CBSE Guess Paper: 2011
Class- XII
(Biology-Theory)
Time allowed: 3 hours
Maximum Marks:70
Instructions:
1. Q- 1-8 CARRY 1 MARKS EACH
2. Q- 9-18 CARRY 2 MARKS EACH
3. Q 19-27 CARRY 3 MARKS EACH
4. Q-28-30 CARRY 5 MARKS EACH
5. Alwyas draw neat and labelled digram whetther asked or not
6. Give answer according to marks in order to save time..
SECTION – A
Q.1. HOW THE SENSTIVITY OF THE TECHNIQUE "DNA FINGERPRINTING" CAN BE INCREASED ? (1 Marks)
Q.2. WHY THE PYRAMID OF BIOMASS IN SEA IS GENRALLY INVERTED?(1 Marks)
Q.3. NAME THE FOLLOWING
A. IMMUNOGLOBIN ACTS AS MEDITATOR IN ALLERGIC RESPONSES
B. BIOLOGICAL RESPONSE MODIFIER WHICH HELPS IN DESTROYING TUMOR H (1/2 + 1/2
Marks)
Q.4. DO EUKARYOTIC CELS HAVE RESTRICTION ENDONUCLEASES?.JUSTIFY (1/2 +1/2 Marks)
Q.5. NAME THE IMPROVED VARIETY OF RAPESEED MUSTARD THAT IS RESISTANT TO APHIDS. (1 Marks)
Q.6. STATE GAUSE'S COMPETITION EXCLUSION PRINCIPLE. (1 Marks)
Q.7. NAME ONE KEY CONCEPT OF DRAWINAIN THEORY OF EVOLUTION OTHER THAN NATURAL SELECTION. (1 Marks)
Q.8. WHAT ARE SOMACLONES?.(1 Marks)
SECTION -B
Q.9. GIVE THE SEQUENCES OF EVENTS IN"MULTIPLE OVULATION EMBRYO TRANSFER TECHNOLOGY PROGRAMME" FOR INCREASING THE HERD SIZE IN CATTLE (1/2 * 4 =2 Marks)
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