Kerala Plus Two Question Paper 2024 Biology

Kerala Board

Question Paper
2024

Reg. No. : ......................................
SY-526 Name : ...........................................

SECOND YEAR HIGHER SECONDARY EXAMINATION, MARCH – 2024

Part – III Time : 2 Hours
BIOLOGY Cool-off time : 15 Minutes
(Botany & Zoology) Preparatory Time : 10 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 ‘10 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  ‘  ’ .
     
‘10  ’   .  
  ,   
 .
 ‘  ’    
 .
      .
    .
  , , ,   
.
   .
    .
     
    .
SY-526 1

PART – A

BOTANY

(Maximum : 30 Scores) Time : 1 Hour

I. Answer any 3 questions from 1 – 4. Each carries 1 score. (3  1 = 3)

1. Choose the correct answer and fill up the blanks :

In grasses the monocot embryo contains single cotyledons named _______.

(Plumule, Radicle, Scutellum, Coleorhiza)

2. In Recombinant DNA technology, precipitated DNA can be separated by _______.

3. A single stranded DNA or RNA tagged with radioactive molecule is called ______.

(a) Plasmid

(b) Probe

(c) Clone

(d) Vector

4. Sun is the only source of energy for all ecosystem on earth. But one exception. What is

that ?

SY-526 2

PART – A

BOTANY

(Maximum : 30 Scores) Time : 1 Hour

I. 1  4    3  .
1  . (3  1 = 3)

1.      .

       

_______.

(, , , )

2.  ...    DNA 

  _______.

3.  DNA  RNA  _________  

  .

(a)  (b) 

(c)  (d) 

4.         

  .     ?

SY-526 3 P.T.O.

II. Answer any 9 questions from 5 – 15. Each carries 2 scores. (9  2 = 18)

5. Observe the diagram of Pollen grain given below and answer the questions.

(a) Identify the cell ‘A’ and ‘B’.

(b) Write the two features of ‘A’.

6. Name the special cellular thickening present in the synergid at micropylar end. Write its

function.

7. What are the two core techniques that enabled the birth of modern biotechnology ?

8. Explain any two methods by which recombinant DNA can be directly introduced into

the host cell.

9. The first transgenic cow produced human protein enriched milk. Name the cow and the

protein found in milk.

SY-526 4

II. 5  15    9  .

2  . (9  2 = 18)

5.      
  .

(a)  ‘A’  ‘B’  .

(b) ‘A’    .

6.       
  ?   .

7.          ?

8.   ...     
   .

9.       
   ?      ?

SY-526 5 P.T.O.

10. Match the following :
A B
1. Biopiracy A. ADA deficiency
2. Gene Therapy B. Basmathi Rice
3. RNA Interference C. Cry gene
4. Bacillus thuringiensis D. Melodegynae incognita

11. The following graph shows two types of population growth curves.

(1) Name the growth curve ‘a’ & ‘b’.
(2) What does ‘K’ stands for ?

12. Parasites evolved special adaptations to live on host. What are they ?

13.

The figure depicts pyramid of energy.
(a) Pyramid of energy is always upright, can never be inverted. Justify
(b) Which are the other two ecological pyramids ?
SY-526 6

10.   .
A B
1.  A. ADA 
2.   B.  
3. RNA  C. Cry 
4.   D.  

11.       .

(1)   ‘a’  ‘b’  .
(2)    ‘K’     ?

12.       
.    ?

13.

     . 
    .
(a)      
   .  .
(b)      ?

SY-526 7 P.T.O.

14. A list of different organism in an ecosystem are given below. Arrange them in 1st, 2nd
3rd and 4th trophic level.

(Phytoplankton, Man, Fish, Zooplankton)

15. Rate of Biomass production in an ecosystem is called productivity. Productivity are
divided into two, GPP and NPP.

(a) Expand GPP & NPP.

(b) Write the equation relating GPP with NPP.

III. Answer any 3 questions from 16 to 19. Each carries 3 scores. (3  3 = 9)

16.

Observe the diagram and answer the following questions :

(1) Label ‘a’, ‘b’, ‘c’ and ‘d’.

(2) Name the diploid cell found in embryo sac.

17. The genes of organism can be altered by Manipulation. Such organisms are called
Genetically Modified Organism (GMO). List any 3 merits of G.M. Plants.

SY-526 8

14.       
    .  
 ,   ,   ,
    .
( , , ,  )

15.     
  .   
. GPP  NPP .
(a) GPP  NPP   .

(b) NPP  GPP    .

III. 16  19    3  .
3  . (3  3 = 9)

16.

(1)   ‘a’, ‘b’, ‘c’, ‘d’   .
(2)       ?

17.      
  (GMO)  .   
 3  .

SY-526 9 P.T.O.

18. Observe the figure given below :

(1) Fill in the blanks a, b, & c in the figure.

(2) Write the name of this process.

(3) What is the name of thermostable DNA polymerase enzyme used in this
techniques ?

19. Given below are examples of some population interactions. Identify and define the
interaction.

(a) Cattle egret and grazing cattle

(b) Fig tree and wasp

(c) Cuscuta growing on hedge plants.

SY-526 10

18.      
.

(1)  a, b, c  .

(2)    .

(3)      
.

19.      
 .     
  .

(a)   .

(b)  

(c)   
SY-526 11 P.T.O.

PART – B

ZOOLOGY

(Maximum : 30 Scores) Time : 1 Hour

I. Answer any three questions from 1 to 5. Each carries 1 score. (3  1 = 3)

1. Genes which code for a pair of contrasting traits are known as ______.

2. The process of copying genetic information from one strand of the DNA into RNA.

3. Name an oral contraceptive for females developed by scientists at Central Drug

Research Institute.

4. The enlarged end of penis called the glans penis is covered by a loose fold of skin

called _______.

5. Biodiversity is the term popularized by the sociobiologist _____ to describe the

combined diversity at all the levels of biological organization.

II. Answer any 9 questions from 6 to 16. Each carries 2 scores. (9  2 = 18)

6. Differentiate between analogous organs and homologous organs and mention one

example each.

SY-526 12

PART – B

ZOOLOGY

(Maximum : 30 Scores) Time : 1 Hour

I. 1  5    3  .

1  . (3  1 = 3)

1.     
    __________.

2.     (DNA)       (RNA)
  

3.       
    .

4.    (glans-penis)  ,
  ___________.

5.      
 ‘’   
   __________ .

II. 6  16    9  .

2  . (9  2 = 18)

6.   (analogous organs),   (homologous organs)
      .

SY-526 13 P.T.O.

7. Observe the given diagram of male reproductive system, and identify the parts labelled
as A, B, C and D.

8. Infections or diseases which are transmitted through sexual intercourse are collectively
called sexually transmitted infections.

(a) Name any two STIs. (1)

(b) Suggest any two methods to prevent STIs. (1)

9. Complete the following table :

Chromosomal Disorder Karyotype Symptoms

_____
A Trisomy 21 Palm is broad, Short statued

_____
B _____
C Gynaecomastia

Turner’s Syndrome 44 + Xo _____
D

10. Innate immunity is non-specific type of defence, that is present at the time of birth.

Which are the four types of barriers involved in innate immunity and mention one
examples for each.

SY-526 14

7.      , A, B, C, D
    .

8.      
   .

(a)   STI   . (1)

(b) STI     . (1)

9.   :

Chromosomal Disorder Karyotype Symptoms

_____
A Trisomy 21 Palm is broad, Short statued

_____
B _____
C Gynaecomastia

Turners Syndrome 44 + Xo _____
D

10.       
    .

      ,
   .

SY-526 15 P.T.O.

11. Complete the following flow chart which shows the origin and evolution of man.

12. A wide range of contraceptive methods are presently available.

(a) Name two surgical methods advised for male and female partner as a terminal
method to prevent any more pregnancies. (1)

(b) Give two examples for copper releasing IUDs. (1)

13. In a cross between true breeding red-flowered (RR) and true breeding white-flowered
(rr) plants, the F1 (Rr) was pink coloured.

(a) Name the inheritance pattern mentioned here. (½)

(b) F1 was self-pollinated and F2 was obtained. What is the genotypic ratio and

phenotypic ratio of F2. (1)

(c) Mention a plant which shows this inheritance. (½)

14. The following diagram shows central dogma in molecular biology. Write the name of
process represented as A and B.

SY-526 16

11.      
.

12.      .

(a)       
     . (1)

(b)   IUD  (copper releasing IUDs)  . (1)

13.    (RR)     (rr)
    F1   
 (Rr) .

(a)     . (½)

(b) F1    F2 . F2   ,
   ? (1)

(c)      . (½)

14.       . A, B
    .

SY-526 17 P.T.O.

15. Match the following :

A B

Clostridium butylicum Acetic acid

Aspergillus niger Lactic acid

Acetobacter aceti Butyric acid

Lactobacillus Citric acid

16. In a debate conducted in school, your friend said that AIDS can be transmitted through
touch or physical contact.

(a) Do you agree with that statement ? (½)

(b) Name the clinical test used to diagnose AIDS. (½)

(c) How do HIV infect human body ? (1)

III. Answer any three questions from 17 to 20. Each carries 3 scores. (3  3 = 9)

17. Observe the diagrammatic presentation of various events during a menstrual cycle.

(a) Identify ‘A’ and ‘B’ in graph. (1)

SY-526 18

15.   .

A B

Clostridium butylicum Acetic acid

Aspergillus niger Lactic acid

Acetobacter aceti Butyric acid

Lactobacillus Citric acid

16.   , AIDS  
     .

(a)     ? (½)

(b) AIDS     

 (½)

(c) HIV    . (1)

III. 17  20    3  .
3  . (3  3 = 9)
17.      .

(a)  ‘A’, ‘B’   . (1)

SY-526 19 P.T.O.

(b) Identify the structure ‘C’ and write its function. (1½)

(c) Which pituitary hormone is secreted in its maximum level during the time of
ovulation ? (½)

18. What are the six steps involved in DNA finger-printing ?

19. Biodiversity and its conservation are now vital environmental issues of international
concern as more and more people around the world begin to realise the critical
importance of biodiversity for our survival and well being on this planet.

(a) Which are the four major causes of biodiversity losses ? (1)

(b) Name two different methods of biodiversity conservation. (1)

(c) What is so special about tropics that might account for their greater biological
diversity ? (1)

20. Pedigree analysis of two Mendelian disorders are shown below :

(a) Identify the trait represented as A and B. (1)

SY-526 20

(b)  ‘C’    . (1½)

(c)    
   ? (½)

18.    (DNA)      
  ?

19.      
     
    
    .

(a)      ? (1)

(b)      
. (1)

(c)      
  ? (1)

20.       
.

(a) A, B    (trait) . (1)

SY-526 21 P.T.O.

(b) Which is the symbol for consanguineous mating used in pedigree analysis ? (1)

(c) What do you mean by pedigree analysis ? (1)

___________

SY-526 22

(b)     

  . (1)

(c)       ? (1)

___________

SY-526 23 P.T.O.

SY-526 24

QUESTION PAPERS
GET PREVIOUS YEAR QUESTION PAPERS FOR ALL CLASSES FOR CBSE, ISCSE, ISC AND ALL ALL
STATE BOARDS HERE AT

Andhra Pradesh Board Question Papers
BOARD
WISE Assam Board Question Papers
Bihar Board Question Papers
Chhattisgarh Board Question Papers
Goa Board Question Papers
Gujarat Board Question Papers
Haryana Board Question Papers
Himachal Pradesh Board Question Papers
J&K State Board Question Papers
Jharkhand Board Question Papers
Karnataka Board Question Papers
Kerala Board Question Papers
Madhya Pradesh Board Question Papers
Maharashtra State Board Question Papers
Manipur Board Question Papers
Meghalaya Board Question Papers
Mizoram Board Question Papers
Nagaland Board Question Papers
Orissa Board Question Papers
Punjab Board Question Papers
Rajasthan Board Question Papers
Tamil Nadu Board Question Papers
Telangana State Board Question Papers
Tripura Board Question Papers
Uttarakhand Board Question Papers
Uttar Pradesh (UP) Board Question Papers
West Bengal (WB) Board Question Papers