Kerala Plus One Question Paper 2024 Biology

Kerala Board

Question Paper
2024

Reg. No. : ......................................
FY-426 Name : ...........................................

FIRST 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 ’   .
 ‘  ’    
 .
      .
    .
  , , ,   
.
   .
    .
     
    .

FY-426 1 P.T.O.

PART – A
BOTANY
(Maximum : 30 Scores) Time : 1 Hour

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

1. Fill in the blank :
The dark reaction of photosynthesis takes place at ________ of the chloroplast.

2. Choose the correct answer :
Monocot seed consists of one large and shield shaped cotylidon known as ________.
(a) Aleurone layer (b) Scutellum
(c) Coleoptile (d) Coleorhiza

3. Which class of algae is commonly known as Brown algae ?

4. Which of these cell organelles is not covered by a membrane ?
(a) Golgi bodies (b) Endoplasmic reticulum
(c) Ribosomes (d) Vacuoles

II. Answer any 9 questions from 5 to 15. Each carries 2 scores. (9  2 = 18)
5. (a) Write the name of the phase of Prophase-I of Meiosis in which crossing over
takes place. 1
(b) What is the significance of crossing over ? 1

6. Match the following : (½ × 4)
Class of Fungi Example
(a) Phycomycetes (i) Agaricus
(b) Ascomycetes (ii) Alternaria
(c) Basidiomycetes (iii) Rhizopus
(d) Deuteromycetes (iv) Penicillium

7. (a) What is Glycolysis ? 1
(b) Where does it takes place ? 1

8. (a) Write one function of Abscisic acid. 1
(b) Why Abscisic acid is known as ‘Stress hormone’ ? 1

FY-426 2

PART – A
BOTANY
(Maximum : 30 Scores) Time : 1 Hour
I. 1  4    3  .
1  . (3  1 = 3)
1.    .
       ________ 
.

2.   .
        
  ________  .
(a)   (b) 
(c)  (d) 

3.        ?

4.     
(a)   (b) 
(c)  (d) 

II. 5  15    9  .
2  . (9  2 = 18)
5. (a)  -I     
. 1
(b)     ? 1

6.   . (½ × 4)
  
(a)  (i) 
(b)  (ii) 
(c)  (iii) 
(d)  (iv) 

7. (a)    ? 1
(b)    ? 1

8. (a)     . 1
(b)      
 ? 1

FY-426 3 P.T.O.

9. Write two differences between the anatomy of Stem and Root.

10. Observe the pathway of Anaerobic respiration given below :

(a) Label the compounds marked as A & B. 1
(b) What happens to pyruvic acid in muscles if oxygen is inadequate ? 1

11. (a) Write the function of stomata. 1
(b) What is the difference between the shape of Guard cells of Dicot plants and
Monocot plants (Grasses) ? 1

12. Arrange the given functions of plant hormones in appropriate columns : (½ × 4)
(a) Ripening of fruit
(b) Initiate rooting in stem cutting
(c) Induce parthenocarpy
(d) Breaks seed and bud dormancy
Auxins Ethylene

13. Write brief notes about
(a) Thermoacidophiles 1
(b) Halophiles 1

14. (a) Which plants are known as naked seeded plants ? 1
(b) Why ? 1

15. Cell cycle consists of four phases – G1, S, G2 and M.
Write one important event takes place during each phase. (½ × 4)
FY-426 4

9.       .
10.       .

(a) A, B    . 1
(b)       
    ? 1
11. (a)   . 1
(b)       
   . 1
12.     
. (½ × 4)
(a)  
(b)     .
(c)  .
(d) ,    .
 

13.     
(a)   1
(b)  1
14. (a)       ? 1
(b)  ? 1
15.    .  G1, S, G2, M . 
     . (½ × 4)
FY-426 5 P.T.O.

III. Answer any 3 questions from 16 to 19. Each carries 3 scores. (3  3 = 9)
16. Leucoplasts are classified into three types based on the stored food.
(a) Which are they ? 1½
(b) Write the name of stored food present in them. 1½

17. (a) What is aestivation ? 2
(b) Write the name of aestivation marked as A, B, C and D in the given diagram. 1

18. (a) Which are the two types of cells that participates in C4 pathway ? (Hatch and
Slack pathway) 1
(b) What is the name of the first C4 acid formed in this pathway ? 1
(c) Write two examples of C4 plants. 1

19. Observe the figure of Citric acid cycle.
(a) Where does it takes place in a cell ? 1
(b) Write the name of compounds marked as A, B, C and D in the figure. 2

FY-426 6

III. 16  19    3  .
3  . (3  3 = 9)
16.       
.
(a)   ? 1½
(b)    . 1½
17. (a)    ? 2
(b)   A, B, C, D  
 . 1

18. (a) C4  (   )    
 ? 1
(b)     C4   ? 1
(c) C4    . 1
19.      .
(a)     ? 1
(b)  A, B, C, D   
. 2

FY-426 7 P.T.O.

PART – B
ZOOLOGY
(Maximum : 30 Scores) Time : 1 Hour
I. Answer any 3 questions from 1 to 5. Each carries 1 score. (3  1 = 3)
1. The system of providing scientific name with two components is called __________.

2. Water vascular system is present in __________.
(a) Leech (b) Neries
(c) Prawn (d) Starfish

3. Name the nucleotide form of guanine.

4. The functional unit of a muscle contraction is called _________.

5. Erythro poietin, a peptide hormone produced by __________.

II. Answer any 9 questions from 6 to 16. Each carries 2 scores. (9  2 = 18)
6. Classify the following into polypeptides and polysaccharides :
(Trypsin, Inulin, Insulin, Chitin)

7. Observe the diagram of male reproductive system of Frog.
Label a, b, c, d (½  4)

FY-426 8

PART – B
ZOOLOGY
(Maximum : 30 Scores) Time : 1 Hour
I. 1  5    3  .
1  . (3  1 = 3)
1.       __________.

2.     __________.
(a) Leech (b) Neries
(c) Prawn (d) Starfish

3.   .

4.     _________  .

5.       __________.

II. 6  16    9  .
2  . (9  2 = 18)
6.   polypeptides, polysaccharides   
.
(Trypsin, Inulin, Insulin, Chitin)

7.   –
   .
a, b, c, d  . (½  4)

FY-426 9 P.T.O.

8. Give reason :

(a) AB blood group individuals are called universal recipients. 1

(b) SAN is called pacemaker of heart. 1

9. When substrate concentration increases, the velocity of enzymatic reaction rises at first.
After attaining maximum velocity, it is not exceeded by any further rise in
concentration of the substrate. Why ?

10. Distinguish between :

(a) Systole and Diastole 1

(b) Plasma and Serum 1

11. Indicate whether the following statements are true or false :

(a) Reptiles are ammonotelic animals.

(b) Lungs and liver also help in the elimination of excretory wastes.

(c) Inflammation of glomeruli of kidney is called renal calculi.

(d) Malpighian Tubules are the excretory structures of most of the insects including
cockroaches. (½  4)

12. Henle’s loop plays an important role in concentrating the urine. How ?

13. Name the joint :

(a) The joint between adjacent vertebrae

(b) Joint between skull bones

(c) Joint between atlas and axis

(d) Joint between carpal and metacarpal of thumb (½  4)

FY-426 10

8.  .
(a) AB    . 1

(b) SAN     . 1

9.     
  .    
   
  .  ?

10.   :

(a) Systole and Diastole 1
(b) ,  1

11.      .

(a) Reptiles are ammonotelic animals.
(b) Lungs and liver also help in the elimination of excretory wastes.
(c) Inflammation of glomeruli of kidney is called renal calculi.
(d) Malpighian Tubules are the excretory structures of most of the insects including
cockroaches. (½  4)

12.     .  ?

13.  .

(a) The joint between adjacent vertebrae
(b) Joint between skull bones
(c) Joint between atlas and axis
(d) Joint between carpal and metacarpal of thumb (½  4)

FY-426 11 P.T.O.

14. Which hormonal deficiency is responsible for the following ?
(a) Diabetes insipidus (b) Cretinism

(c) Diabetes mellitus (d) Dwarfism (½  4)

15. Give one word :
(a) Warm blooded animals
(b) The body surface is distinctly marked out into segments
(c) The property of a living organism to emit light

(d) Sexes are not separate (½  4)

16. Match the following :
(a) Radula – Sycon
(b) Pinnae – Hydra
(c) Osculum – Equus
(d) Hypostome – Loligo (½  4)

III. Answer any 3 questions from 17 to 20. Each carries 3 scores. (3  3 = 9)
17. Observe the diagram. Answer the following :

(a) Identify the symmetry. 1
(b) State any two phylum in which this condition can be seen. 2

FY-426 12

14.     .

(a) Diabetes insipidus (b) Cretinism
(c) Diabetes mellitus (d) Dwarfism (½  4)

15.  .

(a) Warm blooded animals
(b) The body surface is distinctly marked out into segments
(c) The property of a living organism to emit light
(d) Sexes are not separate (½  4)

16.    :

(a) Radula – Sycon
(b) Pinnae – Hydra
(c) Osculum – Equus
(d) Hypostome – Loligo (½  4)

III. 17  20    3  .
3  . (3  3 = 9)

17.  . .

(a)   . 1

(b)      . 2

FY-426 13 P.T.O.

18. “The functioning of the kidneys is effectively monitored and regulated by hormonal
feedback mechanism involving the hypothalamus, JGA and to a certain extent heart.”
Explain the role of JGA in the regulation of kidney function.

19. Observe the diagram. Answer the question.

Label
(a)
(b)
(c)
(d) (½  4)
(e) Name different types of synapses. (1)

20. Define :
(a) Tidal volume (1)
(b) Residual volume (1)
(c) Vital capacity (1)
____________

FY-426 14

18. , JGA,       
    
 ,  .  
  JGA  ?

19.   .

Label
(a)
(b)
(c)
(d) (½  4)
(e)     ? (1)

20.  :
(a) Tidal volume (1)
(b) Residual volume (1)
(c) Vital capacity (1)
______________

FY-426 15 P.T.O.

FY-426 16