DGE Tamilnadu Class XII Bio-Botany Sample Question Paper : Directorate of Government Examination

Name of the Board : Tamilnadu Directorate of Government Examination
Name of the Exam : HSC – XII STD
Subject : Bio- Botany
Document Type : Sample Question Paper

Website : http://dge.tn.gov.in/
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/857412Bio.pdf

DGE Bio-Botany Sample Question Paper

Time allowed : 3.00 Hrs
Maximum Marks : 75

Related : Directorate of Government Examination DGE Tamilnadu Class XII Bio – Zoology Sample Question Paper : www.pdfquestion.in/8587.html

Instructions

Bio-Botany – 1½ Hrs and Bio-Zoology – 1 ½ Hrs
Section – A : 14 x 1 = 14
Note :
1. Answer all the questions.
2. Choose and write the correct option.
3. Each question carries one mark.

Model Questions

1. The bionomial system of nomenclature was introduced by
a. Carolus Linnaeus
b. Gaspard Bauhin
c. Robert Brown
d. Dalton Hooker

2. Plants having flowers with conical thalamus are placed in
a. disciflorae
b. calyciflorae
c. thalamiflorae
d. inferae

3. Anthers are reniform in
a. Malvaceae
b. Solanaceae
c. Euphorbiaceae
d. Liliaceae

4. The meristem that is parallel to longitudinal axis of the plant is
a. procambium
b. intercalary meristem
c. phellogen
d. apical meristem

5. In maize, the conjunctive tissue is made up of
a. parenchyma
b. collenchyma
c. sclerenchyma
d. aerenchyma

6. L-shaped eukaryotic chromosome is named as
a. telocentric
b. acrocentric
c. sub-metacentric
d. metacentric

7. Dihybrid test cross coupling ratio is
a. 1:1:1:1
b. 7:1:1:7
c. 1:7:7:1
d. 7:1:7:1

8. It is used to join the two DNA fragments
a. Restriction enzyme
b. Ligase
c. Polymerase
d. Topoisomerase

9. The alga used for single cell protein production is
a. Pseudomonas
b. Alkaligenes
c. Spirulina
d. Volvoriella

10. An example for C4 plant is
a. Maize
b. Tribulus
c. Amaranthus
d. Sugarcane

11. Dickens discovered
a. pentose phosphate pathway
b. glycolysis
c. amphibolic pathway
d. C2 cycle

12. The hormone synthesised in large amounts by tissues undergoing ageing is
a. auxin
b. gibberellin
c. cytokinin
d. ethylene

13. Pyricularia oryzae causes
a. blase disease of rice
b. tikka disease of groundnut
c. citrus canker
d. tungro disease of rice

14. Which one of the following is an antimalarial drug?
a. Ephedrine
b. Digoxin
c. Quinine
c. Morphine

Section B : 7 x 3 = 21
Note :
1. Answer any 7 questions.
2. Each question carries 3 marks.

15. State any three medicinally useful plants of Solanaceae and write of their uses.
16. Draw the floral diagram of Allium cepa and write the floral formula.
17. What is bicollateral vascular bundle? Give example.
18. Draw the structure of aerenchyma. Label the parts.
19. Draw the structure of chromosome. Label the parts.
20. What three sentences about splicing?
21. Differentiate cyclic and non-cycle photophosphorylation.
22. In Krebs cycle isocitric acid is converted to a-ketoglutaric acid. The farmer is 6 carbon compound and the latter is 5 carbon compound. How does it take place?
23. Is it possible to shorten the time of crop maturity? Support your answer.
24. What is bio-war?

Section C : 4 x 5 = 20
Note :
1. Answer any 4 questions.
2. Answer to 25th question is compulsory and this question should not be left as option.
3. Draw diagrams wherever necessary.
4. Each question carries 5 marks.

25. State the importance of herbarium.
26. What is meristem? Explain different types of meristems.
27. Describe the structure of tRNA.
28. Explain the steps involved in gene transfer in plants.
29. Bring out the physiological effects of auxin.
30. Explain cyclic photophosphorylation.
31. Write the benefits of bio-fertilizers.

Section D : 2 x 10 = 20
Note :
1. Answer any 2 questions.
2. Draw diagrams wherever necessary.
3. Each question carries 10 marks.

32. Describe Hibiscus rosa-sinensis in technical terms.
33. a. Give an account on epidermal tissue system in plants. (5 Marks)
b. Bring out anatomical differences between dicot and monoct stems. (5 Marks)
34. Explain as to how protoplasmic fusion can bring about somatic hybridization in plants?
35. What is glycolysis? Explain the steps involved in it.

Class XII Botany :
Time allowed : 3.00 Hrs
Maximum Marks : 150
Note :
1. Answer all the questions.
2. Choose and write the correct option.
3. Each question carries one mark.

1. Bentham and Hooker’s classification of plants is an example for
a. artificial system
b. natural system
c. phylogenetic system
d. sexual system

2. ‘Origin of species’ had given stimulus for the creation of classification of plants called
a. sexual system
b. natural system
c. phylogenetic system
d. artificial system

3. Plants having flowers with petals fused with one another are placed under
a. polypetalae
b. gamopetalae
c. apetalae
d. calyciflorae

4. Solanaceae is placed under
a. malvalaes
b. rosales
c. polemoniales
d. unisexuales

5. Monothecous anthers are seen in the members of
a. Malvaceae
b. Asteraceae
c. Fabaceae
d. Liliaceae

6. Vexillary aestivation is seen in the corolla of
a. Malavaceae
b. Asteraceae
c. Solanaceae
d. Fabaceae

7. The type of aestivation seen in the perianth of female flowers of Cocos nucifera is
a. twisted
b. descendingly imbricate
c. valvate
d. ascendingly imbricate

8. Lacunate collenchyma is seen in
a. Ipomea
b. Helianthus
c. Datura
d. Nicotiana

9. Root hair develops from
a. trichoblast
b. trichome
c. subsidiary cell
d. rhizodermis

10. Hypodermis of maize stem is made up of
a. parenchyma
b. collenchyma
c. sclerenchyma
d. chlorenchyma

11. The vascular bundles are collateral, open and endarch in
a. monocot stem
b. monocot root
c. dicot root
d. dicot stem

12. Bundle sheath in dicot leaf is made up of
a. chlorenchyma
b. parenchyma
c. sclerenchyma
d. collenchyma

13. One of the stop codons is
a. UAA
b. AAA
c. CCC
d. CCA

14. The unit of genetic map is
a. codon
b. lux
c. micrometre
d. Morgan

15. The 17th human chromosome is
a. metacentric
b. submetacentric
c. telocentric
d. acrocentric

16. Trisomy is represented by
a. 2n – 1
b. 2n – 2
c. 2n + 2
d. 2n + 1

17. Unorganized mass of undifferentiated tissue is called
a. explant
b. callus
c. somatic embryo
d. inoculum

18. The enzyme which cleaves DNA at very specific places is called
a. ligase
b. polymerase
c. primase
d. restriction enzyme

19. The fusogenic agent used in protoplasmic fusion is
a. manitol
b. sorbitol
c. polyethylene glycol
d. hypochlorite acid

20. The name enzyme was coined by
a. Buchner
b. Pasteur
c. Fischer
d. Kuhne

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