Are you searching for the AHSEC Class 12 Biology Question Paper 2012? Look no further! This article provides a detailed analysis and HS 2nd Year Biology Question Paper 2012 under the Assam Higher Secondary Education Council (AHSEC) Now Assam State School Education Board (ASSEB). Assam Board Class 12 Biology Previous Year Question Paper For students preparing for board exams, previous year question papers are a crucial resource for understanding question patterns, marks distribution, and important topics.
2012
BIOLOGY (Theory)
Full Marks: 70
Time: Three hours
The figures in the margin indicate full marks for the questions
PART - I (Botany) (GROUP-A)
What is double fertilization?
How can you determine the age of a fossil?
Why is grafting not possible in monocotyledonous plants?
What is ecological succession?
Define organic farming.
Draw a labeled diagram of L.S. of an angiospermic ovule.
Explain the significance of mutation in evolution.
What do you mean by coacervates?
Name the source organism from which T-DNA is isolated.
How does transgenic crops technique differ from normal breeding?
What are the biotic and abiotic components of an ecosystem?
Suggest any two techniques that can help in early detection of bacterial/virus infections.
What are antibiotics, and how do they prevent microbial growth?
How does totipotency help in plant propagation and improvement?
What is the full form of VAM? What is its role? Provide examples of ecto and endo mycorrhiza.
Discuss the development of a dicot embryo and how it differs from a monocot embryo.
Write short notes on any two: Polyembryony, Genetic Engineering, Bio-gas, Hardy-Weinberg principle.
PART - II (Zoology) (GROUP-B)
Fill in the blanks:
(a) Pebrine is caused by _____
(b) The milk of 'Rosie', the first transgenic cow, contains human alpha _____
(c) Ovulation is induced by a hormone called _____
(d) The total number of chromosomes in a human cell is _____Answer any two:
(a) What is frameshift mutation?
(b) Define algal bloom.
(c) Write the scientific name of African catfish.
(d) Where are decomposers abundant in a pond ecosystem?Write answers to any four of the following:
(a) What are the changes during the follicular phase of the menstrual cycle in human females?
(b) Why has amniocentesis been banned?
(c) Write a note on Haemophilia.
(d) Discuss the structure of nucleosome.
(e) What are the different types of barriers in innate immunity?
(f) What is the causative organism of Flacherie? Mention its symptoms.Write the difference between any two:
(a) T-lymphocyte and B-lymphocyte
(b) Sex chromosome and autosome
(c) Hydrarch and Xerarch
(d) Spermatogenesis and OogenesisWhat do you understand by STD? Name two STDs in man. Mention two preventive measures.
Write the goals of the Human Genome Project.
OR
Write Mendel's laws of inheritance.Discuss the causes of cancer.
OR
Write a note on Biosphere Reserves of Assam.What is the infective stage of the malarial parasite? Describe the life cycle of the malarial parasite.
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