PRELIM EXAMINATION II
CLASS XII BIOLOGY
MAX. MARKS: 70 TIME: 3 HRS
NAME____________ CLASS_____SECTION__________ ROLL NO.
This paper comprises of two Parts- I and II. Answer all Questions
PART I (20 Marks)
Q.1 (a) Answer the following as per instructions (Attempt all questions) : [8x1]
i)What is the role of Cyclosporin A and Statins in human body?
ii)State Hardy Weinberg principle of equilibrium. Write the mathematical
formula representing the law.
iii)Name any two temporary embryonic structures in vertebrates which
provide evidence for evolution.
iv)What is Amensalism?
v) Give the biological name of the causative agent of Diptheria.
vi) Name the four layers of microsporangium.
vii) In Drosophila, 2n=8. How many linkage groups are present?
viii) State Gause’s competitive exclusion principle.
b)State the best known contributions of the following: [4x1]
i)Temin and Baltimore ii) Jacob and Monad
iii) Sutton and Boveri vi) Selman Walksman
c) Define the following: [2x1]
i) Biopiracy ii) IPM
d) Give reasons for the following: [2]
i)Retrovirus is considered an exception to the Central Dogma.
ii)Thermostable DNA polymerase is needed in amplification.
e)Multiple choice questions. Choose the best option in each case: [4x1]
(i) Ontogeny recapitulates Phylogeny- is part of which evidence for
organic evolution? :
, I.pinna II.coccyx
III.tail IV.molars
(iii)Among the following, where can you find the maximum
biodiversity? :
I.Coral reefs
II.Mangroves
III.Alpine meadows
IV.Desert
(iv)Assertion: Transcription is the mode in which DNA passes its genetic
information to RNA.
Reason: Transcription takes place in the cytoplasm of eukaryotic cells.
I.Both assertion & reason are true and reason is the correct explanation of assertion.
II.Both assertion & reason are true, but reason is not the correct explanation of assertion.
III.Assertion is true and reason is false.
IV.Both assertion and reason are false.
PART II (50 Marks)
SECTION A (7x2=14 Marks)
Q.2 Mention FOUR features of pBR322.
OR
What is Primary Productivity? Give brief description of factors that
affect Primary Productivity.
Q.3 In recent years, there has been large scale loss of biodiversity. Mention
four ways in which humans are responsible for it.
OR
What is Reproductive fitness? Explain it with the help of an example.
CLASS XII BIOLOGY
MAX. MARKS: 70 TIME: 3 HRS
NAME____________ CLASS_____SECTION__________ ROLL NO.
This paper comprises of two Parts- I and II. Answer all Questions
PART I (20 Marks)
Q.1 (a) Answer the following as per instructions (Attempt all questions) : [8x1]
i)What is the role of Cyclosporin A and Statins in human body?
ii)State Hardy Weinberg principle of equilibrium. Write the mathematical
formula representing the law.
iii)Name any two temporary embryonic structures in vertebrates which
provide evidence for evolution.
iv)What is Amensalism?
v) Give the biological name of the causative agent of Diptheria.
vi) Name the four layers of microsporangium.
vii) In Drosophila, 2n=8. How many linkage groups are present?
viii) State Gause’s competitive exclusion principle.
b)State the best known contributions of the following: [4x1]
i)Temin and Baltimore ii) Jacob and Monad
iii) Sutton and Boveri vi) Selman Walksman
c) Define the following: [2x1]
i) Biopiracy ii) IPM
d) Give reasons for the following: [2]
i)Retrovirus is considered an exception to the Central Dogma.
ii)Thermostable DNA polymerase is needed in amplification.
e)Multiple choice questions. Choose the best option in each case: [4x1]
(i) Ontogeny recapitulates Phylogeny- is part of which evidence for
organic evolution? :
, I.pinna II.coccyx
III.tail IV.molars
(iii)Among the following, where can you find the maximum
biodiversity? :
I.Coral reefs
II.Mangroves
III.Alpine meadows
IV.Desert
(iv)Assertion: Transcription is the mode in which DNA passes its genetic
information to RNA.
Reason: Transcription takes place in the cytoplasm of eukaryotic cells.
I.Both assertion & reason are true and reason is the correct explanation of assertion.
II.Both assertion & reason are true, but reason is not the correct explanation of assertion.
III.Assertion is true and reason is false.
IV.Both assertion and reason are false.
PART II (50 Marks)
SECTION A (7x2=14 Marks)
Q.2 Mention FOUR features of pBR322.
OR
What is Primary Productivity? Give brief description of factors that
affect Primary Productivity.
Q.3 In recent years, there has been large scale loss of biodiversity. Mention
four ways in which humans are responsible for it.
OR
What is Reproductive fitness? Explain it with the help of an example.
