Class 11 Sample Paper Biology (Half Yearly)

SAMPLE
PAPER
Half Yearly Examination

Prepared For
NCERT BASED SYLLABUS
Applicable For
CBSE BOARD AND STATE BOARD USING NCERT

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HALF YEARLY EXAMINATION
SAMPLE QUESTION PAPER
Class - XI Subject – Biology
Time – 3 Hours Maximum Marks-70

General instructions

1. All questions are compulsory.
2. The question paper has four sections: Section A, Section B, Section C and Section D. There
are 33 questions in the question paper.
3. Section-A has 14 questions of 1 mark each and 2 case-based questions. Section-B has 9
questions of 2 marks each. Section-C has 5 questions of 3 marks each and Section-D has 3
questions of 5 marks each.
4. 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
1. What is the unit of classification? [1]
2. Why are Deuteromycetes known as ‘Imperfect Fungi’? [1]
3. What are Gemma ? [1]
4. Why are Platyhelminthes known as flatworms? [1]
5. What is a staminode ? [1]
6. Define metabolism. [1]
7. Bryophytes are called amphibians of the plant kingdom. Justify. [1]
8. What does the term ‘red-tides’ signify? [1]
9. Mention the role of radula in Mollusca. [1]
OR
What is meant by metagenesis ?
10. What is a perianth ? [1]

DIRECTION (Q. No’s 11 – 14)

In each of the following questions, a statement Assertion (A) is given followed by
corresponding statement of Reason (R) of the statements, mark the correct answer as

1) If both A and R are true and R is the correct explanation of A.

2) If both A and R are true, but R is not the correct explanation of A.
3) If A is true, but R is false.
4) If both A and R are false

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11. ASSERTION (A) - Slime moulds are called as fungus like animals. [1]
REASON (R) - These do not have cell wall
OR
ASSERTION (A) – Bacteria are prokaryotic
REASON (R) – Bacteria do not possess true nucleus and membrane bound cell
organelles [1]

12. ASSERTION (A) – Production of two types of spores is a pre-requisite of seed habit. [1]
REASON (R) – In pteridophytes Lycopodium is precursor of seed habit.
13. ASSERTION (A) – Aschelminthes are called pseudocoelomates. [1]
REASON (R) – In Aschelminthes mesoderm is present as scattered pouches in between
ectoderm and endoderm.
14. ASSERTION (A) – Non-living things exhibit growth, but not cell division. [1]
REASON (R) – Cell differentiation occurs exclusively in living organisms.
15. DIRECTION – Read the following and answer any four of the questions that follow:

Pteridophytes are primitive seedless vascular plants. Haeckel (1860) called these groups of
plants as ‘Pteridophytes’ because of their pinnate or feather like fronds (leaves). These
shade loving plants are few centimeters to 20 m long. The plant body of pteridophytes is
differentiated into true root, stem and leaves which are either small or large. They also
possess well-differentiated vascular tissues, i.e. xylem and phloem. Most of the
pteridophytes are homosporous with few exceptional heterosporous species. The
sporophyte produces spores and gametophyte bears antheridia and archegonia.
I. Pteridophytes mostly occur in [1]
(a) Cool,damp and shady places
(b) Dry and humid areas
(c) Hot and sunny places
(d) Freezing temperatures
II. Which is wrong about pteridophytes [1]
(a) Gametophytic phase is dominant
(b) Sporophytic phase is dominant
(c) Gametophyte is independent
(d) Rhizoids are attached to pinnae
III. Selaginella possesses [1]
(a) Strobili
(b) heterospores
(c) Sporophytic plant body
(d) All of the above

IV. Pteridophytes are also known as [1]
(a) Cryptogams

(b) vascular cryptogams
(c) Amphibious plants
(d) phanerogams

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V. ASSERTION (A) – In pteridophytes zygote produces a multicellular sporophytes.
REASON (R) – Sporophyte is the dominant phase in life cycle of pteridophytes. [1]
Choose the correct option.

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

16. DIRECTION – Read the following and answer any four of the questions that follow
The members of kingdom – Fungi are eukaryotic, heterotrophic and achlorophyllous. They
are either unicellular or multicellular forms that are made up of hyphae. The network of
hyphae forms the mycelium. These cell wall exhibiting organisms reproduce by both sexual
asexual modes. On the basis os spore formation, fungi are classified as Phycomycetes,
Asomycetes, Basidiomycetes and Deuteromycetes. Based on the mode of nutrition, fungi
are classified as saprophytic and parasitic forms. These are also found in symbiotic
association with plants.
I. Fungal cell wall is composed of [1]
(a) Cellulose and pectins
(b) Chitin and glycoproteins
(c) Chitin, glycoproteins and glucans
(d) Pectins, chitin and cellulose
II. Club-fungi is [1]
(a) Phycomycetes
(b) Deuteromycetes
(c) Basidiomycetes
(d) Ascomycetes

III. The spores that help fungi to undergo asexual reproduction during favourable
conditions is [1]
(a) Zoospores
(b) aplanospores
(c) conidia
(d) All of these

IV. Sexual reproduction in Ascomycetes occurs through [1]
(a) Somatogamy of zoospores
(b) Isogamy of zoospores
(c) Ascospores
(d) Both (b) and (c)
V. ASSERTION (A) – Mycelium in Deuteromycetes is aseptate [1]
REASON (R) – Phycomycetes possess septate and branched mycelium
(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) Both A and R are false

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SECTION B
17. Flower is a modified shoot. Justify. [2]
OR
Stamens of a flower may be united with the other members like petals. Describe the various
types of stamens based on their attachment to the floral whorls
18. Pinus and Cycas belong to the same group. But the roots of pinus are different from that of
cycas’. Explain how? [2]
19. ‘All vertebrates are chordates but all chordates are not vertebrates.’ Justify. [2]
20. Brinjal and potato belong to the same genus Solanum but to two different species. What
defines them as separate species? [2]
21. What is the importance of pneumatic bones and air sacs in Aves? [2]
22. Fungi are cosmopolitan, write the roles of fungi in your daily life. [2]
OR
How are viruses different from viroid?
23. Endoparasites are found inside the host body. Mention the special structures possessed by
then which enables them to survive in the adverse conditions. [2]
24. How are Liverworts different from Mosses? [2]
25. a) Lichens are good pollution indicators. Justify.
b) Draw a labelled diagram of a bacteriophage. [2]

SECTION C
26. Give reasons :
a) Cyanobacteria are used in agricultural fields for crop production
b) Diatoms are called ‘ chief producers of ocean’.
c) Euglenoids are called ‘mixotrophs’ [3]
27. Compare the three classes of algae on the basis of:
(i) Major pigments
(ii) Stored foods
OR
Explain the following with reasons:
a) The leaves of gymnosperms are needle like, have thick cuticle and sunken stomata.
b) The spread of living pteridophytes is limited restricted to narrow geographical
regions.
c) Bryophytes are of little economic importance but Sphagnum is of great economic
importance. [3]
28. Describe the different types flowers based on the position of the ovary [3]
29. Name the following
a) A limbless amphibian
b) Excretory organs in arthropoda
c) Free floating form of Cnidaria

d) Stinging organ of jelly fishes
e) Lateral appendages in aquatic annelids
f) An organ which regulates buoyancy [3]

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30. Write a note on Archaebacteria. [3]

SECTION D

31. What is placentation? Describe the various types of placentations found in the flowering
plants.
OR
What is aestivation? Discuss the major types of aestivation seen in a flower. [5]
32. (a) ‘The study of the nature of body cavity and coelom in the classification of animals is
important’. Support this statement with examples.

(b) ‘Mammals are most adapted amongst the vertebrates’. Give four points to justify the
statement.
OR

(a) Give three major differences between chordates and non-chordates.
(b) Comment upon the habitats and features of animals belonging to class Amphibia and
Reptilia [5]
33. (a) Draw a well labeled diagram of the gametophyte and sporophyte of funaria.

(b) Briefly describe the main features of bryophytes.
OR

(a) Mention the four classes of pteridophytes
(b) Write a note on the economic importance of algae and gymnosperms [5]

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