Biology Sample Question Paper : www.nvsrochd.gov.in Navodaya Vidyalaya Samiti

Board : Navodaya Vidyalaya Samiti
Exam : Class XII Biology
Document Type : Study Material
Website : nvsrochd.gov.in

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Biology Sample Question Paper :

NAVODAYA VIDYALAYA SAMITI
Class: XII (Theory)
Time: 3 Hours
Max. Marks: 70

Related : Navodaya Vidyalaya Samiti Class XII Chemistry Question Paper : www.pdfquestion.in/6617.html

General Instruction :
(i) All question are compulsory.
(ii) This question paper consist of four section A, B, C, &D. Section A is of 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 diagram drawn should be neat and properly labeled.

SECTION-A
1. Study the figure & label part (A) & (B).
2. Which of the following are analogous organs?
(a) Fore limb of birds and fore limb of bat.
(b) Wing of bird and wing of bat.
(c) Wing of bat and the flipper of a whale.
(d) Pectoral fin of a fish and the forelimb of a frog.
3. Mention the name of gene (A) & (B) on E.coli cloning vector PBR 322.
4.Which enzyme is known as ‘Molecular scissor’?

5.A son has blood group O.
What is true of the inheritance of this blood group in his case?
(a) His mother should be with AB blood group.
(b) Both his parents should be heterozygous A group.
(c) His father could be homozygous B group.
(d) His mother could be homozygous A group.

6.Name the compound used for staining the isolated DNA in the gel.
7.Write the scientific name of the nematode that attacks the root of tobacco plant.
8.Name two diseases that can be treated by producing biological compound in transgenic
animals.

SECTION-B
Observe the representation of age pyramids for human population and mention which
one is stable and which is declining out of (A) & (B)
10. Which hormones secreted by placenta? Name the organ, which secrete relaxin.
11.What is eutrophication?  Explain its consequence on life of plants and animals in such
12.what is the role of baculo viruses in the IPM programme?
13.Fill in the blank a, b in the following table.
ORGANIC ACID MICROBE
Butyric acid ——-a—-
———–b— Aspergillus niger (fungus)

14. Chara is monoecious or dioecious.  Name the male and female sex organs.
15.What is detritus? What is mean by humification?
16.What is chasmogamous flowers and cleistogamous flower? Give example in which these two flowers produce.
17.Who discover the technique of DNA finger printing? Expand VNTR.
18. From which protein exine of pollen grain formed. What is the function of tapetum?
OR
What is the function of nacellus and PEN?

SECTION-C
19.” A population has been exhibiting genetic equilibrim”.
(a) Name the underlying principle.
(b) Take up any one such factor and explain how the gene pool will change due to that
factor.
(c) Name two factors, which affect the genetic equilibrium of the population.
20. (a) By which method DNA separates out and removes from test tube.
(b) Name the technique by which the fragment of DNA separated.
21.Which cyanobacteria used as a biofertiliser in a rice field. In which way it is useful? Name two examples.
22. Compete the following chart and name the factors, which decrease the N in given area.
23. (a) what is insecticidal protein?

24. Fill in the blank a, b, c, d, e and f in the following table.
ORGANISM DISEASE
———a– Typhoid
Pneumonia ———b—
——–c— Ring worms
———-d—- Ascariasis
Wuchereria bancrofti ——–e—–
Entamoeba histolytica ——–f—–

25.Write central dogma of protein synthesis. How many initiation codons present in genetic code? Give three termination codons in protein synthesis.
26. (a) Mention the polarity of continuous and discontinuous strands.
(b) Which enzyme joined discontinuously synthesized fragment in replication.
(c) In which phase of cell division replication of takes place. What is its significance?

27.Mendle cross homozygous tall with homozygous dwarf and proposed two general rules to consolidate his understanding of inheritance explains two rules on monohybrid cross.
OR
Night blindness and colour blindness usually seen in human males? Can human female also develop this disorder? Explain it

SECTION-D :
28. (A) what is the number of chromosomes in the following cells of a human male?
(a) Sertoli cells (b) Spermatogonial cells.
(B) Mention the function of leydig cells.
(C) Draw diagrams of T.S of testis and explain the process of spermatogenesis.
OR
(A) Why are date palm plant referred to as dioceous?
(B) Name an organism in which isogamy occurs.
(C) Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?
(D) Why both tapeworm and earthworm is hermaphrodite’s animal?

29. (A) Name the chemical extracted from Cannabis sativa.
(B) What is the function of opioids give one example of opioids?
(C) Barbiturates, LSD used on which types illnesses.
(D) Which drug is used as effective sedative and painkiller and is very useful in patients who have undergone surgery.
OR
(A) Name the plant from which Cocaine is obtained.
(B) What is Withdrawal syndrome?
(C) Mention the function of Nicotine. Name the plant in which nicotine present.
(D) Name the drugs, which is used by sport person to increase muscle power.

30. (A) Write down the seven pair of contrasting character selected by Mendel in pea.
(B) Why Mendel selected pisum sativum for his experiment?
(C) What happens when a red-colored homozygous 4 O’ clock plant is crossed with a heterozygous 4 O’ clock plant? Work out all the genotype and phenotypes.
OR
(A) Name the positively charged proteins in nucleoid.
(B) Who proposed the double helix model of DNA?
(C) How many nucleotides present in bacteriophage lambda.
(D) Explain the structure of double- helix model of DNA.