Biology

SECTION A

1. The process includes separation and purification of biosynthetic product of bioreactors, which are collectively referred to as ---------------- processing?
2. Why do we say that there is no natural death in single celled organism?
3. What do you mean by founder effect?
4. Find out the differences between pisciculture and aqua culture?
5. If you live in a town or city, do you know where the nearest landfill site is?
6. Do you know that the scientist of which institute developed Saheli –a contraceptive for the females? Name the institute
7. What do stepper slopes mean in this contest?

 

S = CA^z

 

Species                       

 richness

                                                            Log S= log C + Z logA

 

                                    Area

8. What would be the phenotype of that plant that had a genotype Tt?

SECTION B

9. Define a) Juvenile phase b) senescent phase
10. Expand – CFCs and JFM.
11. What do you mean by standing state?
12. GPP-R =NPP. IS this representation correct? If correct define it.
13. Why are the transgenic animals being produced? How can man benefit from such modifications?
14. Give examples to prove that microbes release gases during metabolism.
15. Fill in the blank boxes of given table.

Crop	Variety	Insect pest
	Pusa Gaurav	Aphids
Flat bean		Fruit borer

16. Identify the skeletal structure of given chemical molecule.

( Figure 8.9,page 159 of NCERT textbook class 12)

17. Do you know that lichens can be used as industrial pollution indicators? Why?
18. If the sequence of the coding strand in a transcription unit is written as follows:  5’ATGCATGCATGCATGCATGCATGC-3’ write alone the sequence of mRNA.

SECTION C

                         _{Transcription             Translation}

19. DNA  ---------------àmRNA------------------à protein    

      What is this and who proposed it?

20. Give three important reasons why Thomas Hunt Morgan selected Drosophila melanogaster, fruit fly, for his experiment?
21. Draw a neat clean and well-labeled diagram of human sperm.
22. What does it represent? Explain in brief.

 

23. Give account of energy flow in ecosystem.
24. Fill in the blank boxes with names of interaction and also define each with proper examples.

Species A	Species B	Interaction
+	+
-	-
+	-

25. Find out the role of microbes in the following and explain briefly a) single cell protein (SCP)  b) soil
26. Draw well labeled diagram of an antibody molecule.
27. Try to trace various components of human evolution (hint: brain size and function, skeletal structure and dietary preferences)

SECTION D

28. Write any five salient features of genetic code. OR Explain the following terms with example. A) co-dominance  b) Incomplete dominance.
29. Correct the following statements.

 A) Surgical method of contraception prevents gamete formation.

 b) All sexually transmitted diseases are completely curable.

C) Oral pills are very popular contraceptive among the rural women.

d) In E.T. technique, embryos are always transferred in to the uterus

e) Abortion could happen spontaneously only.

                              OR

   Draw schematic representation of the spermatogenesis and oogenesis

                                                                                                                                                 

30. With the help of proper examples you describe only about divergent and convergent evolution

                                    OR

     Explain about given representation

 

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

Paper Submitted by

Name: ANUP YADAV

Email: jnvbiology@gmail.com

Phone No.      01253281855

Guess Paper – 2011
Class – XII
 Subject - Biology (Theory)

Time allowed: 3 hours                                                                                                                                 Mm:70

Instructions .

1 Q- 1-8 CARRY 1 MARKS EACH
2 Q- 9-18 CARRY 2 MARKS EACH

3 Q 19-27 CARRY 3 MARKS EACH

4 Q-28-30 CARRY 5 MARKS EACH

5 Alwyas draw neat and labelled digram whetther asked or not 

6  Give answer according to marks in order to save time..

SECTION – A

1. HOW THE SENSTIVITY OF THE TECHNIQUE "DNA FINGERPRINTING" CAN BE INCREASED ? 1

2. WHY THE PYRAMID OF BIOMASS IN SEA IS GENRALLY INVERTED?1

3. NAME THE FOLLOWING

 A. IMMUNOGLOBIN ACTS AS MEDITATOR IN ALLERGIC RESPONSES

 B. BIOLOGICAL RESPONSE MODIFIER WHICH HELPS IN DESTROYING TUMOR H(1/2 + 1/2)

4. DO EUKARYOTIC CELS HAVE RESTRICTION ENDONUCLEASES?.JUSTIFY (1/2 +1/2)

5. NAME THE IMPROVED VARIETY OF RAPESEED MUSTARD THAT IS RESISTANT TO APHIDS. 1

6. STATE GAUSE'S COMPETITION EXCLUSION PRINCIPLE. 1

7. NAME ONE KEY CONCEPT OF DRAWINAIN THEORY OF EVOLUTION OTHER THAN NATURAL SELECTION. 1

8. WHAT ARE SOMACLONES?.1

            

                                                                              SECTION -B

9.GIVE THE SEQUENCES OF EVENTS IN"MULTIPLE OVULATION EMBRYO TRANSFER TECHNOLOGY PROGRAMME" FOR INCREASING THE    HERD SIZE IN CATTLE( 1/2 * 4 =2)

10. A. WHICH GROWTH MODEL IS CONSIDERED A MORE REALISTIC  AND WHY?(1/2 +1/2)

      B. NAME THE FOLLOWING

           1. SMALLER BARNACLES IS RESTRICTED BY SUPERIOR BARANACLE..............1/2

           2. WARBLERS LIVING ON SAME TREE CO-EXIST AND DO NOT COMPETE..........1/2

11 A. WHERE DOES REPLICATION OF EUKARYOTES TAKES PLACE IN CELL CYCLE WHAT WILL BE CONSEQUENCES IF THERE IS FAILURE

       OF CELL DIVISION AFETR DNA REPLICATION 1/2 + 1/2

    B. GIVE ANY ONE REASON WHY BOTH THE STRANDS ARE NOT COPIED DURING TRANSCRIPTION 1

12.  DEFINE TOTIPOTENCY . WRITE ANY TWO STEPS  IN BREEDING A NEW GENETIC VARIETY.1/2 +1/2

                                                                   OR

A. EXPAND MALT .1/2

B.  WHAT IS SIGNIFICANCE OF MALT.1/2

C. NAME THE DIAGNOSTIC TEST FOR AIDS.1/2

D. WHAT IS THE PRINCIPLE OF IMMUNISATION 1/2

13 A.EXPAND PAR 1/2

     B. NAME THE PIONEER SPECIES ORGANIMS ON BARE ROCK. IN WHICH ENVIORMENT DO THEY GROW IN REFRENCETO POLLUTION (1/2)

      C.WHAT IS ROLE OF CFC'C IN OZONE DEPLETION .1

14 A. NAME ANY TWO PARASITIC  SPECIES OF FRUIT WHICH CONTAIN LARGE NUMBER OF SEEDS.1

     B. HOW POLLEN GARINS CAN BE STORED  FOR YEARS. (1/2)

      C.  WHAY TAPETUM CELLS HAVE DENSE CYTOPLAMS(1/2)

15.HOW AND WY IS BACTERIUM THERMUS AQUATICUS EMPLOYED IN RECOMBIANT DNA TECNOLOGY.EXPLAIN.(2)

16 . CITE  CASE OF CO-EVOLUTION WITHE THE HELP OF AN EXAMPLE. (2)

17. A. DRAW WELL LABBELED DIGRAM OF IMMULOGLOBIN ( ANY TWO LABELLING) 1

      B. HOW IS CANCEROUS CELL DIFFERBT FROM NORMAL CELLS.1

18. A. WHY DISTANCE BETWEEN TWO POLYPEPTIE CHAINS  IN DNA REMAINS ALMOST  CONSTANT. 1

     B  REPRESENT CENTRAL DOGMA AND WHO PROPOSED IT.(1/2 +1/2)

                                                                            SECTION-C

19. STUDY THE FOLLOWING FLOW CHART.NAME  THE HORMONES INVOLVED AT EACH STAGE .EXPLAIN THEIR FUNCTIONS

      HYPOTHALMUS ------PITUITARY------TESTES-----SPERMS 3

20. A. DRAW STRUCTURE OF BACTERIOPHAGE WITH ATLEAST 2 LABELINGS.1

      B. WHAT ARE ACTIVATED SLUDGE. 1

       C. WHAT ARE BACULOVIRUSES . THEY ARE USED AS BIOLOGICAL AGENT IN THE GENUS....... (1/2 +1/2)

21. A.  NAME THE CASE  IN WHICH GENOTYPIC AND PHENOTYPIC RATIOS ARE  SAME .DEMOSTRATE THE CROSS ?.WRITE THE SCIENTIFIC NAME

       OF FLOWER .( 1/2 + 1 + 1/2)

      B.A DIPLOID ORGANISM  IS  HETEROZYGOUS FOR 4 LOCI , HOW MANY TYPES OF GAMETES CAN BE PRODUCED?. 1

22. IN WHAT REFRENCE FOLLOWING TERMS ARE USE.

      A. LUNGS OF PLANET 1

      B. THE EVIL QUARTET 1

      C. BIOPROSPECTING  1

23.A. WHY IT IS DIFFICULT TO PASS THROUGH CELL MEMBRANES?. HOW BACTERIAL CELL MADE ' COMPETENT' TO TAKE UP DNA(PLASMID).2

     B. EXPLAIN ANY OTHER METHOD BY WHICH AN ALIEN DNA CAN GAIN ENTRY INTO HOST CELL TO FORM RECOMBINANT DNA .1

24.EXPLAIN IN DETAILS

 A . SICKLE  CELL ANAEMIA  2

 B. KLINEFELTER'S SYNDROME 1

25.A. GIVE THE SCINETIFIC NAME OF PATHOGEN CAUSING MALIGNANT MALARIA IN HUMANS 1

    B NAME THE KIND OF CELLS THE HIV ATTACKS FIRST 1

     C. HOW DOES SPLEEN SERVES AS AN ORGAN OF IMMUNITY 1

26. A DRAW THE AGE PYRAMIDS FOR HUMAN POPULATION 1

      B . DEFINE CARRYING CAPACITY. 1

       C.  WHAT IS 'r' in the eaquation dn/dt=rn AND GIVE ITS SIGNIFICANCE..(1/2 +1/2).

27. A EXPAND UTR . AND GIVE ITS ROLE .1/2 + 1/2

      B. what is frameshift mutation alongwith example. 1

       c. how tailing and capping  is done 1

              

                                                                           SECTION –D

28. A. SHOW  DIGRAMATICALLY THE STAGES OF EMBRYONIC DEVELOPMENT FROM ZYGOTE UTO IMPLANTATION IN HUMANS.3

      B. GIVE THE SCHEMATIC REPRESNTATION OF OOGENESIS 2

                                      OR

A DRAW A  7-CELLED,8- NUCLEATE NATURE  OF FEMALE GAMETOPHYTE. 2

B. ZYGOTE IS DORMANT FOR SOMETIMES IN A FERTILISED OVULE . COMMENT 1

C. CAN CROSS POLLINATION OCCUR IN CLEISTOGAMOUS FLOWRES JUSTIFY 1

29 HOW IS BT. COTTON PLANT PRODUCED?.EXPLAIN MECHANISM BY WHIICH PLANT IS ABLE TO RESIST  THE INFESTATION BY COTTON

       BALLWORMS . 5

                                                       OR

NAME ANY TWO CLONING VECTORS. DESCRIBE THE FEATUIRES  REQUIRED TO FACILITATE CLONING INTO A VECTOR. 5

 30 .GIVE THE  EXPERIMENTAL PROOF GIVEN BY MESELSON AND STAHL .IF ECOLI ALLOWDED TO GROW FOR 80 MINUTES THEN WHAT WOULD

      BE THE PROPORTIONS OF LIGHT AND HYRID DENSITIES DNA MOLECULE?..5

                                             OR

  EXPLAIN THE SWITCHING 'ON' AND 'OFF' OF LCA OPERON . WHAT IS MEANT BY NEGATIVE REGULATION...5

                                                 BEST OF LUCK FOR YOUR BOARD EXAMS.......

1) for solution please refer latest  ncert book of biology class xii

2)for  any details or any confusion or problem in paper you may search me on facebook ..by writing  my email id on facebook serarch "girls.r.like.seasons@gmail.com" with name sharanjeet sing....

3) if u like the paper please comment and i will release new quetion paper  in january ..

 

Paper Submitted By:

Name : sharanjeet singh

Email:  girls.r.like.seasons@gmail.com