Kerala Plus One Question Paper 2023 Biology

FIRST YEAR

Kerala Board
Question Paper
2023

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

FIRST YEAR HIGHER SECONDARY EXAMINATION, MARCH 2023
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 ’   .
 ‘  ’    
 .
      .
    .
  , , ,   
.
   .
    .
     
    .

1 P.T.O.

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

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

1. Fill in the blank :

The algal component in lichen is known as ________.

2. Choose the correct answer :

The R.Q. (Respiratory Quotient) of carbohydrate is ________.

(0.9, 1, 0, 0.7)

3. Observe the relationship of first pair and fill in the blank :

algin : Brown algae

Carrageen : ________

4. Name the type of vascular bundle in the figure :

5. Fill in the blank :

The site of dark reaction in photosynthesis is ________ part of chloroplast.

FY-426 2

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

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

1  . (3  1 = 3)

1.   :

   ________ .

2.    :

   ________ .
(0.9, 1, 0, 0.7)

3.      :

 :  

 : ________

4.    .

5.   :

      ________
.

FY-426 3 P.T.O.

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

6. Expand the following :

(A) PPLO

(B) SER

7. Observe the diagram given below :

(i) Identify this bryophyte.

(ii) Label the parts A, B and C.

8. Match the following :

A B

Amoeboid Protozoans Paramoecium

Flagellated Protozoans Entamoeba

Ciliated Protozoans Plasmodium

Sporozoans Trypanosoma

FY-426 4

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

2  . (9  2 = 18)

6.   :

(A) PPLO

(B) SER

7.    :

(i)    .

(ii) A, B, C   .

8.   :

A B
  

  

  

 

FY-426 5 P.T.O.

9. Fill in the blanks with appropriate terms given below :
Chloroplast, Amyloplasts, Lencoplast, Aleuroplast

10. Karyokinesis in Mitosis involves four stages. What are they ?

11. The following figures A & B show two different types of phyllotaxy :
(i) Define phyllotaxy.
(ii) Write the name of phylloxy A & B.

12. Write any two uses of Ethephon.

13. The first step in respiration is glycolysis.
(A) Define glycolysis.
(B) Write the site of glycolysis in a cell.
(C) Enzyme responsible for conversion of glucose to glucose-6-phosphate.

FY-426 6

9.       :
, , , 

10.     .  .

11.       :
(i)  .
(ii) A, B   .

12.     .

13.    .
(A)  .
(B)     ?.
(C) , -6-   
 ?
FY-426 7 P.T.O.

14. Certain physiological effects in plants are given below :

Name the plant growth regulators responsible for it.

(A) Bolting

(B) Apical dominance

(C) Ripening of fruit

(D) Closure of stomata

15. Identify the sub stages of prophase I of Meiosis in which the following events takes
place :

(A) Crossing over

(B) Pairing of homologous chromosome

(C) Terminalisation of Chiasmata

(D) Dissolution of synaptonemal complex

16. Some characteristic features of C3 and C4 plants are given below :

 Kranz anatomy absent

 Lack photorespiration

 First product of CO2 fixation is PGA.

 Primary CO2 acceptor is PEP.

Arrange them as follows :

C3 Plants C4 Plants

 

 

FY-426 8

14.      . 
    :

(A) 

(B)  

(C)  

(D)  

15.     I  
   .

(A)  

(B)   

(C)   .

(D)   .

16. C3, C4      :

    

   

      PGA.

  CO2  PEP.

      :

C3 Plants C4 Plants

 

 

FY-426 9 P.T.O.

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

17. The given figure shows different types of flowers based on position of floral parts on
thalamus :

(i) Identify (A) & (B).

(ii) Explain Epigynous flower.

18. Write any 3 external and internal features that affect photosynthesis.

19. The following are the anatomical features of flowering plants. Arrange these features in
the table given below :

 Spongy parenchyma

 Hypodermis present

 Exarch Xylem

 Conjoint and open vascular bundle

 Large empty bulliform cells

 Endodermis with Casparian strip

Root Stem Leaf

  

  

FY-426 10

III. 17  20    3  .
3  . (3  3 = 9)
17.      
   :
(i) A, B  .

(ii)    .

18.    ,   3 
.

19.     
.      
 :
  
  
  
     
    
    .
  
  

  

FY-426 11 P.T.O.

20. Observe the figure given below and answer the following questions.

(i) Write the name of this cycle.

(ii) Identify A & B in the cycle.

FY-426 12

20.      .

(i)   .

(ii)  A, B   .

FY-426 13 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. Name the enzyme that accelerate the following reaction :

CO2 + H2O H2CO3 HCO 3– + H+

2. The double walled membrane that protects the heart is ________.

3. Scientific name of lion is given below. Which one is correctly written ?

(a) Panthera leo

(b) pantheraleo

(c) Panthera Leo

(d) panthera Leo

4. The disorder in which stone or insoluble mass of crystallised salts formed within the
kidney.

5. Name the fluid filled space that separate the membranes of pre and post synaptic
neurons at a chemical synapse.

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

6. (a) Name the tissue that act as pacemaker in human heart.

(b) What is the significance of pacemaker in the functioning of heart ?

FY-426 14

PART – B

ZOOLOGY

(Maximum : 30 Scores) Time : 1 Hour

I. 1  5    3  .
1  . (3  1 = 3)
1.    
 :

CO2 + H2O H2CO3 HCO 3– + H+

2.     

3.    .   
 ?
(a) Panthera leo
(b) pantheraleo
(c) Panthera Leo
(d) panthera Leo

4.        
   ?

5.     
      
.

II. 6  16    9  .
2  . (9  2 = 18)
6. (a)       ?
(b)      ?

FY-426 15 P.T.O.

7. Certain hormones that regulate Kidney function are given in Column-A. Their specific
functions are given in the Column-B. Match them suitably.

A B

 ADH  Powerful Vaso Constrictor

 Angiotensin II  Water reabsorption

 ANF  Reabsorption of Na+

 Aldosterone  Cause dilation of blood vessels

8. The processes involved in muscle contraction are given below. Arrange them in correct
sequential order. (The first step is given correct)

 A signal sent out by CNS.

 Binding of Ca++ with troponin.

 Release of a neurotransmitter.

 Remove the masking of active sites for myosin.

 Release of Ca++ into Sarcoplasm.

9. Select Poiokilothermous animals from the list :

Corvus, Felis, Rana, Calotes, Scoliodon, Macaca, Hippocampus, Pavo.

10. General structure of amino acid is given :

Draw the structure of the amino acids, (a) glycine and (b) Serine.

11. (a) Write any two types of synovial joints.

(b) Identify its location.
FY-426 16

7.       -A 
   -B  . 
  .

A B
 ADH    

  II   

 ANF    

    

8.      
.   .
(   )
 A signal sent out by CNS.
 Binding of Ca++ with troponin
 Release of a neurotransmitter
 Remove the marking of active sites for myosin
 Release of Ca++ into Sarcoplasm.

9.       :
Corvus, Felis, Rana, Calotes, Scoliodon, Macaca, Hippocampus, Pavo

10.      :

(a)  (b)      .

11. (a)     .
(b)   .

FY-426 17 P.T.O.

12. Observe the illustration :

(a) Identify A & B and fill the blanks.

(b) What happens when the co-factor is removed from the enzyme ?

13. Observe the diagrammatic presentation of ECG.

(a) What is the expansion of ECG ?

(b) What do P and QRS complex indicate ?

14. Identify each phylum from the characteristics given :

(a) Comb plates are the locomotory organs.

(b) Show alternation of generation.

(c) Presence of Water Vascular System.

(d) Body consists of proboscis, collar and trunk.

FY-426 18

12.   :

(a) A  B   .

(b)         ?

13. ECG    .

(a) ECG   ?

(b) P, QRS    ?

14.      .

(a)     .

(b)   .

(c)   .

(d)  , ,    .

FY-426 19 P.T.O.

15. Observe the graph :

(a) What does the graph represent ?

(b) Write any three conditions in the alveoli that favour the formation of
oxyhaemoglobin.

16. Write any two differences between Osteichthyes and Chondrichthyes.

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

17. Distinguish between :

(a) Nucleosides and Nucleotides

(b) Primary metabolites and Secondary metabolites

(c) Ligases and Lyases

18. Explain any two groups of organisms based on Coelom. Give one example for each
group.

FY-426 20

15.   :

(a)     ?

(b)      
 .

16.     
.

III. 17  20    3  .

3  . (3  3 = 9)

17. .

(a)  

(b)      

(c)  

18.        
 .

FY-426 21 P.T.O.

19. Complete the illustration appropriately.

Name 3 layers of Cranial meninges that protects brain.

Outer layer (d) ________

Middle layer (e) ________

Inner layer (f) ________

20. (a) Name two types of cells in Islets of Langerhans.

(b) Write any one functions of each type of cell.

(c) Name the gland where Islets of Langerhans found.

_________

FY-426 22

19.    .

     3 
.

 (d) ________

 (e) ________

 (f) ________

20. (a)        ?

(b)      .

(c)       ?

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FY-426 23 P.T.O.

FY-426 24