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Kerala Plus Two Biology Answer Key 2026 (OUT): Paper Solving Ends, Question Paper Review

PART - B ZOOLOGY 

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

2. Note the relationship between the first two words and find a suitable word for the fourth place:

LNG - 20: Hormone Releasin IUD

Multiload 375: ---

A - Affected Male 

B - Marriage

Colostrum

Human Genome Project

6. Answer the following questons:

(a) All copulations do not lead to fertilization and pregnancy. Why?

(b)After ovulation, the remaining part of the Grafian follicle transforms into a structure called

(a) Because ovum and sperm are required to reach simultaneously to the ampullary-isthmic junction of the fallopian tube, which only occurs during the fertile window.

(b) Corpus luteum

7. What is amniocentesis ? Why is it banned in India

Pre-Natal diagnostic test. Banned to prevent female foeticide

8. The amino acid sequences of the ß (beta) globin chain of haemoglobin of two individuals are shown below

(i) Val - His - Leu - Thr - Pro - Glu - Glu

(ii) Val - His - Leu - Thr - Pro - Val - Glu

(a) Which one belongs to the haemoglobin of a sickle cell anaemic patient ?

(b) Give reason for your answer.

(a) (ii) Val - His - Leu - Thr - Pro - Val - Glu

(b) Point mutation

9. T.H. Morgan selected Drosophila melanogaster as his experimental material. Mention two reasons for selecting Drosophila as an experimental

• Simple Cultivation: They can be grown easily on simple synthetic medium in a laboratory setting using small glass bottles
• Short Life Cycle: They complete their entire life cycle (from egg to adult) in about two weeks
  

10. (a) Complete the chart showing the hormonal control of spermatogenesis

(a)

• A - Anterior Pituitary
• B - FSH
• C - Leydig Cells 

(b) Which part of the sperm contains enzymes that help in the fertilization of Ovum?

(b) Acrosome

11. Make pairs by matching the related items based on their relationship:

• Cyslosporin A,
• asonarcus purpareus
• Statins
• Trichoderma podysporse

Cyslosporin A, → Trichoderma podysporse

asonarcus purpareus → Statins

12. Match the following

• Alec Jeffreys - DNA Fingerprinting
• james watson and francis crick - Double Helix Model of DNA
• Erwin Chargaff - Ratio between Adenine (A) equals Thymine (T), and Cytosine (C) equals Guanine (G) 
• Frederick griffith - Transforming principle

13. Complete the chart showing the different barriers of innate immunity

A - Skin

B - Physiological Barrier

C - Cellular Brriers

D - Cytokine barriers

14. Diagrammatic representation of an experiment is given below:

(a) who conducted this experiment 

(a) Urey-Miller

15. The pictures shown below are the beaks of certain birds found in an island during Darwin's journey.

(a) Identify the birds and the island

(b) Which evolutionary phenomenon is represented in the picture?

(a) Darwin's Finches , Galapagos

(b) Adaptive Radiation

16 (a) Identify the diagram given below:

(b) Label the parts X and Y

(a) Antibody

(b) X - Light chain , Y - Heavy Chain

17. (a) Complete the table by filling A,B, and C

• A - 45A + XY / XX: Down Syndrome (Trisomy 21)

• B - 44A + XO: Turner Syndrome

• C - 44A + XXY: Klinefelter Syndrome

(b) Write one symptom of each genetic disorder

• Down Syndrome (45A + XX/XY): Short stature with a small, round head and a characteristic furrowed tongue.
• Turner Syndrome (44A + X0): Sterility in females due to rudimentary (underdeveloped) ovaries.
• Klinefelter Syndrome (44A + XXY): Gynaecomastia, which is the development of breast tissue in affected males.
  

18. Incidents of STIs are very high among the age group of 15-24 years. 

(a) What is meant by STI

(b) Name any two STis.

(c.) Suggest any two preventive measures.

(a) STI (Sexually Transmitted Infection)

(b) Syphilis, Gonorrhea

(c.) Avoid sexual intercourse with unknown or multiple partners.

Always use condoms during coitus.

19. Observe the following chart of the evil bioquartet of biodiversity loss: 

(a) Write A and B

(b) What are the two methods of biodiversity conservation?

(c) Give one example each

(a) A- Habitat loss and Fragmentation,  B - Co-extinction

(b) 

• In-situ Conservation
• Ex-suit Conservation

(c) 

• In-situ Conservation - National Parks and Wildlife Sanctuaries
• Ex-suit Conservation - Zoological Parks (Zoos) and Botanical Gardens

20. Genetic code is the sequence of nitrogen bases (nucleotides) in an mRNA molecule that contains information for the synthesis of proteins.

(a) Which is the start codon? Which amino acid does it represent?

(b) Write any two stop codons.

(c) Genetic code is degenerated. Why ?

(a) AUG is the start codon. It represents the amino acid Methionine (Met).

(b) UAA, UAG, and UGA (any two).

(c) The genetic code is degenerate because some amino acids are coded by more than one codon. (For example, there are 61 codons for only 20 amino acids).

PART A - BOTANY

1. A genetic mechanism which prevents inbreeding depression in majority angiogenic plants—-

(D) Slef-Incompatibility

2. Given below are the steps carried out to construct a recombinant DNA. Which of the following is the correct sequence

(B)

3. Name the Indian Crop variety for which in 1997, an American company got patent right through the US Patent and Trademark Office

Basmathi Rice

4. The state of human population...

(A) Declining population

5. If 10,000 joules of energy is available...

10 J

9. Match the following

1 - D

2 - A

3 - B 

4 - C

10. (A) state the changes...

(B) How are the two polypetide..

(A) A + B  (join), C - Remove

(B) Disulphide Bonds

12.State the various defence mechanism... 

• Frogs - Camouflage
• Monarch Butterfly - Distastefull

13. Study the graph and answer the questions. 

(a) Logistic growth

(b) Carrying capacity

14. Identify the following interaction

(a) Commensalism

(b) Mutualism

(c) Competition

(d) Parasitism

17. Answer the question by looking at the figure

(a) Dicotyledon embryo

(b) B - Suspensor, C - Radicle, D - Plumule, E- Cotyledon

(c) Provide essential energy to seedling.