Biology Sample Question Paper Sheet - Class Xii, Central Board Of Secondary Education, 2010 Page 17
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39OR
(10) Certain molecular processes are given in column (A). Provide the terms given to these processes in
column (B), after selecting them from the terms: Recombination, gene regulation, prokaryotic,
transcription, eukaryotic transcription, translation, replication, gene transfer, DNA fingerprinting
Column A
Column B
(i)
DNA
DNA
______________________________
(ii)
DNA
hnRNA
______________________________
(iii)
mRNA
Protein
______________________________
(iv) Repressor Protein
______________________________
+ Operator
No transcription
½ × 4 = 2
(11) In the following table the ecological units are mentioned in the first column vertically and their attributes
are mentioned horizontally. Match the ecological units and its attribute and put a tick in the blanks
within the table:
2
Attribute
Age
Flow of
Natality
Predator-prey
→
Ecological
Energy
relationship
↓
Unit
Individual
organism
Population
Community
Ecosystem
(12)
In the T.S. of a mature anther given below identify “A” and “B” and mention their function.
(13) In the table given below, select and enter one correct device out of the following :
Oral pill, condom, Copper T, Saheli, Vasectomy, Diaphragm, Tubectomy, Cervical cap
17
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