5. Download and compare your answers to calculate your score.