Class 11 Question Paper 2025 Biology

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Annual Exam 2025 Question Paper

SESSION ENDING EXAMINATION 2024-25
CLASS: XI ​ ​ ​ ​ ​ ​ ​ ​ SUBJECT: BIOLOGY
TIME: 3 HOURS​ ​ ​ ​ ​ ​ ​ M. MARKS: 70

General Instructions:
●​ This question paper contains 33 questions.
●​ All questions are compulsory. However, internal choices have been provided in some
questions. Attempt only one of the choices in such questions.
●​ The paper is divided into 5 Sections - A, B, C, D and E.
●​ Section A consists of 16 questions (1 to 16). Each question carries 1 mark.
●​ Section B consists of 5 questions (17 to 21). Each question carries 2 marks.
●​ Section C consists of 7 questions (22 to 28). Each question carries 3 marks.
●​ Section D consists of 2 case-based-questions (29 to 30). Each question carries 4 marks.
●​ Section E consists of 3 questions (31 to 33). Each question carries 5 marks.
●​ Wherever necessary, neat and properly labelled diagram should be shown.

Q No Section-A (16x1 = 20 marks) Marks

1 The effect of apical dominance can be overcome by which of the 1
following hormone?
A.​ IAA B. Ethylene C. Gibberellin D. Cytokinin

2 Pyruvic acid, the key product of glycolysis can have many metabolic fates. 1
Under aerobic condition it forms
A.​ Lactic acid B. CO2 + H2O
C. Acetyl CoA + CO2 D. Ethanol + CO2

3 Identify the asexual reproductive structure associated with Penicillium 1
A.​ Conidia B. Gemmules C. Buds D. zoospores

4 Which one of the following plants shows vexillary aestivation and 1
diadelphous stamens?
A.​ China Rose B. Pea C. Citrus D. All of above

5 Ground tissue includes: 1
A.​ all tissues except epidermis and vascular bundles
B.​ epidermis and cortex
C.​ all tissues internal to endodermis
D.​ all tissues external to endodermis

6 The RNA contains a base uracil in place of 1
A.​ Adenine B. guanine C. cytosine D. thymine

7 Which of the following is true about axoneme except 1
A.​ It has nine doublets of peripheral microtubules
B.​ A proteinaceous hub
C.​ Nine radial spokes

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D.​ Central sheath present

8 Systematics refers to the study of: - 1
A.​ Nomenclature and identification of plants and animals
B.​ Different kinds of organisms and their classification
C.​ Diversity of kinds of organisms and their relationships
D.​ Identification and classification of plants and animals

9 Which one of the following statements is incorrect? 1
A.​ Heart muscles are striated and involuntary
B.​ The muscles of hands and legs are striated and voluntary
C.​ The muscles located in the inner walls of alimentary canal are striated
and involuntary
D.​ Muscles located in the reproductive tracts are unstriated and
involuntary

10 Identify A, B, C, D in the following diagram 1

A.​ A-Troponin, B- actin, C- Myosin head, D-cross arm.
B.​ A-Actin binding sites, B-ATP binding sites, C-Head, D-Cross-arm.
C.​ A-Cross-arm, B- Actin binding sites, C- ATP binding sites, D- Head
D.​ A- Head, B- Cross-arm, C- Actin binding sites , D-ATP binding sites

11 The function of ATP in photosynthesis is the transfer of energy from the 1
A.​ Dark reaction to the light reaction
B.​ Mitochondria to chloroplasts
C.​ Chloroplasts to mitochondria
D.​ Light reaction to the dark reaction

12 Reabsorption of water from distal parts of the tubules is facilitated by 1
hormone
A.​ Vasopressin B. Atrial Natriuretic Factor
C. Angiotensin II D. Aldosterone

Question No. 13 to 16 consist of two statements – Assertion (A) and
Reason (R). Answer these questions 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 and R is not the correct explanation of A.
C.​ A is true but R is false.
D.​ A is false but R is true.

13 Assertion: The conversion of 1,3-biphosphoglycerate (BPGA) to 3- 1
phosphoglyceric acid (PGA) is an energy yielding step.
Reason: By the formation of ATP, this energy is trapped.

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14 Assertion: G1 phase is the interval between mitosis and initiation of DNA 1
replication.
Reason: The cell is metabolically inactive during G1 phase.

15 Assertion: Medulla oblongata causes reflex actions like vomiting, 1
coughingand sneezing
Reason: It has many nerve cells which control autonomic reflexes.

16 Assertion: There is hepatic portal system in frogs. 1
Reason: It is venous connection between liver and intestine in frog.

Section-B (5x2 = 10 marks)

17 In a given specimen, Himanshi observed them to be photosynthesising and 2
filamentous member specimen, but could not reveal them clearly while
saloni stated this to be Algal group member . Could you help Himanshi
what the organism would look like to be with the help of well labelled
diagram.

18 Mitochondria, chloroplast, and peroxisomes are not part of the 2
endomembrane system. Give Reason.

19 Molecular structure of two aminoacids is given below. 2

(i)​ The presence of which two functional groups enable you to
identify the above molecules as amino acids.
(ii)​ Give the name of two amino acids (a) & (b ) of the structure
given above

20 2

Above figure illustrate the mode of transmission of message from a
neuron . Can you ---
(i)Identify the labelling C and what molecule it releases in figure B .
(ii) Also identify A and its significance .

21 A diagrammatic representation of a nephron showing blood vessels, duct 2
and tubule

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(a)​ Identify A and B.
(b)​Name the type of epithelium that lines the proximal convoluted
tubule (PCT) of a nephron.

Section - C (7x3 = 21 marks)

22 Observe the figure A & B 3
(i) Identify the aestivation in A & B
(ii) Write one peculiarity of A
(iii) Name the three kinds of petals in B

23 Observe the given figure and answer these 3
(i) Identify the plant. Which division of plant kingdom it belongs to ?
(ii)Briefly explain the structures labelled as ‘a’ &’b’?

24 Two levels of protein structure (A) & (B) is given below 3

(i) What is A & B level of protein structure?

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(ii) Which is the most abundant protein in the biosphere ?
(iii) Out of the two structures mentioned above which structure imparts
functionality to proteins.

25 Given below are pictures of two members A and B 3

Member A Member B
a) Could you identify the members given above in the figure as member
A & B and to which class they are placed in classification..
b) What are the (any) two basic criteria on the basis of which above
identified members have been placed in different classes

26 Name the part of Heart Label as A,B,C,D,E,F. 3

27 Rohan and Shivansh once argued on the amount of energy yielded from 3
breakdown of Glucose during Aerobic & Anaerobic respiration.
a)​ As per Rohan amount of energy yielded in Aerobic respiration is low
while vice-versa in case of Shivansh . Could you suggest who is correct
and why?
b)​ Shivansh sketched a table summary to illustrate his result . What could
it be like ? Can you sketch the table that Shivansh could have drawn.

28 Hormones travel via blood and reaches to tissue for action. Can you 3
differentiate how the mechanim of action will be for protein and steroidal
hormones respectively?

Section - D (2x4 = 08 marks) 3

29 Read the following and answer four questions from (i) to (iv) given below: 4

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Maitri came across a root. She made a transverse section to study its
anatomy and identify the type of plant to which it belongs. She drew the
following diagram.

a) What type of arrangement is seen in protoxylem?
b) Identify the type of vascular bundle.
c) Identify with reason whether the root is dicot or monocot.
d) What is the difference between root hair and trichomes found in the
stem?
OR
Stomatal density is defined as the number of stomata per unit leaf area.
Following is a list of stomatal density of a few plants. Study the same and
answer the questions that follow
Plant specimen Stomatal Density
Upper surface Lower surface
1 25-48 27-35
2 10-20 230
3 8-16 132-184
4 52-94 68-128
5 0-90 620
a) Identify the monocot and dicot plants from the list.
b) Show two differences between the stomatal apparatus of dicot and
monocot only through labeled diagrams.

30 Read the following and answer four questions from (i) to (iv) given below: 4
We have two lungs which are covered by a double layered pleura, with
pleural fluid between them. It reduces friction on the lung-surface. The
outer pleural membrane is in close contact with the thoracic lining whereas
the inner pleural membrane is in contact with the lung surface. The part
starting with the external nostrils up to the terminal bronchioles constitute
the conducting part whereas the alveoli and their ducts form the
respiratory or exchange part of the respiratory system. The conducting part
transports the atmospheric air to the alveoli, clears it from foreign
particles,humidifies and also brings the air to body temperature. Exchange
part is the site of actual diffusion of O2 and CO2 between blood and
atmospheric air.
(i) Define the term "residual volume" in the context of breathing
(ii) Explain the biomechanical changes in the ribs and diaphragm during
exhalation.
(iii)Identify the specific term used for the volume of air inspired or expired
during normal respiration.
(iv)Arrange the following in the order of increasing volume
1. Tidal volume 2. Residual volume 3. Expiratory reserve volume 4.

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Inspiratory reserve volume.

Section - E (3x5 = 15 marks)

31 The following diagram shows the characteristic features of a phylum 5

1)​ Name the phylum and label a,b,c and d.
2)​ Mammals are viviparous with few exceptions. Give an example for
oviparous mammals and a flying mammal?
3)​ Birds are well adapted for flying.Give any two of such adaptations?
OR
(a) “All vertebrates are chordates but all chordates are not vertebrates
“justify this statement.
(b) "Explain the unique characteristics and adaptations of cyclostome
organisms that allow them to survive and thrive in their aquatic
environment?"

32 Represent schematically the Calvin cycle & explain the process. 5
OR
Describe Z – scheme of light reaction along with figure. Why it is also
called as non-cyclic photophosphorylation?

33 5

Study the two stages of cell division in the given figure A & Band answer
the questions that follow
(i)Identify the stage and the type of cell division in A & B.
(ii)Write the major difference between the two.
(iii)What is the consequence of the events shown in A & B respectively?
(iv) Which stage of meiosis terminalisation of chiasma occur?
(v)Name the enzyme involved in crossing over?
OR
a)Analyze the events during every stage of cell cycle with a neat labeled
diagram
b) list one difference between Anaphase of mitosis and Anaphse of
Meiosis
c) if a somatic cell of a Gorilla contain 48 chromosomes and it
undergoes one meiotic and two mitotic division simultaneously .

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Determine the number of resultant cells and the chromosome no. it will
have?

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SESSION ENDING EXAMINATION 2024-25
CLASS: XI ​
TIME: 3 HOURS​ SUBJECT: BIOLOGY(044)​​ M. MARKS: 70

General Instructions:
●​ This question paper contains 33 questions.
●​ All questions are compulsory. However, internal choices have been provided in some
questions. Attempt only one of the choices in such questions.
●​ The paper is divided into 5 Sections - A, B, C, D and E.
●​ Section A consists of 16 questions (1 to 16). Each question carries 1 mark.
●​ Section B consists of 5 questions (17 to 21). Each question carries 2 marks.
●​ Section C consists of 7 questions (22 to 28). Each question carries 3 marks.
●​ Section D consists of 2 case-based-questions (29 to 30). Each question carries 4 marks.
●​ Section E consists of 3 questions (31 to 33). Each question carries 5 marks.
●​ Wherever necessary, neat and properly labelled diagram should be shown..

Q No Section-A (16x1 = 16 marks) Marks

1 (D) 1

2 (B) 1

3 (A) 1

4 (B) 1

5 (A) 1

6 (D) 1

7 (B) 1

8 (C) 1

9 (C) 1

10 (B) 1

11 (D) 1

12 (A) 1

13 (B) 1

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14 (C) 1

15 (A) 1

16 (A) 1

Section - B (5x2 = 10 marks)

17 Spirogyra or Ulothrix

18 The function of some cell organelles is coordinated, these are called 2
endomembrane systems like endoplasmic reticulum (ER), Golgi complex,
lysosomes and vacuoles. Since the functions of the
mitochondria, chloroplast and peroxisomes are not coordinated with the
above components; these are not considered as part of the endomembrane
system.

19 (i)Amine group & carboxylic group (1/2
+1/2
(ii)a-Serine b-Alanine +1/2
+
1/2)

20 C-Synaptic Vesicle ½×2
which releases (B)- Neurotransmitter (Acetylcholine)
A- Receptor to detect and bind to specific chemical signals
(neurotransmitters) from other neurons, triggering a cellular response .

21 (a)​ A- Proximal convoluted tubule B- Distal convoluted tubule ½×2
(b)​PCT is lined by simple cuboidal brush border epithelium. 1

Section - C (7x3 = 21 marks)

22 (i) A-Twisted B-Vexillary 1×3
(ii) One margin of the appendage overlaps that of the next one
(iii) Standard petal,Wing petal ,keel petal

23 (i) Marchantia , Bryophytes. ½+½ 3
(ii) a-Archegonium -female reproductive structure which produces female
gamete. -1
b-Gemmae-Asexual reproductive buds. -1

24 (i) A-Secondary structure is local interactions between stretches of a 1+1+1
polypeptide chain and includes α-helix and β-pleated sheet structures.
B-Tertiary structure is the overall the three-dimensional folding

(ii)RUBISCO is the most abundant protein

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(iii) B (Tertiary )structure imparts functionality to proteins

25 Member A Mucor (Phycomycetes) (1+1+1)
Member B Agaricus (Basidiomycetes)

Correct explaination for each

26 3

27 a) Shivansh is correct as aerobic respiration involves complete breakdown 1
of glucose involving oxygen and mitochondriacell organelle

OR

For representing correct table
2

28 Protein hormones react with receptors on the surface of the cell, and the
sequence of events that results in hormone action is relatively rapid. 3
Steroid hormones typically react with receptor sites inside a cell. Because

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this method of action actually involves synthesis of proteins, it is relatively
slow.
Hormones produce their effects on target tissues by binding to specific
proteins called hormone receptors located in the target tissues only
(or for diagrammatic Correct explanation )

Section - D (2x4 = 08 marks)

29 a) Exarch ½
b) Radial ½
c) Dicot, tetrarch xylem 1

d) Root hair. Trichome 2
1. Unicellular. 1. Multicellular
2. Extension of epiblema. 2. Present on epidermis of stem

OR

a) Monocot – 2,3,5
Dicot – 1,4
b) 1

1

1

1

30 (i) RV refers to the volume of air that still remains within the lungs after a 1×4
forcible expiration. In normal healthy adult human, its value is 1100 to
1200 ml.
(ii) During exhalation, the ribs moves down and inward and the diaphragm
moves up.
(iii) Tidal volume
(iv) 4>2>3>1 or 1<3<2<4

Section - E (3x5 = 15 marks)

31 Chordata, a-nerve chord,b-Notochord,c-Pharyngeal gills slits 5
d-Post anal tail,
Spiny anteater–(any other) Bat

Any two correct points

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OR

Correct Explanation (3Marks)
Correct explanation (2Marks)

32 Correct representation 2+3=5

Correct explanation
OR
OR

Z-scheme diagram+ description 4 4+1=5

Proper Reason - 1 marks

33 i.​ A-Anaphase I -of Meiosis I 5
B- Anaphase II of meiosis II
ii.​ Anaphase II is that anaphase Iseparates homologous chromosomes,
whereas anaphase IIseparates sister chromatids.
iii.​ Anaphase I -Reduction division
Anaphase II -equational division
iv.​ Diakinesis
v.​ Recombinase
OR

(3+1+1)

a)The cell cycle is divided into two basic phases: l
A cell cycle is an ordered sequence of events by which a cell duplicates its
genome,
synthesizes the other constituents of the cell and eventually divides to
form two daughter cells.
It has four stages- G1, S, G2 and M phase. The interphase is the longest
phase as it includes G1, S and G2 phases of the cell cycle.
b)any correct difference between the two
c)16 cells with 24 chromosomes

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