AUTUMN BREAK HOLIDAYS HOMEWORK CLASS XII ENGLISH (CORE) 1. Revise all chapters from ‘Flamingo’ and ‘Vistas’ that have been done. Prepare all possible questions from them (short answer and long answer). 2. Attempt any 02 question paper within the time slot of 3 hrs+ 15 min (80 marks) on the pattern of selection test. OR Practice all 05 types of formal letters Letter to editor Letter of placing order/cancellation Letter of enquiry Letter of complaint Job application 3. Practice short composition (02 for each category) notice/ poster/ advertisement. NOTE: Use a separate folder. HINDI
Transcript
AUTUMN BREAK HOLIDAYS HOMEWORK
CLASS XII
ENGLISH (CORE)1. Revise all chapters from ‘Flamingo’ and ‘Vistas’ that have been done. Prepare all possible questions
from them (short answer and long answer).2. Attempt any 02 question paper within the time slot of 3 hrs+ 15 min (80 marks) on the pattern of
selection test.OR
Practice all 05 types of formal letters Letter to editor Letter of placing order/cancellation Letter of enquiry Letter of complaint Job application
3. Practice short composition (02 for each category) notice/ poster/ advertisement.
NOTE: Use a separate folder.
HINDI
ACCOUNTANCY1 Prepare a project work regarding comprehensive problem
2 Prepare following numerical problems chapter wise
S.N. Chapter Question Numbers of excercise1 Admission of a Partner 45,59,66,71,75,76,85,87A,88B,1232 Retirement and death 37,45,48,49,56,59,71,73,78,793 Dissolution of a partnership
firm3,11,13,22,26A,29,37,38,39,42,
4 Fundamentals 19,23,27,40,49,53,56,71,5 Change in profit ratio 14,19,23,28.31B,35,41,
BUSINESS STUDIES1. Revise unit 1 to unit 11 (for first pre-board and monthly test).
2. Practice latest 3 sample paper from cbse.nic.in based on new pattern (also paste it on your notebook).
3. Prepare a project on any 1 topic from the following topics. Scientific principles of management. General principles of management. Marketing management. Stock market. Business environment.
4. Follow up of selection test.
Note* = Do the holiday homework in homework side.
Physics
Solve EXERCISE QUESTIONS of EMI and ac
1. 6.3 ,6.4 ,6.8 , 6.11 2. alternating current 7.1 17.2 27.3 37.6 7.4 7.7 7.9 7.113. Em waves
8.3 ,8.4, 8.5 ,8.6., 8.10 ,8.15
4. Ray optics and optical instruments9.1 ,9.2 ,9.7, 9.8 ,9.13
5. Wave optics
10.1, 10.4 ,10.7 ,10.8
Solve QUESTIONS PAPER OF SELECTION TEST.
Chemistry 1. Solve the question paper of selection test in your homework note book 2. Complete investigatory project and submit the file3. Complete practical record
GEOGRAPHY
1. Prepare practical record file of all chapters. The record file should be written neat and clean handwriting as the same is to be submitted in CBSE exam.
2. Locate and label the followings in the map of world .All features items must be identified by you
i) Major air ports of the world.
ii) Major sea ports of the world
iii) HQ of regional trade blocks
iv) Mega cities of the world
v) All type of maps of primary activities of chapter 5 of the book of human geography.
vi) All countries having, highest and lowest HDI, sex ratio, population growth rate etc..
3. In the map of India locate and label the following
i) States leading producers of different crops.
ii) Software technological parks.
iii) HQ of railway zone of India.
iv) Sea ports and international air ports.
v) Oil refineries.
vi) Metropolitan cities.
vii) States having highest sex ratio, HDI, density of population.
4. Take out the print out of model Question Papers from CBSE web site and prepare and learn all Ques. /Ans. Of chapters taught till date.
HISTORY1. Revision of all chapters (Chapter 1-12)2. Map skill: In notebook based on chapters
3. Prepare CBSE Project/Practical on assigned topic (Topics are already assigned to students)
4. Prepare 10-10 MCQs from each lesson .
POLITICAL SCIENCE
INFOMRATICS PRACTICES Prepare a softcopy of PRACTICAL FILE containing following programs:
1. Write a NumPy program to create a 3x3 matrix with values ranging from 2 to 10.2. Write a NumPy program to create a one dimensional array with 8 equal spaced values
between 4 and 5.3. Write a program to create a 3X4 matrix having all values as zeros.4. Write a program to create a 3X4 matrix having all values as one.5. Write a Pandas program to compare the elements of the two Pandas Series??
6. Write a Python program to convert a dictionary to a Pandas series. Sample Series: Dictionary:{'a': 100, 'b': 200, 'c': 300, 'd': 400, 'e': 800}Converted series: a
100b 200c 300
d 400e 800
dtype: int647. Create the following series:
Neha 100Sohan 90Jiya 89Riya 23Tiya 56
8. Write a menu deriven program to add, subtract, multiple and divide two Pandas Series.9. Write a program to sort the element of Series S1 into S2.10. Write a NumPy program to reverse an array Ar.
11. Write a NumPy program to create a 8x8 matrix and fill it with checkerboard pattern.
12. Write a NumPy program to append values to the end of an array. Expected Output: Original array: [10, 20, 30]After append values to the end of the array: [10 20 30 40 50 60 70 80 90]
13. Write a menu deriven program to add, subtract, multiple and divide two 3X3 numpy arrays.14. Write a panda program to read marks detail of Manasvi and Calculate sum of all marks.
15. Write a Pandas program to sort the data frame first by 'Designation' in Ascending order, then by 'Name' in Descending order.data1 = {'Name':['Akshat', 'Sameer', 'Pihu', 'Neha'] , 'Age':[28,34,29,42], 'Designation':['Accountant' , 'Clerk', 'Clerk', 'Manager']}
16. The table shows passenger car fuel rates in miles per gallon for several years. Make a LINE GRAPH of the data. During which 2-year period did the fuel rate decrease? YEAR: 2000 2002 2004 2006 RATE: 21.0 20.7 21.2 21.6
17. The number of bed-sheets manufactured by a factory during five consecutive weeks is given below.
Week First Second Third Fourth Fifth
Number of Bed-sheets 600 850 700 300 900
Draw the bar graph representing the above data
18.
The number of students in 7 different classes is given below. Represent this data on the bar graph.
Class 6th 7th 8th 9th 10th 11th 12th
Number of Students 130 120 135 130 150 80 75
19.
The number of students in 7 different classes is given below. Represent this data onthe bar graph.
Class 6th 7th 8th 9th 10th 11th 12th
Number of Students 130 120 135 130 150 80 75
20. The Production(in Tone) by Factory in Years is shown below Represent this data on the scatter graph.
Year 2000 2005 2010 2015Production in Tons 50 40 30 60
21. Assume following data is stored in data frame named as df1
Name Sales Quarter StateRSahay 125600 1 DelhiGeorge 235600 1 Tamil NaiduJayaPriya 213400 1 KeralaManilaSahai 189000 1 HaryanaRymaSen 456000 1 West BengalManilaSahai 172000 2 HaryanaJayaPriya 201400 2 Kerala
Create the above dataframe and write the statement for the following:
Find total sales per state(ii) find total sales per employee(iii)find total sales both employee wise and state wise(iv)find mean, median and min sale state wise(v)find maximum sale by individual(vi) Write a command to sort data according to ‘Name’ and then by ‘Sales’ and store it in another dataframe. (vii ) Write command to group the data frame according to their ‘Name’ and store it in ‘gdf’(viii) Write command to show groups created in gdf.22. Given two arrays namely arr1 and arr2 each having 5 values. Create a scatter chart so
that each data points gets a different color, different size. Keep the marker style as square.
23. Consider the table given below and write the query for the followingTable: CLUB
1. To display the name of all games with their Gcodes.2. To display details of those games which are having Fees more than 7000.3. To display the content of the CLUB table in descending order of startDate.
4. To delete the record of all GameNames.5. List the minimum and maximum fees from CLUB.
24 Consider the tables FLIGHTS & FARES. Write SQL commands for the statements
i) Display flight number & number of flights from Mumbai from the table flights.ii) Arrange the contents of the table flights in the descending order of destination.iii) Increase the tax by 2% for the flights starting from Delhi.iv) Display the flight number and fare to be paid for the flights from Mumbai to Kochi using the tables, Flights & Fares, where the fare to be paid =fare+fare*tax/100.v) Display total no of source stations(eliminate duplicate) present in the table.vi) Display the fare for the flight for MUMBAI to BANGLORE vii)Display the records of source stations started with letter ‘B’.viii) Display the flight no. for which fare to be paid is less than 3000.ix) Display total no. of flights available for each Airlinesx) Add a new column Dep_Time in the table Flight.xi)Delete the record of flight no. IC301 from the table FARE.xii) increase the size of the column ‘source’ to 30 in the Table FLIGHT
25. Write a command to create the below given table:
Table: Department
Column name Dno Dname DlocDatatype Integer Varchar CharSize 30 50Constraint Primary key Not null
Table: Employee
Column name Empno Name Gender City Salary DnoDatatype Integer Varchar Char Varchar NUMBER IntegerSize 50 1 30 5,2Constraint Primary
Empno Name Gender City Salary Dno101 Naina F Delhi 70000 10102 Sohan M Ggn 50000 20103 Mohan M Ggn 25000 30104 Reena F Delhi 30000 10105 Teena F Ggn 35000 10
Write the following query with output
i. Write a query to display the data of department table.ii. Write a query to display the data of employee table.iii. Write query to display name, gender and salary of all employee in ascending order of
their salary.iv. Write a query to display the list of departments which are located in GGNv. Write a query to display name of all the employee who are living in Gurgaonvi. Write a query to display the details of employee whose empno is 105vii. Write a query to display all male employees living in delhiviii. Write a query to display the details of employees of department no 10 in descending
order of their names.ix. Write a query to display name and salary of all the employee whose salary lies between
30 thousand to 50 thousand.x. Write a query to display the records of all the employee who are either female or
working in department no 30xi. Write a query to display the detail of all the employee, the last second character of
whose name is a.xii. Write a query to delete all the records who are living in Gurgaon.xiii. Write a query to increase the salary of all the employees by 15% of their existing salary.xiv. Write a query to change the city to rohtak of employee whose employee no is 104xv. Write a query to delete the records of all the employees of department no 10xvi. Write a query to add one more column i.e dob date notnull.xvii. Write a query to display to display name, dno,salary and their corresponding
department of all the employees.xviii. Write a query to display name and dname of all the employees of city Gurgaon.
26 Prepare a Project (topic of your choice) based on the connectivity of Python and MYSQL.
ECONOMICS1. Solve Selection Test Paper 2. Solve CBSE sample paper for the session 2019- 203. Revise the whole syllabus covered
MATHEMATICSSELECTION TEST 2019-20
TIME-3 HRS MAX MARKS-80General Instructions:
1. All the questions are compulsory.2. This paper contains 36 questions.3. Question 1-20 in Section A are very short-answer type questions carrying 1 mark
each.4. Question 21-26 in Section B are short-answer type questions carrying 2 marks
each.5. Question 27-32 in Section C are long-answer-I type questions carrying 4 marks
each.6. Question 33-36 in Section D are long-answer-II type questions carrying 6 marks
each.7. Please write down the serial number of the question before attempting it .
2.If f: R → R be given by f(x) = (3−x3 )13 ,the fof(x) is
(a) x13 (b) x3 (c) x (d) 3-x3
3.Let f:R → R be defined by f(x) = x2 +1 .Then the pre image of 17 an d -3 respectively are (a) ϕ {4,-4} (b) {3,-3}, ϕ (c) {4,-4}, ϕ (d) {4,-4}, {2,-2}
4. sin[π3 - sin-1(
12) ] is equal to
(a) 12 (b)
13 (c)
14 (d) 1
5. The domain of sin-1 2x is
(a) [0,1] (b) [-1,1] (c) [−12 ,
12 ] (d) [-2,2]
6.If sin-1(13 ) + cos-1 x =
π2 then find x.
7,The order of all possible matrices of of order 3 × 3 with each entry o or 1 is(a) 27 (b) 18 (c) 81 (d) 512
8.If A = [cosα −sinαsinα −cosα ] ,then find the value ofα for which A is identity matrix ?.
9.. If the matrix A = [0 a −32 0 −1b 1 0 ] is skew matrix ,find the value of a and b.
10.If A is an invertible matrix of order 2 ,then det(A-1) is equal to
(a) det(A) (b) 1
det ( A) (c) 1 (d) 0
11. Find the value of x if | x 218 x| = | 6 2
18 6| .
12.Let A be a square matrix of order 3 ×3 .write the value of |3 A| ,where |A| = 4.13.The function f(x ) = [x] where [x] denotes greatest integer function , is continuous at(a) 4 (b) -2 (c) 1 (d) 1.514 Find a point on the parabola y = (x-3)2 where the tangent is parallel to the chord joining the points (3,0) and (4,1).
15.If x= t2 and y = t3 ,then find the value of d2y/dx2 .16. The abscissa of the point on the curve 3y = 6x – 5x3 ,the normal at which passes through the origin is
(a) 1 (b) 13 (c) 2 (d)
12
17.If (x) = 3x2+15x +5,the find the approximate value of f(3.02).18. Show that the function f(x) = 4x3 – 18 x2 -27x -7 is always increasing in R
19.If ddx (f(x)) = 4x3 -
3x4 such that f(2) = 0 .Then f(x) is:
(a) x4 +1x3 -
1298 (b) x3 +
1x4 +
1298 (c) x4 +
1x3 +
1298 (d) x3 +
1x4 -
1298
20.Evaluate ∫ dxsin2 xcos2 x
.
Section B
21.Evaluate ∫ dx1+tanx
22.The side of an equilateral triangle is increasing at the rate of 2cm/s.At what rate is its area increasing when the side of an equilateral triangle is 20 cm.
23.Find the value ofdydx at θ=π
4 ,if x = aeθ( sinθ – cosθ) and y = aeθ( sinθ + cosθ)
OR
If x= a(2θ - sin2θ), y = a( 1- cos2 θ), find dydx at θ=π
3
24. For what value of x, [ 1 2 1 ][1 2 02 0 11 0 2 ][02x ]=0.
OR
By using the elementary operation find the inverse of matrix A = [1 32 7]
25. Prove that tan−1 211
+tan−1 724
=tan−1 12
26.Let Z be set of all integers and R be the relation on z defined as R= {(a,b): a,b∈Z∧a−b is divisible by 5 }. Prove that R is equivalence relation. SECTION C
27. Solve the equation tan-1 2x + tan-1 3x =
π4
OR
Write in the simplest form tan−1[ a cos x−b sin x
b cos x+a sin x ]
28. . Find when OR
Differentiate with respect to x.29.Prove that the curves x = y2 and xy = k cut at right angles if 8k2 = 1.
30.Prove that |a+b+2 c a bc b+c+2 a bc a c+a+2a| = 2 (a+b+c )3 .
Or
If x,y,z are different and |x x2 1+x3
y y2 1+ y3
z z2 1+z3| = 0 ,show that
(i) 1+xyz = 0(ii) xyz = -1
31. Integrate ∫ ex( x2+1(x+1)2 ¿dx’
32.Find the value of p and q such that function f(x) = { 1−sin3 x3 cos2 x
,if x< π2
pq(1−sinx)(π−2 x)2 if x>
π2
, if x=π2
Is continuous at x = π2 .
Section D
33. Evaluate
OR
Evaluate
34.An open box with a square base is to be made out of a given quantity of
cardboard of area c2 . Show that the maximum volume of the box is
OR
Prove that the volume of the largest cone that can be inscribed in a sphere of
radius R is 8/27 of the volume of sphere.
35. Find
A−1where A = [1 2 −32 3 23 −3 −4] hence solve the system of equation
x+2 y−3 z=−4 ;2 x+3 y+2 z=2 ;3 x−3 y−4 z=11.36. Consider f : R → [−5 , ∞) given by f(x) = 9x2+ 6x -5 show that f is invertible with
f−1 ( y )=√ y+6−13
.
BIOLOGY
Q. P. 1Unit First: Reproduction MM: 35, Time: 90 mnts
General Instructions: 1. There are a total of 15 questions and five sections in the question
paper. All questions are compulsory. 2. Section A contains question number 1 to 4, Very Short Answer type
questions of one mark each. 3. Section B contains question number 5 to 8, Short Answer type I
questions of two marks each. 4. Section C contains question number 9 to 14, Short Answer type II
questions of three marks each. 5. Section D contains question number 15, Long Answer type
questions of five mark.6. There is no overall choice in the question paper, however, an
internal choice is provided in one question of three marks and of five mark. An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number.
Section-A
1. If the chromosome number of plant species is 28, what would be the chromosome number and ploidy of its endosperm cell.
2. Mention the importance of LH surge during menstrual cycle. At what day of menstrual cycle LH surge occurs?
3. LNG-20 is used as contraceptive. Justify.4. Why are plant produced by asexual reproduction are called as clone?
Section-B5. Give asexual reproducing structures of Penicillium, sponge, water
hyacinth, and Bryophyllum..6. When and how does placenta develop in human female? How is placenta connected to the
embryo?7. What techniques are adopted if fertilisation is not possible in the female?
Describe each of them.8. A pollen grain consists of two cells. Name them. Also write the functions of
each.Section-C
9. A microsporangium consists of four layers. Name the innermost layer along with its two characteristics. What is its function?
ORDescribe the process of embryo sac formation from megaspore mother cell. Also draw a well labelled structure of embryo sac.
10. Study the graph given below and answer the questions that follow:
a) Name the hormone X and Yb) Identify the ovarian phase during menstrual cycle.
i) 5th to 12th day of the cycle ii)14th day and iii) 16th to 25thday of the cycle.
c) Explain the ovarian events (i), (ii) and (iii) under the influence of hormone X and Y.
11. What is oogenesis? When does it start? Draw a schematic diagram ofit showing chromosome number at each stage.
12. What is inbreeding depression? What devices are devised by plants for cross pollination? Name any four.
13. Draw a well labelled diagram of anatropous ovule and label the following parts in it :-(i) That develops in to seed coat
(ii) That develops in to embryo sac(iii)Through which the pollen tube gains entry in to embryo sac(iv)That attaches the ovule to the placenta
14. A researcher attempts making apomicts of hybrid seeds.(a) What are the advantages of this attempt?(b) How does it occur naturally in mango?(c) How do you think this experiment will help the farmer?
Section-D
15. (a) Draw a schematic labelled diagram of a fertilised embryo sac of an Angiosperm.
(b) Describe the stages in embryo development in a dicot plant.OR
Q.P. 2CLASS -XII
General Instructions1. There are a total of 15 questions and five sections in the
question paper. All questions are compulsory.
(a) Compare the fate of sperms shown in the diagram.(b) What is the role of zonapellucida in this process?(c) Analyze the changes occurring in the ovum during the process.(d) Mention what helps in the entry of sperms in to the ovum.(e) Specify the region of female reproductive system where the event represented in the diagram takes place.
2. Section A contains question number 1 to 4, Very Short Answer type questions of onemark each.
3. Section B contains question number 5 to 8, Short Answer type I questions of two marks each.
4. Section C contains question number 9 to 14, Short Answer type II questions of three marks each.
5. Section D contains question number 15, Long Answer type questions of five mark.
6. There is no overall choice in the question paper, however, an internal choice is provided in one question of three marks and of five mark. An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number.
All the questions are compulsory.SECTION-A (1X4=4)
1. Your younger sister has seen a banana tree in the backyard of a house. She could see the fruit but no seed. She wants to know how a new plant of banana will be produced without seed. What will you explain to your sister?
2. What is biological magnification? Give one example.3. BOD of two sample of water-A and B were 80 mg/ litre and 200 mg/
litre respectively. Which sample is more polluted?4. A male honey bee has 16 chromosomes whereas its female has 32
chromosomes. Give one reason.SECTION –B (2X4=8)
5. Write the function of the following.a) Myometrium b) Sertoli cells
6. Name the interaction in each of the following-
(a) Cuckoo lays her eggs in the crow’s nest.(b) Orchid grows on a mango tree.(c) Ticks live on the skin of dog(d) Mycorrhizae living on the roots of higher plants..
7. Mention the polarity of the DNA strands a-b and c-d shown in the replication forkgiven below.
8. i) Differentiate between the unambiguous and degenerate nature of the Genetic code.ii) Write down the machinery required for the replication of DNA.
SECTION –C (3X6=18)9. Study the population growth curve in the graph given below and
answer the questions which follow;-
(a) Identify the growth curves ‘a’ and ‘b’(b) Which one of them is considered more realistic one and why?(c) If dN/dt= rN (k-N/K) is the equation of the logistic growth curve, what does k stands for?
10.Ornithologist observed decline in the bird population in an area near a lake after the setting of an industrial unit in the same area? Explain the cause responsible for the decline observe.
11.What is Spermatogenesis? Briefly describe the process of Spermatogenesis with the help of diagram/flow chart.
12.
a) Name the molecule “X” synthesised by “i” gene. How does this molecule get inactivated?b) Which one of the structural genes codes for β-galactosidases?c) When will the transcription of this gene will stop?13.A woman with blood group O married a man with AB group. Show
the possible blood groups of the progeny. List the alleles involved in the inheritance.
14.Figure given below is of Darwinian Finches.
i) Mention the specific geographical area where these were found?ii) Name and explain the phenomenon that has resulted in the evolution of such diverse species in the region.iii) How did Darwin visit the particular geographical area?
ORState Hardy-weinberg Principle? Write and explain the equation of Hardy-Weinberg Equilibrium. Name the factors which disturb this equilibrium. When there is disturbance in hardy-Weinberg equilibrium, what would it result in?
SECTION-D (1X5=5)
15.a) If you had ever been to any high altitude place (>3500 m Rohtang Pass near Manali and Mansarovar, in China occupied Tibet) you must have experienced what is called altitude sickness.(i) What are the symptoms of altitude sickness?(ii) Why does altitude sickness occur?(iii) How does your body solve this problem?(b) Very small animals are rarely found in Polar Regions. Give reason.
ORAnswer the following questions:i. “Alien species are highly invasive and a threat to species diversity.”
Substantiate this statement with one example each from plants and animals. ii. List two criteria to determine a hotspot of biodiversity.
iii. Name two hotspots of biodiversity in India.
.Q.P. 3
Class-XIIUNIT-II(GENETICS AND EVOLUTION)
MM: 35, Time: 90 mntsGeneral Instructions:
1. There are a total of 15 questions and five sections in the question paper. All questions are compulsory.
2. Section A contains question number 1 to 4, Very Short Answer type questions of one mark each.
3. Section B contains question number 5 to 8, Short Answer type I questions of two marks each.
4. Section C contains question number 9 to 14, Short Answer type II questions of three marks each.
5. Section D contains question number 15, Long Answer type questions of five mark.
6. There is no overall choice in the question paper, however, an internal choice is provided in one question of three marks and of five mark. An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number.
SECTION-A (1X4=4)
Q1.How many base pairs of DNA are wrapped around histone octamer?
Q2. A diploid organism heterozygous for 4 loci .How many types of gametes are produced?
Q3.Write down two chemical differences between DNA and RNA?
Q4.Name the chromosome has most number of genes and least number of genes?
SECTION-B (2x4=8)
Q5.Name the two organic molecules which were synthesized during Stanley and Miller experiment?
Q6. What is adaptive radiation.Explain with an example?
Q7 .Draw a well labeled diagram of a transcription unit?Which strand of DNA will be transcribed as mRNA?
Q8. A child develops from an XX egg fertilized by a Y carrying sperm. Name the disorder .Give the characteristic features of the individual?
SECTION-C(3x6=18)
Q9.In a population the frequency of an individuals with hiomozygousdominat(AA) combination is 16% ,and that of homozygous recessive(aa) combination is 36%. Calculate the allele frequency for the recessive allele(a) in the given population and also calculate the percentage of individuals with heterozygous(Aa) combinations.
Q10. In case of Snapdragon, a plant with red flowers was crossed with white flowers; trace the inheritance of colour of flower upto F2 generation indicating the genotype of each level. What special feature do you note in the genotypic and the phenotypic ratios at this level?
Q 11. a) A couple who is unable to bear a child, on clinical examination revealed that the wife was unable to produce a normal egg. How would you advice them to help children?
b)Amniocentesis for sex determination is banned in our country. Is this ban necessary? Comment.
Q12.What is the cause of discontinuous synthesis of DNA on one of the parental strands of DNA? What happens to these short stretches of the DNA synthesized?
OR
What is Hardy-Weinberg’s principle ? Mention the factors affecting Hardy-Weinberg principle?
Q13.A) How do intra uterine devices prevent conception? List any two ways.
b) Write down the chemical composition of oral pills?
Q14. What is natural selection? Explain with respect to Industrial Melanism?
Section-D (5x1=5)
Q15.Explain how Hershey and Chase experimentally proved that DNA is the genetic material?
OR
a) Define central dogma?b) Mention the levels where gene expression can be regulated?c) Explain gene expression regulation in Lac operon?
