Class 11 Sample Paper 2026 Biology

2026
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Practice Paper
(2025-26)
Class – XI
Biology (Code: 044)

Time: 3 hours Maximum Marks: 70

General Instructions :
Read the following instructions very carefully and strictly follow them: -

• All questions are compulsory.
• The question paper has five sections and 33 questions.
• Section–A has 16 questions of 1 mark each.

• Section–B has 5 questions of 2 marks each.
• Section–C has 7 questions of 3 marks each.
• Section–D has 2 case-based questions of 4 marks each and
• Section–E has 3 questions of 5 marks each.

There is no overall choice. However, internal choices have been provided in some questions. A student has to
attempt only one of the alternatives in such questions.
Wherever necessary, neat and properly labelled diagrams should be drawn.

Section – A
Q. No. 1 to 16 are multiple choice questions. Each question carries 1 mark. Only one of the choices is
correct. Select and write the correct choice.
Q. Question Marks
No
First word Mangifera, Solanum and Panthera are ____________
1 1
a) Genera b) Species c) Specific epithets d) Family
Nostoc and Anabaena fix atmospheric nitrogen in specialized cells called
2 1
a) Gelatinous sheath b) Heterocysts c) Pellicle d) Pectin

3 The giant Redwood tree (Sequoia) 1
a) Angiosperm b) Free fern c) Pteridophyte d) Gymnosperm

From the following phylum which organisms do exhibit radial symmetry in adults and bilateral
4 symmetry in larvae? 1
a) Echinodermata b) Arthropoda c) Annelida d) Chordata

5
1

Identify the above types of placenta
A) (a) Basal (b) Free central (c) Parietal (d) Axile (e) Marginal
B) (a) Free central (b) Basal (c) Axile (d) Parietal (e) Marginal
C) (a) Marginal (b) Parietal (c) Free central (d) Axile (e) Basal
D) (a) Marginal (b) Axile (c) Parietal (d) Free central (e) Basal

Q. Question Marks
No

6 Mesophyll is made up of 1
a) Collenchyma b) Parenchyma c) Sclerenchyma d) Phloem

7 Mesosomes are the foldings of cell membrane, which 1
I) Are in the form of vesicles tubules and lamellae.
J) Increase the surface area of plasma membrane.
K) Are present in both prokaryotic and eukaryotic cells.
Which of the following option is most appropriate?

a) (J) and (K) b) ( I) and (J) c) (I) and( K) d) ( I), (J) and (K)

8 Match the Column I with Column II and choose the right option given below:
1
Column I Column II

A) Lysosomes 1) Moves materials out of the cells.

B) Golgi complex 2) Protein synthesis and secretion.

C) SER 3) Lipid synthesis.

D) RER 4) Intracellular and extracellular digestion.

a) A-(3), B-(2), C-(1), D-(4)
b) A-(4), B-(3), C-(2), D-(1)
c) A-(4), B-(1), C-(3), D-(2)
d) A-(2), B-(4), C-(1), D-(3)

9 Identify the correct graph displaying the effect of pH on the velocity of a typical enzymatic
reaction(V)? 1

10 The first acceptors of electrons from an excited chlorophyll molecule of photosystem-II is
a) Iron-sulphur protein b) Quinone c) Cytochrome d) Ferredoxin 1

Hypothalamus controls
11
i) Urge for eating and drinking
ii) Body temperature 1
iii) Secretes hormones
iv) Creative thinking and consciousness
Choose the correct option:
a) (I ),(ii), and (iii) b) (i) and (ii) c) (i) and (iii) d) (ii) and (iii)

12 Gastric Inhibitory Peptide (GIP) 1
a) Inhibits the gastric secretion
b) Activate the gastric secretion and motility
c) Activate the gastric secretion
d) Inhibits the gastric secretion and motility

For Question numbers 13 to 16, two statements are given- one labelled as Assertion (A) and the
other labelled as Reason (R). Answer these questions by selecting the appropriate option given
below:

a) Both (A) and (R) are true and (R) is the correct explanation of (A).
b) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
c) (A) is true, but (R) is False.
d) (B) is false, but (R) is true.

13 Assertion (A): Species is a group of individuals with fundamental similarities. 1
Reason (R): Indica,leo, tuberosum represent such group of individuals.

14 Assertion(A): Small disc-shaped structures at the surface of the centromeres are called 1
kinetochores.

Reason (R): Kinetochores are proteinaceous structures.

15 Assertion (A): The end of T-wave marks the end of ventricular systole. 1

Reason (R) : T- wave represents the return of ventricles from excited to normal state which is
repolarization.

16 Assertion (A): Dialytic fluid / solution is iso-osmotic to blood plasma. 1
Reason (R): The fluid used during dialysis procedure contain glucose and ions.

Section – B
Q. Question Marks
No

17 2
a) Raji is having blood group A-ve while her husband’s blood group is O+ve, their first
child is A+ve, but her second child was born with severe anaemia and jaundice.
What could be the condition?
b) Write two main categories of WBC’s

OR

What are phagocytic cells and write its function.

18 Complete the following sentences:
a) The process of excreting ammonia is _____________. 2
b) The cortex extends in between the medullary pyramids as renal columns called ________.
c) The renal tubule begins with a double walled cup-like structure called_________.
d) Accumulation of urea in blood, a condition called__________.

19 Explain the following terms: 2
a) Myasthenia gravis
b) Muscular dystrophy

OR

a) Tetany
b) Osteoporosis

20 Draw a diagram showing axon terminal and synapse. 2

21 Name the hormone secreted by pineal gland and also mention its important role. 2

OR

Explain what is Addison’s disease.

Section – C
Q. Question Marks
No

22 In pteridophytes, the main plant body is a sporophyte which is differentiated into true root,stem 3
and leaves. These organs possess well differentiated vascular tissues.
i) What are sporophylls?
ii) Name any two species of pteridophytes which show heterospory.
iii) Name the male and female sex organ of pteridophytes.

OR

a) How are pteridophytes similar to bryophytes?
b) Which pteridophytes are useful in nitrogen fixation and how?

23 Differences between Chondrichthyes and Osteichthyes (Any three points) 3

24 a) ‘X’ is the female reproductive part of the flower, which consists of three parts P, Q and R. 3
‘P’ is the swollen bottom part, ‘Q’ is the filament like structure and ‘R’ is the sticky part.
Name all X, P, Q and R.
b) How superior and inferior ovaries are indicated by symbol?

25 The lysosomal enzyme does not destroy the cell’s own cytoplasm. Explain why? 3

26 Fatty acids are the organic acids having hydro-carbon chains that ends in a carboxylic group 3
(--COOH). The fatty acids can be saturated or unsaturated in nature.

i) Name the category fats belongs.
ii) What is chloresterol?
iii)Draw diagrammatic representation of cholesterol.

Q. Question Marks
No
Fill in the blanks at ‘A , B , C, D, E and F’ and complete the C4 pathway.
27 3
Atmospheric CO2 enters ‘A’

CO2 is accepted by ‘B’ and forms four carbon
acid compound ‘C’
``

C4 acids enters into ‘D’ and splits into CO2 and
‘E’

CO2 enters Calvin cycle and 3C acid ‘F’ is
formed.

28 How are gibberellins useful in agriculture to improve productivity? Give any three points in support 3
of your answer.

Section – D
Questions Nos 29 and 30 are case-based questions. Each question has sub questions with internal choice in one
sub-question.

Q. Question Marks
No

29 Observe the diagram shown below and answer the following questions.
4

1) Find out the labels A,B and C in the shown figure:
a) A-DNA , B-Cell membrane , C-Cell wall
b) A-Cell wall ,B-Cell membrane , C-DNA
c) A-DNA, B-Cell wall, C-Cell membrane
d) A-Cell membrane, B-DNA, C-Cell wall
2) How does bacteria reproduce?
OR
Name the organisms that completely lack a cell wall.
3) Cell wall of bacteria is composed of
a) Complex lipids
b) Lipids
c) Mucopeptide complex
d) Lipoprotein

4) Which bacteria play a great role in recycling nutrients like nitrogen, phosphorous,
iron and sulphur?

30 Read the following passage and answer the questions that follows: 4
.
Ritesh worked in a certain industry involving grinding or stone-breaking, so much dust is produced
that the defense mechanism of the body cannot fully cope with the situation. The other workers
were also often unwell, mostly suffering from respiratory disorder. The matter were discussed
within the higher authorities. The preventive measures were suggested regarding health of the
workers. The measures proved to be helpful.
1) What do you understand by Emphysema? What is the major reason of its cause?
2) Name the disease caused by Occupational Respiratory Disorders as many workers were
suffered in the above passage.
3) What are preventive measures suggested by the higher authorities?

Section – E
Q. Question Marks
No

31 a) Draw diagrammatic representation of internal organs of frog showing complete digestive
system. ( Label any six parts) 5
b) Where is bile stored in the body of frog?
OR
a) What is difference between cutaneous and pulmonary respiration?
b) Frogs are beneficial for mankind. Justify the statement.
c) Where is the Bidder’s canal located and how is it useful in frog?

a) Draw a neat and labelled diagram of the following:
32 i) Metaphase -I
ii) Prophase -II 5
iii) Telophase-II
b) Distinguish between anaphase of mitosis and anaphase-I of meiosis.

OR
Describe the following in brief:
i) Leptotene
ii) Zygotene
iii) Diakinesis
iv) Chiasmata
v) Synapsis

33 Describe the steps of glycolysis with the names of enzymes and intermediates. 5
OR

Explain the major steps of Kreb’s cycle. Where does this process occur in a cell?