ST BRITTO’S MATRIC HIGHER SEC SCHOOL
PRE HALFYEARLY – I
CLASS XII
2015-2016
SUBJECT-BIOLOGY
PART A – BIO-BOTANY
MAX MARKS 75
I CHOOSE THE CORRECT ANSWER
14 X 1 = 14
1. The number of high energy terminal bonds present in ATP is –
a. One b. Two c. Three d. Four
2. Cisaconitic acid is converted to isocitric acid by the addition of a molecule of water. This
reaction is catalysed by—
a. citric acid synthetase b. fumerase c. malic dehydrogenase d. aconitase
3. Which of the following is a 5C compound?
a. phosphoglyceraldehyde b.Erythrosephosphate c.Xylulose phosphate
d.Sedoheptulose
phosphate
4. The chemical used to eradicate weeds in the field is—
a. 2, 4, D
b. IAA
c. ABA
d. Urea
5. Which of the following is a long day plant?
a. tobacco
b. sunflower
c. maize d. wheat
6. An example for insectivorous plant is--a. Drosera b.Viscum c. Monotropa d. Vanda
7. Which pathogen causes the blast disease of rice?
a .Cercospora personata b. Pyricularia oryzae c. Tungro virus
d. Xanthomonas citri
8. ------ is extracted from the inflorescence of chrysanthemum
a. vaccines b. pyrethrum c. quinine c.digoxin
9. Binomial of vilvam is---a. Acalypha indica b. Aegle marmelos c.Mimosa pudica d. Solanum nigrum
10. Sake an alcoholic beverage is extracted from ---a. rice b. groundnut c. wheat c.cotton
11. ------------ is called as the super bug
a. Pseudomonas putida b. E.coli c.Agrobacterium tumifacians d.Bacillus lacti
12. In tomato ---- enzyme breaks the ripening process
a. ligase b.cellulase c.polygalactronase d.pyrophosphorylase
13. Enriched vitamin tablets are produced from the following organism for human
Consumption
a. Nostoc
b. Yeast
c. mushroom
d. Spirulina
14. A toxic protein called delta endotoxin is insecticidal and it is produced by
a. Escherichia coli b. Streptomyces griseus c. Bacillus thuringiensis d. Bacillus lactii
II ANSWER ANY SEVEN OF THE FOLLOWING
7 X 3 = 21
15. What is called bioremediation?
16. What is the importance of E.coli in biotechnology?
17. Name any three genetically engineered products and its function
18. What is photolysis of water?
19. Define respiratory quotient .Give one example
20. What is called phytohormones?
21. Write any two advantages of vernalization
22. Define biomedicines .Give example
23. What is called soil reclamation?
24. What are the major aspects of plant breeding?
III ANSWER ANY FOUR OF THE FOLLOWING,25TH QUESTION IS COMPULSORY
4 X 5 = 20
25. Write the difference between C3 and C4 pathway
26. Write short note on the site of photosynthesis
27. Explain Ganong’s respiroscope
28 Write the economic importance of teak
29. Write the aims of plant breeding
30. Give an account of SCP
31. How are foreign genes introduced on to the plants?
IV ANSWER IN DETAIL FOR ANY TWO OF THE FOLLOWING
2 X 10 =20
32. Explain Krebs cycle [flow chart]
33.a. Bring out the physiological effects of auxin
b.Write the significance of pentose phosphate pathway
34. Explain how protoplasmic fusion can bring somatic hybridization in plants
35.Write an essay on plant tissue culture