Karnataka 2nd PUC BIOLOGY (June 2008) Question Paper

Code No. 36

June, 2008
BIOLOGY

Time : 3 Hours 15 Minutes Max. Marks : 100

Instructions :
i) Draw diagrams wherever necessary.
ii) Unlabelled diagrams do not get any marks.

PART I — ( BOTANY )

PART – A

Answer the following questions in one word or in one sentence each :5 × 1 = 5
1. Write the initiator codon.
2. Name the simple living tissue in plants.
3. Define guttation.
4. Name the energy currency of the cell.
5. Name the hormone responsible for bolting in biennial plants.

PART – B

Answer any five of the following in 2 to 5 sentences each : 5 × 2 = 10

6. List the different kinds of nucleotides in RNA.
7. Mention the tools used in Genetic engineering.
8. Differentiate between trachea and tracheid.
9. Define water potential. Mention its components.
10. Define growth. Mention one example each for growth promoter and growth
inhibitor in plants.
11. Mention any two commercial applications of Naphthalene Acetic Acid
( NAA ).

PART – C

Answer any four of the following in about 200 to 250 words each
wherever applicable : 4 ∞ 5 = 20

12. List and explain any five features of Genetic code.
13. Explain the steps involved in DNA fingerprinting technique.
14. Explain the steps involved in super-ovulation and embryo transfer in cattle
breeding.
15. What is secondary growth ? Explain extrastellar secondary growth in dicot
stem.
16. Describe Munch's mass flow hypothesis with an experimental model.
17. State Blackman's law of limiting factors. Explain any four external factors
affecting the rate of photosynthesis.

PART – D

I. Answer any one of the following : 1 ∞ 5 = 5

18. Write the schematic representation of Kreb's cycle with the
preparatory phase.
19. Give reasons for the following in one sentence each : 5 ¥ 1 = 5
a) Eukaryotic genes are split genes.
b) Golden rice plant is a transgenic plant.
c) As the wind blows the rate of transpiration increases.
d) RQ value of glucose is 1.
e) Carotenoids and Xanthophyll are called accessory
photosynthetic pigments.
( Questions only from the Practical syllabus )
II. Answer any one of the following : 1 ∞ 5 = 5
20. a) Draw a neat labelled diagram of T.S. of young monocot root
( enlarged portion ) to show anatomical details. 4
b) Name the tissue in the hypodermis of Dicot stem. 1
21. Explain potato osmoscope experiment with labelled diagram. 57 Code No. 36

PART II — ( ZOOLOGY )

PART – E

Answer the following questions in one word or one sentence each :5 ∞ 1 = 5

22. Write the phenotypic ratio of monohybrid cross.
23. What is afforestation ?
24. Name the gametokinetic factor.
25. Define cardiac output.
26. Name the organic connection between the mother and foetus that helps in
the physiological exchange.

PART – F

Answer any five of the following in about 2 to 5 sentences each :5 ∞ 2 = 10

27. Mention the possible blood groups of the progeny whose mother is
heterozygous for Group-A and father is heterozygous for Group-B.
28. Differentiate between species diversity and habitat diversity.
29. What is soil erosion ? Mention any two methods of soil conservation.
30. Write any two differences between T-Lymphocytes and B-Lymphocytes.
31. What is hyperacidity ? Mention two causes.
32. List the differences between sperm and ovum.

PART – G

Answer any four of the following in about 200 to 250 words each
wherever applicable : 4 ∞ 5 = 20

33. Define criss-cross inheritance. Explain this with reference to colour
blindness in man.
34. What is Biodiversity depletion ? Explain any four anthropocentric causes
of biodiversity depletion.Code No. 36 8
35. Define breathing. Explain the mechanism of breathing.
36. List any five hormones of the adenohypophysis ( anterior lobe ) and
mention one function each of them.
37. Explain the steps involved in urine formation.
38. Explain the generalised structure of ovum.

PART – H

I. Answer any one of the following : 1 ∞ 5 = 5
39. Draw a neat diagram of the sagittal section of human brain and label
the following parts :
Cerebrum, Cerebellum, Pons, Medulla oblongata, Corpus callosum,
Hypothalamus, Pituitary, Sulcus. 5
40. Give reasons for the following in one sentence each : 5 ∞ 1 = 5
a) Alleles I
A and I
B are co-dominant.
b) Accumulation of CO 2 in the atmosphere results in global
warming.
c) In the absence of Enterokinase, protein digestion is incomplete.
d) During fasting, the level of glucagon increases in blood.
e) Cleavage in frog's zygote results in unequal blastomeres.
( Questions only from the Practical syllabus )

II. Answer any one of the following : 1 ∞ 5 = 5

41. a) Draw a neat diagram of hepatic lobule and label the following
parts : 4
Hepatic triad, Hepatic chord, Sinusoids, Central vein, Hepatic
artery, Hepatocyte.
b) Name the connective tissue covering of liver. 1
42. a) Draw a neat labelled diagram of areolar tissue. 4
b) Name the biochemical test to detect the presence of glucose in
the urine of diabetic.

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