PSEB CLASS 11 BIOLOGY GUESS PAPER MARCH 2026 SET 2

PUNJAB SCHOOL EDUCATION BOARD

PSEB CLASS 11 BIOLOGY GUESS PAPER MARCH 2026 (SET 2)

Max Marks: 70 Time allowed: 3 Hours

General Instructions:

1. Question paper will consist of four sections A, B, C and D with a total of 19 questions.
2. Section-A will contain question number 1 having 20 parts of 1 mark each. 12 questions will be of Multiple-choice question type, 4 fill in the blanks, and 4 are True/False.
3. Section-B will contain questions number 2 to 11 (total 10 short answer type questions) of 2 marks each. Questions 4, 5, 9, 11 will have internal choice.
4. Section-C will contain questions number 12 to 16 (total 5 questions) of 3 marks each. Questions 12 and 15 will have internal choice.
5. Section-D will consist of questions 17 to 19 (total 3 questions) of 5 marks each. One choice question in each of question numbers 17 and 18 will necessarily be of a diagram/illustrative/graph-based question. One choice question in question number 19 will be a comprehension type question. All questions will have 100% internal choice.

SECTION - A (1 Mark Each)

1. Answer the following questions:

Multiple Choice Questions:

(i) The term "taxon" refers to:
(a) Name of a species    (b) Name of genus    (c) Name of family    (d) A taxonomic group of any rank

(ii) Mucor is a kind of:
(a) Algae    (b) Fungus    (c) Protista    (d) Bacteria

(iii) Which pigment is responsible for the green color in algae?
(a) Phycobilins    (b) Chlorophyll    (c) Xanthophyll    (d) Carotenoids

(iv) What type of symmetry do porifera have?
(a) Asymmetrical    (b) Bilateral    (c) Radial    (d) Exoskeleton

(v) Flower is modified shoot meant for:
(a) Vegetative Reproduction    (b) Asexual Reproduction    (c) Beautification    (d) Sexual Reproduction

(vi) Cork is the product of:
(a) Xylem    (b) Dermatogens    (c) Phellogen    (d) Vascular cambium

(vii) In frog heart, there are cardiac muscles which consist of fibers called:
(a) Purkinje fibers    (b) Myonemes    (c) Telodenria    (d) Columned carnal

(viii) Which of the following is a double membrane bound organelle?
(a) Chloroplast    (b) Mitochondria    (c) Nucleus    (d) All of these

(ix) Inulin is a polymer of:
(a) Fructose    (b) Glucose    (c) Galactose    (d) Sucrose

(x) The longest stage in the cell cycle is:
(a) Interphase    (b) Anaphase    (c) Metaphase    (d) None of the above

(xi) The first acceptor of CO2 in C4 pathway is:
(a) Phosphoenol pyruvate    (b) Ribulose bisphosphate    (c) Oxaloacetic acid    (d) Phosphoglyceric acid

(xii) Flight and fight hormone is:
(a) Thyroxine    (b) Oxytocin    (c) ADH    (d) Adrenaline

Fill in the blanks:

(xiii) ________ is the most abundant chemical in living organisms.
(xiv) The ________ is the functional unit of the kidney.
(xv) ________ is the largest endocrine gland.
(xvi) ________ is an organelle called the powerhouse of the cell.

True / False:

(xvii) Leeuwenhoek was the first to observe the bacteria.
(xviii) Three molecules of ATP are synthesized during glycolysis.
(xix) Plant cells lack a cell wall.
(xx) Rana tigrina is the scientific name of cockroach.

SECTION - B (2 Marks Each)

2. What is the need for Classification?

3. Write the important characteristic features of phylum Porifera.

4. Differentiate between heart wood and sap wood.

OR

What are closed vascular bundles? Give one example.

5. Differentiate between actin and myosin filaments.

OR

What are the characteristics of a prokaryotic cell?

6. Define the term "growth rate".

7. Why do we call our heart myogenic?

8. Name the blood group which is a universal donor and universal recipient.

9. What is the RQ value for proteins and fats?

OR

Differentiate between diffusion and osmosis.

10. Why is meiosis called reductional division?

11. Write one function each of cytokinins and ethylene.

OR

Distinguish between diabetes mellitus and diabetes insipidus.

SECTION - C (3 Marks Each)

12. Differentiate between Racemose inflorescence and Cymose inflorescence.

OR

Describe the structure and importance of Pteridophytes.

13. Explain the role of Na+ in the generation of an action potential.

14. Explain the different types of placentation in flowering plants.

15. Explain the double circulation in the human heart.

OR

Show diagrammatically non-cyclic and cyclic photophosphorylation.

16. Write a short note on the economic importance of algae.

SECTION - D (5 Marks Each)

17. Draw a well-labelled diagram of the T.S. of a monocot stem and explain its structure.

[Please paste the illustrative diagram of the T.S. of monocot stem here]

OR

Draw a neat and well-labelled diagram of the male reproductive system of a frog and explain its parts.

[Please paste the illustrative diagram of the frog's male reproductive system here]

18. Describe the Cell Cycle with the help of suitable diagrams.

[Please paste the diagram of the Cell Cycle here]

OR

Explain the fluid mosaic model of the plasma membrane. What are its key components and functions?

[Please paste the diagram of the Fluid Mosaic Model here]

19. Comprehension Question:
Mary’s mother often complained of severe headaches, severe anxiety, shortness of breath, and nosebleeding. She was taken to a nearby hospital, where the doctor checked her blood pressure. The doctor confirmed it as a case of hypertension and prescribed medicines to be taken daily. The doctor also imposed certain restrictions on her diet.

Read the above passage and answer the following questions:
(i) What is considered normal blood pressure in a healthy human?
(ii) What is hypertension?
(iii) What are the common causes of high blood pressure?
(iv) Name the instrument used to measure blood pressure.

OR

Comprehension Question:
A closer examination reveals that the relative abundance of carbon, hydrogen, and oxygen is higher in living systems when compared to inanimate matter. The most abundant chemical in living organisms is water. There are thousands of small molecular weight biomolecules. Proteins are heteropolymers made of amino acids, while nucleic acids serve as the genetic material. Enzymes are proteins which catalyze biochemical reactions in the cells.

Read the above passage and answer the following questions:
(i) What is the most abundant chemical in living organisms?
(ii) What are the building blocks (monomers) of proteins?
(iii) What is the primary function of enzymes in a living cell?
(iv) Name the biomolecule that serves as the genetic material in living systems.

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