biology set ii

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SAMPLE QP FOR XI HALF-YEARLY EXAMINATION

SUB: BIOLOGY

CLASS - XI

TIME: 3 HOURS M.M: 70

General Instructions:

1. All questions are compulsory.

2. This question paper consists four Sections A, B, C and D.

a. Section - A contains 5 questions of 1 mark each

b. Section -B contains 5 questions of 2 marks each

c. Section -C contains 12 questions of 3 marks each

d. Section D contains 3 questions of 5 marks each and one question of 4

marks (Value Based Question).

3. There is no overall choice. However, an internal choice has been provided in

one question of 2 marks, one question of 3 marks and all the three questions

of 5 marks weightage. Attempt only one of the choices in such questions.

4. Wherever necessary, the diagrams should be drawn neat and properly labeled.

___________________________________________________________________

SECTION - A

1. Name the smallest living cell that completely lacks a cell wall and can survive

without oxygen. 1

2. What are viroids? 1

3. In some plant species roots come out of the ground and grow vertically

upwards to get oxygen for respiration. What are such roots called? 1

4. What are the components of blood? 1

5. What is a peptide bond? 1

SECTION - B

6. Differentiate between action spectrum and absorption spectrum with respect

to photosynthesis. 2

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7. What do you understand by “Binomial Nomenclature”? Name the scientist

who had proposed this system. 1+1=2

8. State the cell theory as understood today.

OR 1+1=2

Based on the position of centromere, the chromosomes can be classified into

four types. What are they? ½×4=2

9. How are secondary metabolites useful to human welfare? Give two examples

of it. 2

10. What do you understand by alternation of generation? Explain with any one

pattern of plant life cycle? 2

SECTION - C

11. Draw a well labeled diagram of a sectional view of chloroplast and label the

sites for light reactions and dark reactions. 2+½+½= 3

12. Mention the criteria for essentiality of an element. Give one example of an

essential element. 3

13. Differentiate between skeletal muscles, smooth muscle, and cardiac muscle

(at least two points in each) (½ ×2) ×3=3

14. Explain the structure of plasma membrane as proposed by Singer and

Nicolson (1972). With diagram 3

15. Cnidarians exhibit two basic body forms. What are they? How do they differ

from each other? Give one example in each. 3

16. Algae are divided into three main classes. What are the three classes?

Differentiate them on the basis of photosynthetic pigment and stored food. 3

17. Flowers can be classified into three types on the basis of position of ovary

with respect to other floral parts. What are they? Explain with example. 3

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18. Experiments were carried out to investigate the effect of different pH values

on enzyme activities. (Time and temperature was kept constant) 1+2=3

a) What interpretation can you draw from the graph?

b) What happens to the pepsin reaction between pH 4 and 5? Why?

Observe the given graph and answer:-

19. Vascular bundles are often referred sometimes as closed /conjoint / radial.

Explain the three terms, where do we notice such condition. 3

20. What is the significance of meiosis? How does meiosis differ from mitosis? 3

OR

What are the sub stages of prophase I of Meiosis I? Explain briefly. 3

21. What is facilitated diffusion? How symport transport is different from antiport

transport? 3

22. Discuss the factors responsible for ascent of xylem sap in plants. 3

SECTION D (Value Based Question)

23. A) Swathi is a member of NGO. She wants to have a campaign in nearby

slum areas. What awareness about personal hygiene should be given?

Enzyme

activity

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B) What sanitation measures for maintaining social and public hygiene in their

areas should be given? 2+2=4

SECTION-D

24. Draw a well labeled diagram showing the alimentary canal of cockroach (label

at least six parts). Why cockroaches are called “uricotelic” insect?

(6×½)=3+2=5

OR

Classify simple epithelium tissue on the basis of structural modification of the

cells. Where do we find ciliated epithelium in human body. Differentiate

between Endocrine gland and Exocrine gland. 3+2=5

25. Mention the phylum along with one example with reference to the distinctive

features mentioned below (½+½)=1 X5=5

a) Water vascular system :

b) Malpighian tubule :

c) Cnidoblasts present:

d) Triploblastic Acoelomate animals:

e) Bioluminescence and comb plates:

OR

Differentiate between chordates and Non-Chordates; give an outline of

classification of the sub - phylum Vertebrata up to class level 2+3=5

26. Explain how Nitrification is different from Nitrogen fixation. Mention the

role of Thiobacillus in nitrogen cycle? What do you understand by biological

Nitrogen fixation? 2+1+2=5

OR

Name the technique of growing plants in soil free, nutrient solution? What is

the basic purpose of the experiment? Name one sulphur containing amino

acids. State the role of Mg2+ in plants. Name one free living nitrogen fixing

cyanobacteria. 1+2+½+1+½ = 5

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(MARKING SCHEME)

SECTION-A

27. Mycoplasma 1

28. Infectious agent, smaller than virus / infectious RNA lacks protein coat. 1

29. Pneumatophores. 1

30. Plasma, RBC, WBC and platelets. 1

31. Bond present between the –COOH group of one amino acid and -NH2 group

of next amino acid to form a di-peptide , releasing one molecule of water. 1

SECTION-B

32. Correct any 2 differentiations. 2

33. System of providing scientific name with two components.

Carolus Linnaeus 1+1=2

34. All living organisms are composed of cells and products of cell

All cells arise from pre existing cells. 1+1=2

Or

Metacentric, sub metacentric, acrocentric, telocentric ½×4=2

35. Some useful substance such as drugs, spices, rubber scents, and pigments

are derived from it? Any two correct eg. Refer table 9.3 pg. 146

(1+0.5+0.5)

36. Correct answer?( alternation of haplontic and diplontic phase in the life cycle

of an organism) with one lifecycle pattern. 2

SECTION-C

37. Diagram - 2

Thylakoid membranes/ membrane system of granna- light reactions and

stroma - dark reactions. ½+½= 1

38. Three criteria (refer pg. 195). Mg2+ or any other. 3

39. Each correct point ½ marks (½ ×2) ×3=3

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40. Correct explanation with diagram of fluid mosaic model of Singer and

Nicolson. 1.5+1.5=3

41. Polyp – sessile, it produces Medusa asexually e.g. Hydra , Adamsia and

Medusa –free floating, produces polyp sexually , e.g. Obelia.(1.5+1.5=3)

42. Chlorophyceae, Phaeophyceae and Rhodophyceae ; refer table 3.1 pg33.

( ½ + ½ ) X 3=3

43. Hypogynous-eg. Mustard, perigynous- eg. Plum , rose, and Epigynous-

guava, cucumber ( or any other correct example) 3

44. Experiments were carried out to investigate the effect of different pH values

on enzyme activities. (Time and temperature was kept constant) 1+2=3

c) Every enzyme has an optimum pH to perform it maximum , in pepsin the pH

value is 2.5(acidic) and in amylase the pH value is7.5 (alkaline) (approx)

d) In pH 4 it activity decreases drastically and pH5 it stops functioning

45. Vascular bundle –

closed –when cambium is absent between xylem and phloem , found in

monocot stem.

Conjoint- xylem and phloem are present in same radius of Vascular bundle,

found in stems.

radial - xylem and phloem with in a Vascular bundle are arranged in alternate

manner, found in roots. 1+1+1=3

46. Maintain constant chromosome number among sexually reproducing

organisms . Bring variations or any proper differences 1+2=3

OR

Leptotene, zygotene, pachytene, diplotene and diakinesis (0.5x6=3)

47. facilitated diffusion- diffusion with the help of proteins. symport – 2 different

molecules in same direction. antiport - 2 different molecules in opposite

direction. 1+1+1

48. Cohesion , Adhesion , Surface tension. Brief explanation 1+1+1

49. Correct logical answer( 2 for personal hygiene and 2 for public hygiene.

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SECTION-D

50. Correct diagram (label at least six parts ½ X6 =3). “uricotelic” insects

because of uric acid as nitrogenous waste product.(2)

OR

Correct Classification.2

Bronchioles and fallopian tube 1

Differentiation (1+1) 3+2=5

51. (½+½)=1 X5=5

f) Water vascular system : Echinodermata-correct e.g

g) Malpighian tubule : Arthropoda correct e.g

h) Cnidoblasts present: cnideria correct e.g

i) Triploblastic Acoelomate animals: Platyhelminthes - correct e.g

j) Bioluminescence and comb plates:. Ctenophore- correct e.g

Or

Refer table 4.1 pg55 and pg 56 2+3=5

52. Conversion of ammonia into Nitrite and then to Nitrate by chemoautotrophs

Nitrogen fixation- conversion of atmospheric N2 to ammonia .

Denitrification

Reduction of ammonia by free living organisms. 2+1+2=5

Or

Hydroponics 1

To understand to role of different nutrients, deficiency symptoms etc 1

Cysteine or methionine. . 1

Any imp. Role of Mg 2+ . 1

Nostoc or Anabaena 1

- END -

biology set ii

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