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
Q.1 (a) Answer the following as per instructions (Attempt all questions)
Each question carries one mark
i)A doctor examines the symptoms of a patient who has a high fever
with chills. What disease could the patient be suffering from?
ii)What is the probability of having a male child if the father’s sperm
carries an X-chromosome?
iii)In the year 2021, the population of fish in a lake was 500. After one year, a
biologist found that the population had an average natality of 120, average
mortality of 65, immigration was 25 and emigration was 30. Calculate the total
number of fish that were present in the lake in 2022.
iv)Identify if the given set of structures can be classified as homologous or
analogous structures:
v)Suggest the significant role of Biotechnology in bioremediation.
vi)Give the biological name of the causative agent of gonorrhoea.
vii)After vaccination, it takes some time for the immune system to produce
antibodies. Which one of the following statement/s justifies this fact?
a)The secondary immune response does not produce enough antibodies.
b)No memory cells are produced from B-lymphocytes.
c)The primary immune response does not produce enough antigens.
, a)Character
b)Inherent
c)Homologous
d)Analogous
ix)Give a term for the following:
a)The toxin responsible for symptom of malaria.
b)A certain mass of living material at a particular time at
each trophic level.
x) What are monoclonal antibodies?
xi)If oogenesis occurs conventionally in a human, which one of the following
represents the correct ploidy levels of the primary and secondary oocytes?
Primary oocytes Secondary oocytes
a) haploid diploid
b) diploid haploid
c) haploid haploid
d) diploid diploid
xii) What is quantitative inheritance?
xiii)A student aims to insert a foreign gene into the plasmid shown below
for an experiment:
Suggest a method that can help the student in selecting the cells that contain
this plasmid.
xiv)A biotechnological firm aims to manufacture certain clotting factors to treat
Haemophilia in patients. Mention any one aspect to be considered while choosing
the transgenic animal to produce these clotting factors.
xv)Answer the following questions:
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
Q.1 (a) Answer the following as per instructions (Attempt all questions)
Each question carries one mark
i)A doctor examines the symptoms of a patient who has a high fever
with chills. What disease could the patient be suffering from?
ii)What is the probability of having a male child if the father’s sperm
carries an X-chromosome?
iii)In the year 2021, the population of fish in a lake was 500. After one year, a
biologist found that the population had an average natality of 120, average
mortality of 65, immigration was 25 and emigration was 30. Calculate the total
number of fish that were present in the lake in 2022.
iv)Identify if the given set of structures can be classified as homologous or
analogous structures:
v)Suggest the significant role of Biotechnology in bioremediation.
vi)Give the biological name of the causative agent of gonorrhoea.
vii)After vaccination, it takes some time for the immune system to produce
antibodies. Which one of the following statement/s justifies this fact?
a)The secondary immune response does not produce enough antibodies.
b)No memory cells are produced from B-lymphocytes.
c)The primary immune response does not produce enough antigens.
, a)Character
b)Inherent
c)Homologous
d)Analogous
ix)Give a term for the following:
a)The toxin responsible for symptom of malaria.
b)A certain mass of living material at a particular time at
each trophic level.
x) What are monoclonal antibodies?
xi)If oogenesis occurs conventionally in a human, which one of the following
represents the correct ploidy levels of the primary and secondary oocytes?
Primary oocytes Secondary oocytes
a) haploid diploid
b) diploid haploid
c) haploid haploid
d) diploid diploid
xii) What is quantitative inheritance?
xiii)A student aims to insert a foreign gene into the plasmid shown below
for an experiment:
Suggest a method that can help the student in selecting the cells that contain
this plasmid.
xiv)A biotechnological firm aims to manufacture certain clotting factors to treat
Haemophilia in patients. Mention any one aspect to be considered while choosing
the transgenic animal to produce these clotting factors.
xv)Answer the following questions:
