PSEB CLASS XI BIOLOGY SAMPLE PAPER – SET 2
September Examination 2025
Subject: Biology (Code No. 054)
Maximum Marks: 70
Time Allowed: 3 Hours
General Instructions:
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All questions are compulsory.
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The question paper consists of four Sections A, B, C and D with a total of 19 questions.
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Internal choice has been provided in some questions.
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Use of diagrams wherever necessary.
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Write precise and to-the-point answers.
Section A (1 × 20 = 20 Marks)
Q.1 Answer the following (20 parts):
(i–xii) Multiple Choice Questions
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Which is the correct order of taxonomic hierarchy?
(a) Kingdom → Division → Class → Family → Genus → Species
(b) Division → Class → Order → Family → Genus → Species
(c) Kingdom → Phylum → Order → Class → Genus → Species
(d) Phylum → Family → Class → Genus → Species -
Who proposed the five kingdom system of classification?
(a) Linnaeus
(b) Whittaker
(c) Haeckel
(d) Aristotle -
Which one is not a prokaryote?
(a) Mycoplasma
(b) Cyanobacteria
(c) Bacteria
(d) Euglena -
Which disease is caused by Plasmodium?
(a) Kala-azar
(b) Malaria
(c) Sleeping sickness
(d) Ringworm -
Brown algae have:
(a) Chlorophyll a and b
(b) Chlorophyll a and c
(c) Chlorophyll a and d
(d) Chlorophyll a and f -
Cycas belongs to which group?
(a) Bryophytes
(b) Pteridophytes
(c) Gymnosperms
(d) Angiosperms -
Which one of the following is a diploblastic animal?
(a) Hydra
(b) Earthworm
(c) Ascaris
(d) Pila -
Metameric segmentation is found in:
(a) Mollusca
(b) Arthropoda
(c) Annelida
(d) Both Arthropoda and Annelida -
A typical dicot embryo consists of:
(a) Plumule, radicle and one cotyledon
(b) Plumule, radicle and two cotyledons
(c) Plumule and radicle only
(d) Radicle and cotyledons only -
The axillary bud gives rise to:
(a) Root
(b) Leaf
(c) Flower
(d) Branch -
Collenchyma cells provide:
(a) Mechanical support
(b) Conduction of food
(c) Photosynthesis
(d) Storage -
Which organelle is responsible for protein synthesis?
(a) Ribosome
(b) Mitochondria
(c) Golgi apparatus
(d) Nucleus
(xiii–xvi) Fill in the blanks:
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The father of taxonomy is __________.
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Viruses that infect bacteria are called __________.
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The male sex organ in bryophytes is __________.
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The excretory organ of earthworm is __________.
(xvii–xx) True/False:
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Mycoplasma are the smallest living cells.
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Red algae are mostly marine in habitat.
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In dicot stem, xylem is endarch.
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Cork cells are living cells.
Section B (10 × 2 = 20 Marks)
Q.2 – Q.11 (2 marks each)
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State two limitations of two-kingdom classification.
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Give two differences between cyanobacteria and green algae.
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(a) Write two characters of Chrysophytes.
OR
(b) Mention two features of slime moulds. -
(a) State two features of Porifera.
OR
(b) State two features of Coelenterata. -
What are pneumatophores? Give example.
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Define actinomorphic flower with example.
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Define endarch and exarch condition in xylem.
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(a) Write two differences between dicot and monocot leaves.
OR
(b) Mention two differences between dicot and monocot stem. -
Define plasmolysis. Give one example.
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(a) Write two differences between smooth and rough endoplasmic reticulum.
OR
(b) Write two functions of lysosomes.
Section C (5 × 3 = 15 Marks)
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(a) Draw a well labelled diagram of a bacterial cell wall structure.
OR
(b) Draw a labelled diagram of Spirogyra. -
Write three salient features of brown algae.
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(a) Write six characters of class Aves with two examples.
OR
(b) Mention six characters of class Mammalia with two examples. -
(a) Define: (i) Radial symmetry (ii) Phyllotaxy (iii) Perigynous ovary.
OR
(b) Draw diagrams of the following: (i) Monocot seed (ii) Dicot seed. -
Write short notes on: (i) Golgi apparatus (ii) Nucleolus (iii) Centrosome.
Section D (3 × 5 = 15 Marks)
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(a) Draw a well labelled diagram of dicot stem and explain three anatomical features.
OR
(b) Describe different types of aestivation with neat sketches. -
(a) Differentiate between:
(i) Bryophytes and Pteridophytes
(ii) Monocot root and Dicot root
OR
(b) Describe five adaptations in fishes for aquatic life. -
Comprehension (from Chapter 10: Cell Cycle & Cell Division):
Cell cycle is divided into two main phases – Interphase and M phase. Interphase consists of G1, S and G2 phases. M phase is mitotic phase with karyokinesis and cytokinesis. Significance of mitosis is growth and repair, while meiosis leads to gamete formation and genetic variation.
Answer the following (1 mark each):
(i) Name the three sub-phases of interphase.
(ii) Which phase of the cell cycle involves DNA replication?
(iii) What is the importance of mitosis?
(iv) Which process produces haploid gametes?
(v) Name the two steps of M phase.
Total Marks: 70
