Kerala Plus Two Question Paper 2022 Biology

Reg. No. : .....................................
Name : ..........................................
SY-26
SECOND YEAR HIGHER SECONDARY EXAMINATION, MARCH 2022

Part – III Time : 2 Hours
BIOLOGY Cool-off time : 15 Minutes
(Botany & Zoology) Preparatory Time : 5 Minutes
Maximum : 60 Scores
General Instructions to Candidates :
 There is a ‘Cool-off time’ of 15 minutes in addition to the writing time. Further there
is a ‘5 minutes’ ‘Preparatory Time’ at the end of the Botany Examination and before
the commencement of Zoology Examination.
 Use the ‘Cool-off time’ to get familiar with questions and to plan your answers.
 Read questions carefully before answering.
 Read the instructions carefully.
 Calculations, figures and graphs should be shown in the answer sheet itself.
 Malayalam version of the questions is also provided.
 Give equations wherever necessary.
 Electronic devices except non-programmable calculators are not allowed in the
Examination Hall.
 
    15  ‘  ’ .
      ‘5
’   .  
  ,   
 .
 ‘  ’    
 .
      .
    .
  , , ,   
.
   .
    .
     
    .

SY-26 1

PART – A

BOTANY

(Maximum : 30 Scores) Time : 1 Hour

PART – I

A. Answer any 3 questions from 1 to 4. Each carries 1 score. (3  1 = 3)

Choose the correct answer :

1. Innermost wall layer of Micro-sporangium is ________

(a) Middle layer (b) Epidermis

(c) Tapetum (d) Endothecium

2. Fill in the blank.

The first restriction endonuclease enzyme isolated is ________.

3. In polar seas, seals have a thick layer of fat. Name the fat layer seen below their skin.

4. Choose the correct answer :

The green plants in the ecosystem are the chief ________

(a) Decomposers (b) Consumers

(c) Producers (d) Herbivores

B. Answer all questions from 5 to 6. Each carries 1 score. (2  1 = 2)

5. Fill in the blank.

The time period from birth to the natural death of an organism is known as _______.

6. Expand ELISA.

SY-26 2

PART – A

BOTANY

(Maximum : 30 Scores) Time : 1 Hour

PART – I
A. 1  4    3  .
1  . (3  1 = 3)
    :
1.      ________
(a)   (b) 
(c)  (d) 

2.     :
     ?

3.      
  .     ?

4.     :
   ________ .
(a)  (b) 
(c)  (d) 

B. 5  6    . 1  .
(2  1 = 2)
5.    .
     
________.

6. ELISA   .
SY-26 3 P.T.O.

PART – II

A. Answer any two questions from 7 to 9. Each carries 2 scores. (2  2 = 4)

7. What are the four main objectives of Bio-fortification ?

8. Mention the functions of GEAC (Genetic Engineering Approval Committee).

9. Fill in the blanks with suitable terms :

Asexual Reproduction

Asexual Reproductive Structure Examples

Zoospores (a)

(b) Penicillium

(c) Hydra

Gemmules (d)

B. Answer any two questions from 10 to 13. Each carries 2 scores. (2  2 = 4)

10. Comment on Self-incompatibility.

11. Introduction of semi-dwarf varieties increased production of rice and wheat. Complete
the table with the names of any two semi-dwarf varieties of wheat and rice.

Rice Wheat

(1) __________ (1) __________

(2) __________ (2) __________

SY-26 4

PART – II

A. 7  9    2  .
2  . (2  2 = 4)

7.      ?

8. GEAC     ?

9.        :
 
  


 (a)

(b) 

(c) 

 (d)

B. 10  13    2  .
2  . (2  2 = 4)

10.     .

11.     
 .    
       :
 

(1) __________ (1) __________

(2) __________ (2) __________

SY-26 5 P.T.O.

12. Fill in the blanks :
Population Interactions
Species-A Species-B Name of Interaction
(a)
___________ (b)
___________ Competition

(c)
___________ — Predation

— 0 (d)
___________

13. Name the type of succession that occurs in wet area. What is the climax community in
that succession ?

PART – III

A. Answer any three questions from 14 to 17. Each carries 3 scores. (3  3 = 9)

14. Explain the method of genetically engineered human insulin production by ‘Eli Lilly’
in 1983.

15. List out some of the adaptations seen in desert plants.

16. What are the consequences of deforestation ?

17. The figure shows the pyramid of energy. Pyramid of energy is always upright. Why ?

SY-26 6

12.         :
 
- - 
()
___________ ()
___________ 
()
___________ — 
— 0 ()
___________

13.      
.     
  ?

PART – III
A. 14  17    3  .
3  . (3  3 = 9)
14. 1983  ‘ ’     
  .

15.      .

16.     ?

17.     . 
     ?

SY-26 7 P.T.O.

B. Answer the following question. Carries 3 scores. (1  3 = 3)

18. CNG is widely used in vehicles in Delhi.

(a) Expand CNG.

(b) What are the advantages of using CNG than Diesel ?

PART – IV

Answer any one question from 19 to 20. Carries 5 scores. (1  5 = 5)

19. Pollination is an important mechanism found in flowering plants.

(a) Define Pollination.

(b) Write short note on :

(1) Autogamy

(2) Geitonogamy

(3) Xenogamy

20. Restriction enzymes are widely used in Biotechnology.

(a) Name two kinds of restriction enzymes.

(b) Explain the naming procedure of restriction enzymes with one example.

SY-26 8

B.    . 3  (1  3 = 3)

18.   CNG   :

(a) CNG    

(b)   CNG    ?

PART – IV

19  20    1  .

5 . (1  5 = 5)

19.       :

(a)  

(b)   :

(1) 

(2) 

(3) 

20.    
 .

(a)      .

(b)     

.

SY-26 9 P.T.O.

PART – B
ZOOLOGY
(Maximum : 30 Scores) Time : 1 Hour

PART – I
A. Answer any three questions from 1 to 4. Each carries 1 score. (3  1 = 3)
1. Homologous organ : Divergent evolution :: Analogous organ : ________

2. Expand the term ZIFT.

3. Mitotic division of zygote results in the formation of blastomeres is called ________.

4. Name the enzyme that joins the DNA fragments in dis-continuous strand during
replication.

B. Answer all questions from 5 to 6. Each carries 1 score. (2  1 = 2)
5. The term ‘Biodiversity’ was popularised by the scientist ________.

6. The first antibiotic discovered was _______.

PART – II
A. Answer any two questions from 7 to 9. Each carries 2 scores. (2  2 = 4)
7. ‘Codon AUG is known as initiator codon.
(a) Name the amino acid coded by AUG.
(b) Write any two stop codons.

8. Write the functions of the following structures in human reproduction :
(a) Leydig cells
(b) Corpus luteum

SY-26 10

PART – B
ZOOLOGY
(Maximum : 30 Scores) Time : 1 Hour

PART – I
A. 1  4    3  .
1  . (3  1 = 3)
1.   :   ::   : _______

2. ZIFT    .

3.       ________
 .

4. ...  (Replication)   
    (enzyme)  .

B. 5  6    .   .
(2  1 = 2)
5. ‘Biodiversity’    ________  .

6.     _______ .

PART – II
A. 7  9    2  .
2  . (2  2 = 4)
7. AUG    .
(a) AUG      ?
(b)    (stop codons) .

8.  ,    
 :
(a)  
(b)  

SY-26 11 P.T.O.

9. Match the following :
(A) (B)
(i) Trichoderma polysporum (a) Citric acid
(ii) Monascus purpureus (b) Ethanol
(iii) Saccharomyces cerevisiae (c) Cyclosporin A
(iv) Aspergillus niger (d) Statin

B. Answer any two questions from 10 to 13. Each carries 2 scores. (2  2 = 4)
10. Choose the correct terms from the bracket to fill in the blanks and complete the table :
(Bigbang theory, Miller’s experiment, Lamarkism, Darwinism)
(A) (B)
(i) Natural selection (a) ____________
(ii) Chemical evolution (b) ____________
(iii) Origin of Universe (c) ____________
(iv) Use and Disuse of organs (d) ____________

11. Write any four ill-effects of Drug/Alcohol abuse.

12. (a) Name the cap-like structure present in sperm head.
(b) Write its function.

13. (a) Distinguish between Male heterogamety and Female heterogamety.
(b) Write one example for each.

PART – III
A. Answer any three questions from 14 to 17. Each carries 3 scores. (3  3 = 9)
14. “Allele frequencies in a population are stable and is constant from generation to
generation.”
(a) Name the principle.
(b) Mention any four factors those affect this principle.

15. “Sex of a child is determined by father.” Substantiate the statement.

SY-26 12

9.   :
(A) (B)
(i)   (a)  
(ii)   (b) 
(iii)   (c)  A
(iv)   (d) 

B. 10  13    2  .
2  . (2  2 = 4)
10.       :
(  ,  , , )
(A) (B)
(i)   (a) ____________
(ii)  (b) ____________
(iii)   (c) ____________
(iv)    (d) ____________

11. /    
 .

12. (a)     
.
(b)   .

13. (a)   (Male heterogamety)    
(Female heterogamety)   .
(b)    .

PART – III
A. 14  17    3  .
3  . (3  3 = 9)
14. “     
” :
(a)   
(b)       .

15. “   .”  
.
SY-26 13 P.T.O.

16. ‘Incidents of STDs are very high among the age group of 15-24 years.’
(a) What is STD ?
(b) Name any four STDs.

17. (a) Write four major causes of Biodiversity loss.
(b) Give one example for in-situ conservation and ex-situ conservation of
Biodiversity.

B. Answer the following question. Carries 3 scores. (1  3 = 3)
18. (a) Expand the term DNA. Who proposed double helical model of DNA ?
(b) List out the nitrogen bases in DNA.

PART – IV
Answer any one question from 19 to 20. Each carries 5 scores. (1  5 = 5)
19. (a) Expand the term AIDS. Mention the name of virus that causes AIDS.
(b) Name the widely used diagnostic test for AIDS.
(c) List out any four practices for the prevention of AIDS.

20. Schematic diagram of a transcription unit is given below :

(a) Identify the parts A and B.
(b) What is transcription ?
(c) Write the complementary DNA strand by observing the strand given below :
5'-ATGCATGCAT-3'

___________

SY-26 14

16. 15   24  STD  .
(a)  STD ?
(b)   STD   .

17. (a)      .
(b)   ( )   (-)
    .

B.    . 3 . (1  3 = 3)
18. (a) DNA    . DNA    
 ?
(b) DNA    .

PART – IV
19  20    1  .
5 . (1  5 = 5)
19. (a) AIDS    .  
.
(b) AIDS      
 ?
(c) AIDS      
.

20.        :

(a) A, B    .
(b)   (Transcription) ?
(c)   DNA    (Complementary
strand)  :
5'-ATGCATGCAT-3'

___________

SY-26 15 P.T.O.

SY-26 16