12th Biology and Computer Science Quarterly Exam Question Paper 2019

 Bio-Botany:-

1) A plant "X" possesses a small flower with a reduced perianth and versatile anther. The probable agent for the pollination would be 

1. water
2. Air
3. Butterflies
4. Beetles

2) "Gametes are never hybrid", This is a statement of a

1. Law of dominance
2. Law of independent assortment
3. Law of segregation 
4. Law of random fertilization

3) Match The Following.

1. Syngenesions
2. Androecium
3. male gametophyte 
4. primary parietal layer

4) Match The Following.

1. Exonuclease
2. Endonuclease 
3. Alkaline Phosphatase
4. Ligase

5) Which of the following sentence are correct?

1. The offspring exhibit only parental combinations due to that incomplete linkage.
2. The liked gene exhibit some crossing over in complete linkage.
3. The separation of the two linked genes is the possible incomplete linkage
4. Crossing over is absent in complete linkage.

6) Which of the following statement is correct?

1. unavailable
2. Callus undergoes differentiation and produces somatic embryoids
3. Surface sterilization of explants 
4. PH of the culture medium is 5.0 to 6.0 

7) Solidifying agent used in plant tissue culture is 

1. Nicotine acid 
2. Cobaltous chloride 
3. EDTA
4. Agar

8) Which of the following soil water is available for plants?

1. Gravitational water 
2. Chemically bound water 
3. Capillary water
4. Hygroscopic water

9) What is micropropagation?

10) What do you know about pleiotropy?

11) How will you identify asymmetric cuts?

12) What are evergreen forests?

13) How can we protect the cells or tissues from the stress of freezing temperature in the cryopreservation technique?

14) Write any four ecologically important days.

15) Draw and label the T.S of the mature anther.

16) Explain the types of crossing over.

17) What are the new materials used to grow microorganisms like spirulina?

18) What is thermal stratification? Mention their types.

19) What are the two or three parts of a patent? List out the general steps in step patenting.

20) Bring out the inheritance of the chloroplast gene with an example. (OR)

      Explain the steps by steps involved in recombinant  DNA Technology with a diagram.

21) Explain the basic concepts involved in the plant tissue culture

1. Green algae are not strata of the ocean:-
2. What is vivipary? the name was a plant group which exhibits vivipary.

Bio-Zoology:-

1) In which type of parthenogenesis the only males produced?

1. Arrhenotoky
2. Thelytoky
3. amphiboly
4. Both a and c

2) Which of the is not belong to the accessory glands of the male reproductive system?

1. Bulbourethral gland
2. Cowper's gland 
3. Bartholin's gland 
4. prostate gland

3) Assertion (A):-LNG 20 is often called a hormone-releasing intrauterine system (US)

Reason (R):-They increase the viscosity of the cervical mucus and three preventing sperms from entering the cervix

1. (A) is true,(R) is false
2. Both (A) and(B) are true
3. (A) is false,(R) is true
4. Both (A) and (R) are true

4) Meselson and Stahl's experiment proved

1. Transduction
2. Transformation 
3. DNA is the genetic material 
4. semi-conservative nature of DNA replication

5) Sudden appearance of the vestigial organs in highly evolved organisms is called.

1. Vestigial organs
2. connecting link
3. atavistic organs
4. adaptive radiation

6) Which of the following treatments is not correct?

1. The Bursa of Fabricius is a primary lymphoid organ of the birds
2. B lymphocytes mature in the bursa
3. Bursa of Fabricius brings cell-mediated immunity 
4. Bursa of Fabricius brings humeral immunity 

7) The gases produced in anaerobic sludge digesters are

1. Menthane, oxygen and hydrogen sulphide
2. Hydrogen sulphide, methane and sulphur dioxide
3. Hydrogen sulphide, methane and nitrogen 
4. Methane, hydrogen sulphide CO2

8) Match the following and choose the correct answer from the options given below.

1. Mutualism 
2. Commensalism 
3. Parasitism 
4. Competition 
5. Predation

9) What is known as paedogamy?

10) Differentiate foeticide and infanticide.

11) Write the symptoms of patau's syndrome.

12) Mention any two objections to Darwinism.

13)  What is zymology?
14) What are stenotherms?

15) What is parthenogenesis? give two examples from animals.

16) What is amniocentesis? Why a statutory ban was imposed on this technique?

17) State the name of an immunosuppressant used in organ transplantation produced from Trichoderma polysporum and write its uses.

18) Give the salient feature of mutation theory.

19) Define ecological niche.

20) Give a schematic representation of spermatogenesis and oogenesis in humans (OR)

     What is colour Blindness? How X- linked gene inherited in the marriage between hemizygous recessive male and normal visioned women.

21) Why did Hershey and chase use radioactively labelled phosphorus and sulphur only? would they have gotten the same result if they used radio-labelled carbon and nitrogen? (OR)

      Describe the structure of immunoglobulin with a suitable diagram.

12th Biology Quarterly Exam Question Paper Tamil Medium Click Here To Download 👇

                                                                                

12th Biology Quarterly Exam Question Paper English Medium Click Here To Download 👇

                                                                               

12th Botany Quarterly Exam Question Paper Tamil Medium Click Here To Download 👇

                                                                               

12th Zoology Quarterly Exam Question Paper Tamil Medium Click Here To Download 👇

                                                                               

Computer Science:-

12th Computer Science Quarterly Exam Question Paper Tamil Medium Click Here To Download 👇 

           

                                                                                   

12th Computer Science Quarterly Exam Question Paper English Medium Click Here To Download 👇

                                                                                   

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