NAVODAYA VIDYALAYA SAMITI NEW DELHI
SAMPLE PAPER-1
Class: XII BIOLOGY (Theory)
Time : 3 Hours Max. Marks : 70
General Instructions :
(i) All questions are compulsory.
(ii) This question paper consists of four Sections A, B, C and D. Section A contains 8
questions of one mark each, Section B is of 10 questions of two marks each, Section
C is of 9 questions of three marks each and Section D is of 3 questions of five marks
each.
(iii) There is no overall choice. However, an internal choice has been provided in one
question of 2 marks, one question of 3 marks and all the three questions of 5 marks
weightage. A student has to attempt only one of the alternatives in such questions.
(iv) Wherever necessary, the diagrams drawn should be neat and properly labelled.
Section - A
1. What represents the period between birth and natural death of an organism?
2. The meiocyte of a maize plant gamete contains 10 chromosomes. Workout the
number of chromosomes found in its endosperm.
3. What is F1 stands for in Mendelian Inheritance?
4. Pick out the ancestral line of Genaltes from the list given below -
Psilophyton, seed ferns, and conifers
5. What you call cancer causing viruses?
6. What is transformation?
7. What is the role of following organisms in ecosystem?
8. Which animals are not found in Kerala forests?
Section - B
9. Identify the A, B, C and D in cut section of anther.
10. A couple wanted to adopt a method of contraceptions to delay/give gap between the
two childrens. Suggest such any two methods in male / female partner.
OR
Biology SQP I 1 GRC series 1/44
What is infertility? Name any two main causes of infertility in male and female.
11. Label 1 & 2 in Figure A and 2 & 3 in figure B.
12. Name the proteins produced by virus infected cells. How they provide immunity?
Also name the kind of immunity provided by it.
13. Classify the following into active immunity and passive immunity.
Colostrum, Polio Vaccine, Snake venome, HB
14. What is LAB? Give reason why LAB is commonly used in house hold products?
15. What is the condition of body attacks own cells? Give two examples of it.
16. What are the latest methods of treatment of cancer?
17. Give the words for:-
(a) A organisms can tolerate and thrive in a wide range of temperatures
(b) A organism restricted to a narrow range of temperatures
18. State whether the following are true or false -
(i) High temperature inhibits decomposition
(ii) No energy that is trapped into an organism remains in it for ever.
(iii) The basic requirement for any ecosystem to function and sustain is solar energy.
(iv) The pyramid of energy is always inverted. It can never be upright.
Section - C
19. How does the flower of maize and cannabis are pollinated? What are the features found
in these flowers for such type of pollination?
20. In a following plant, a student crossed two flower characters, he got F1 offspring’s
different from the both parents.
(i) Give the Phenotype & genotype of “a” and “b”
(ii) What you call such type of one gene interaction?
(iii) What is the Phenotypic & genotypic ratio in this
situation in F2?
21. (i) Name the process shown below.
(ii) Label A, B, C and D in given diagram.
Biology SQP I 2 GRC series 1/44
22. Fill up the missing gaps in given flow chart.
23. (i) Name the widely used diagnostic test when a person gets AIDS disease.
(ii) Explain the multiplication of its causative organism in infected person.
OR
How the following diseases are spread from one to another give cause of each.
(a) Ascariasis (b) Pneumonia
24. Arrange the following based on Food chain. What would happen to the population of
top tropic level organism? Explain giving reasons.
25. (i) Name the restriction enzyme that recognises GAATTC
(ii) Name the enzyme that can link the two DNA fragments.
(iii) What are palindrome in DNA?
26. (i) Name the technique used to separate DNA fragments in rDNA technology.
(ii) Name the compound used to visualise these DNA fragments in this technique
(d) Define elution.
Biology SQP I 3 GRC series 1/44
27. Name and Explain the steps involved in PCR.A specific enzyme helps in amplication
in PCR. Name the bacterium from which it is Isolated .
Section - D
28. Name the following with reference to testis:-
(a) Cells which provide nutrition to the sperm.
(b) Number of testicular tubules in each testis
(c) Regulate the temperature for normal spermatogenesis.
(d) Cells which synthesize male hormone.
(e) The process of transform spermatid into sperm.
OR
Name the label 1 to 10 in given beloq diagram
29. By analyzing genetic code answer the following.
(i) How many codons code for amino acids?
(ii) Name the codons which does not code for any amino acids.
(iii) What is unambiguous and degenerative property?
(iv) The codon which perform dual functions?
OR
Give a diagrammatic representation of Miller’s experiment.
(i) What are the conditions of the atmosphere of the primitive?
(ii) In what form was the energy supplied for the chemical reaction to occur?
30. What are Evil Quartet with respect to biodiversity? Explain.
OR
(a) What are the efforts made by Delhi government to improve the quality of air?
(b) What are Euro II norms?
Biology SQP I 4 GRC series 1/44
