CBSE Board Paper 2024 (Marking Scheme and Solutions) | Biology Class 12 - NEET PDF Download

 Page 1


XII_ 044 57/1/1 BIOLOGY # pg. 1 
 
Marking Scheme 
Strictly Confidential 
(For Internal and Restricted use only) 
Senior Secondary School Certificate Examination,2024 
SUBJECT NAME BIOLOGY (Q.P. CODE 57/1/1) 
General Instructions: - 
1  You are aware that evaluation is the most important process in the actual and correct assessment of 
the candidates. A small mistake in evaluation may lead to serious problems which may affect the 
future of the candidates, education system and teaching profession. To avoid mistakes, it is 
requested that before starting evaluation, you must read and understand the spot evaluation 
guidelines carefully. 
2  “Evaluation policy is a confidential policy as it is related to the confidentiality of the 
examinations conducted, Evaluation done and several other aspects. Its’ leakage to public in 
any manner could lead to derailment of the examination system and affect the life and future 
of millions of candidates. Sharing this policy/document to anyone, publishing in any magazine 
and printing in News Paper/Website etc may invite action under various rules of the Board 
and IPC.” 
3  Evaluation is to be done as per instructions provided in the Marking Scheme. It should not be done 
according to one’s own interpretation or any other consideration. Marking Scheme should be 
strictly adhered to and religiously followed. However, while evaluating, answers which are based 
on latest information or knowledge and/or are innovative, they may be assessed for their 
correctness otherwise and due marks be awarded to them. In class-XII, while evaluating two 
competency-based questions, please try to understand given answer and even if reply is not 
from marking scheme but correct competency is enumerated by the candidate, due marks 
should be awarded.  
4  The Marking scheme carries only suggested value points for the answers 
These are in the nature of Guidelines only and do not constitute the complete answer. The students 
can have their own expression and if the expression is correct, the due marks should be awarded 
accordingly. 
5  The Head-Examiner must go through the first five answer books evaluated by each evaluator on the 
first day, to ensure that evaluation has been carried out as per the instructions given in the Marking 
Scheme. If there is any variation, the same should be zero after delibration and discussion. The 
remaining answer books meant for evaluation shall be given only after ensuring that there is no 
significant variation in the marking of individual evaluators. 
6  Evaluators will mark( v ) wherever answer is correct. For wrong answer CROSS ‘X” be marked. 
Evaluators will not put right ( ?)while evaluating which gives an impression that answer is correct 
and no marks are awarded. This is most common mistake which evaluators are committing. 
7  If a question has parts, please award marks on the right-hand side for each part. Marks awarded for 
different parts of the question should then be totaled up and written in the left-hand margin and 
encircled. This may be followed strictly. 
8  
If a question does not have any parts, marks must be awarded in the left-hand margin and encircled. 
This may also be followed strictly. 
9  If a student has attempted an extra question, answer of the question deserving more marks should 
Page 2


XII_ 044 57/1/1 BIOLOGY # pg. 1 
 
Marking Scheme 
Strictly Confidential 
(For Internal and Restricted use only) 
Senior Secondary School Certificate Examination,2024 
SUBJECT NAME BIOLOGY (Q.P. CODE 57/1/1) 
General Instructions: - 
1  You are aware that evaluation is the most important process in the actual and correct assessment of 
the candidates. A small mistake in evaluation may lead to serious problems which may affect the 
future of the candidates, education system and teaching profession. To avoid mistakes, it is 
requested that before starting evaluation, you must read and understand the spot evaluation 
guidelines carefully. 
2  “Evaluation policy is a confidential policy as it is related to the confidentiality of the 
examinations conducted, Evaluation done and several other aspects. Its’ leakage to public in 
any manner could lead to derailment of the examination system and affect the life and future 
of millions of candidates. Sharing this policy/document to anyone, publishing in any magazine 
and printing in News Paper/Website etc may invite action under various rules of the Board 
and IPC.” 
3  Evaluation is to be done as per instructions provided in the Marking Scheme. It should not be done 
according to one’s own interpretation or any other consideration. Marking Scheme should be 
strictly adhered to and religiously followed. However, while evaluating, answers which are based 
on latest information or knowledge and/or are innovative, they may be assessed for their 
correctness otherwise and due marks be awarded to them. In class-XII, while evaluating two 
competency-based questions, please try to understand given answer and even if reply is not 
from marking scheme but correct competency is enumerated by the candidate, due marks 
should be awarded.  
4  The Marking scheme carries only suggested value points for the answers 
These are in the nature of Guidelines only and do not constitute the complete answer. The students 
can have their own expression and if the expression is correct, the due marks should be awarded 
accordingly. 
5  The Head-Examiner must go through the first five answer books evaluated by each evaluator on the 
first day, to ensure that evaluation has been carried out as per the instructions given in the Marking 
Scheme. If there is any variation, the same should be zero after delibration and discussion. The 
remaining answer books meant for evaluation shall be given only after ensuring that there is no 
significant variation in the marking of individual evaluators. 
6  Evaluators will mark( v ) wherever answer is correct. For wrong answer CROSS ‘X” be marked. 
Evaluators will not put right ( ?)while evaluating which gives an impression that answer is correct 
and no marks are awarded. This is most common mistake which evaluators are committing. 
7  If a question has parts, please award marks on the right-hand side for each part. Marks awarded for 
different parts of the question should then be totaled up and written in the left-hand margin and 
encircled. This may be followed strictly. 
8  
If a question does not have any parts, marks must be awarded in the left-hand margin and encircled. 
This may also be followed strictly. 
9  If a student has attempted an extra question, answer of the question deserving more marks should 
XII_ 044 57/1/1 BIOLOGY # pg. 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
be retained and the other answer scored out with a note “Extra Question”. 
10  No marks to be deducted for the cumulative effect of an error. It should be penalized only once. 
11  A full scale of marks 70 has to be used. Please do not hesitate to award full marks if the answer 
deserves it. 
12  Every examiner has to necessarily do evaluation work for full working hours i.e., 8 hours every day 
and evaluate 20 answer books per day in main subjects and 25 answer books per day in other 
subjects (Details are given in Spot Guidelines).This is in view of the reduced syllabus and number 
of questions in question paper. 
13  Ensure that you do not make the following common types of errors committed by the Examiner in 
the past:- 
? Leaving answer or part thereof unassessed in an answer book. 
? Giving more marks for an answer than assigned to it. 
? Wrong totaling of marks awarded on an answer. 
? Wrong transfer of marks from the inside pages of the answer book to the title page. 
? Wrong question wise totaling on the title page. 
? Wrong totaling of marks of the two columns on the title page. 
? Wrong grand total. 
? Marks in words and figures not tallying/not same. 
? Wrong transfer of marks from the answer book to online award list. 
? Answers marked as correct, but marks not awarded. (Ensure that the right tick mark is 
correctly and clearly indicated. It should merely be a line. Same is with the X for incorrect 
answer.) 
? Half or a part of answer marked correct and the rest as wrong, but no marks awarded.  
14  While evaluating the answer books if the answer is found to be totally incorrect, it should be 
marked as cross (X) and awarded zero (0)Marks. 
15  Any unassessed portion, non-carrying over of marks to the title page, or totaling error detected by 
the candidate shall damage the prestige of all the personnel engaged in the evaluation work as also 
of the Board. Hence, in order to uphold the prestige of all concerned, it is again reiterated that the 
instructions be followed meticulously and judiciously. 
16  The Examiners should acquaint themselves with the guidelines given in the “Guidelines for Spot 
Evaluation” before starting the actual evaluation. 
17  Every Examiner shall also ensure that all the answers are evaluated, marks carried over to the title 
page, correctly totaled and written in figures and words. 
18  The candidates are entitled to obtain photocopy of the Answer Book on request on payment of the 
prescribed processing fee. All Examiners/Additional Head Examiners/Head Examiners are once 
again reminded that they must ensure that evaluation is carried out strictly as per value points for 
each answer as given in the Marking Scheme. 
Page 3


XII_ 044 57/1/1 BIOLOGY # pg. 1 
 
Marking Scheme 
Strictly Confidential 
(For Internal and Restricted use only) 
Senior Secondary School Certificate Examination,2024 
SUBJECT NAME BIOLOGY (Q.P. CODE 57/1/1) 
General Instructions: - 
1  You are aware that evaluation is the most important process in the actual and correct assessment of 
the candidates. A small mistake in evaluation may lead to serious problems which may affect the 
future of the candidates, education system and teaching profession. To avoid mistakes, it is 
requested that before starting evaluation, you must read and understand the spot evaluation 
guidelines carefully. 
2  “Evaluation policy is a confidential policy as it is related to the confidentiality of the 
examinations conducted, Evaluation done and several other aspects. Its’ leakage to public in 
any manner could lead to derailment of the examination system and affect the life and future 
of millions of candidates. Sharing this policy/document to anyone, publishing in any magazine 
and printing in News Paper/Website etc may invite action under various rules of the Board 
and IPC.” 
3  Evaluation is to be done as per instructions provided in the Marking Scheme. It should not be done 
according to one’s own interpretation or any other consideration. Marking Scheme should be 
strictly adhered to and religiously followed. However, while evaluating, answers which are based 
on latest information or knowledge and/or are innovative, they may be assessed for their 
correctness otherwise and due marks be awarded to them. In class-XII, while evaluating two 
competency-based questions, please try to understand given answer and even if reply is not 
from marking scheme but correct competency is enumerated by the candidate, due marks 
should be awarded.  
4  The Marking scheme carries only suggested value points for the answers 
These are in the nature of Guidelines only and do not constitute the complete answer. The students 
can have their own expression and if the expression is correct, the due marks should be awarded 
accordingly. 
5  The Head-Examiner must go through the first five answer books evaluated by each evaluator on the 
first day, to ensure that evaluation has been carried out as per the instructions given in the Marking 
Scheme. If there is any variation, the same should be zero after delibration and discussion. The 
remaining answer books meant for evaluation shall be given only after ensuring that there is no 
significant variation in the marking of individual evaluators. 
6  Evaluators will mark( v ) wherever answer is correct. For wrong answer CROSS ‘X” be marked. 
Evaluators will not put right ( ?)while evaluating which gives an impression that answer is correct 
and no marks are awarded. This is most common mistake which evaluators are committing. 
7  If a question has parts, please award marks on the right-hand side for each part. Marks awarded for 
different parts of the question should then be totaled up and written in the left-hand margin and 
encircled. This may be followed strictly. 
8  
If a question does not have any parts, marks must be awarded in the left-hand margin and encircled. 
This may also be followed strictly. 
9  If a student has attempted an extra question, answer of the question deserving more marks should 
XII_ 044 57/1/1 BIOLOGY # pg. 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
be retained and the other answer scored out with a note “Extra Question”. 
10  No marks to be deducted for the cumulative effect of an error. It should be penalized only once. 
11  A full scale of marks 70 has to be used. Please do not hesitate to award full marks if the answer 
deserves it. 
12  Every examiner has to necessarily do evaluation work for full working hours i.e., 8 hours every day 
and evaluate 20 answer books per day in main subjects and 25 answer books per day in other 
subjects (Details are given in Spot Guidelines).This is in view of the reduced syllabus and number 
of questions in question paper. 
13  Ensure that you do not make the following common types of errors committed by the Examiner in 
the past:- 
? Leaving answer or part thereof unassessed in an answer book. 
? Giving more marks for an answer than assigned to it. 
? Wrong totaling of marks awarded on an answer. 
? Wrong transfer of marks from the inside pages of the answer book to the title page. 
? Wrong question wise totaling on the title page. 
? Wrong totaling of marks of the two columns on the title page. 
? Wrong grand total. 
? Marks in words and figures not tallying/not same. 
? Wrong transfer of marks from the answer book to online award list. 
? Answers marked as correct, but marks not awarded. (Ensure that the right tick mark is 
correctly and clearly indicated. It should merely be a line. Same is with the X for incorrect 
answer.) 
? Half or a part of answer marked correct and the rest as wrong, but no marks awarded.  
14  While evaluating the answer books if the answer is found to be totally incorrect, it should be 
marked as cross (X) and awarded zero (0)Marks. 
15  Any unassessed portion, non-carrying over of marks to the title page, or totaling error detected by 
the candidate shall damage the prestige of all the personnel engaged in the evaluation work as also 
of the Board. Hence, in order to uphold the prestige of all concerned, it is again reiterated that the 
instructions be followed meticulously and judiciously. 
16  The Examiners should acquaint themselves with the guidelines given in the “Guidelines for Spot 
Evaluation” before starting the actual evaluation. 
17  Every Examiner shall also ensure that all the answers are evaluated, marks carried over to the title 
page, correctly totaled and written in figures and words. 
18  The candidates are entitled to obtain photocopy of the Answer Book on request on payment of the 
prescribed processing fee. All Examiners/Additional Head Examiners/Head Examiners are once 
again reminded that they must ensure that evaluation is carried out strictly as per value points for 
each answer as given in the Marking Scheme. 
XII_ 044 57/1/1 BIOLOGY # pg. 3 
 
MARKING SCHEME 
Senior Secondary School Examination, 2024 
BIOLOGY (Subject Code–044) 
[ Paper Code: 57/1/1] 
1 (C) / Maize 1 1 
2. (B) / Human Chorionic Gonadotropin   1 1 
3. (C) / Day 10 to 17 of menstrual cycle.  1 1 
4. (B) / 44 ? XXY– Overall feminine development   1 1 
5. (C) / 2 1 1 
6. (C) / N–glycosidic linkage 1 1 
7. (B) / Allergy 1 1 
8. (D) / Heterotrophic bacteria 1 1 
9. (D) /  Mice 1 1 
10. (A) / Six base pairs 1 1 
11. (D) / High vitamin – A content 1 1 
12. (C) / Secondary productivity and Net primary productivity 1 1 
13. (C) / Assertion (A) is true, but Reason (R) is false. 1 1 
14. (A) / Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation 
of Assertion (A). 
1 1 
15. (D) / Assertion (A) is false, but Reason (R) is true 1 1 
16. (C) / Assertion (A) is true, but reason (R) is false. 1 1 
 SECTION – B   
17. 
A – Wall of fruit / Wall of ripened ovary ,   
B – Scutellum,     
C – Radicle / Plumule / epicotyl / hypocotyl, 
D –Perisperm,  
 
 
 
 
½ x4 
 
 
 
 
 
2 
18 
Name of the Naturalist –Lamarck 
-Evolution of life forms driven by use and disuse of organs.  
 -He said Giraffes in an attempt to forage leaves on tall trees had to adapt by   
  elongation of their necks.  
-They passed on this acquired character of elongated neck to their succeeding generations  
and slowly over the years all the future generations had long necks.                                      
½ 
 
½ 
 
½ 
 
½ 
 
 
 
 
 
 
 
 
 
 
2 
19. 
• Ova from wife or female donor and sperm from husband or male donor are 
collected , induced to form a zygote under simulated conditions in the 
laboratory (In vitro) (outside body) , Zygote or embryo  are transferred into 
the female body for development. ` 
• Test tube baby programme – because initial process is carried out in the laboratory / 
in vitro    
 
 
½x3 
 
 
 
½ 
 
 
 
 
 
 
2 
Page 4


XII_ 044 57/1/1 BIOLOGY # pg. 1 
 
Marking Scheme 
Strictly Confidential 
(For Internal and Restricted use only) 
Senior Secondary School Certificate Examination,2024 
SUBJECT NAME BIOLOGY (Q.P. CODE 57/1/1) 
General Instructions: - 
1  You are aware that evaluation is the most important process in the actual and correct assessment of 
the candidates. A small mistake in evaluation may lead to serious problems which may affect the 
future of the candidates, education system and teaching profession. To avoid mistakes, it is 
requested that before starting evaluation, you must read and understand the spot evaluation 
guidelines carefully. 
2  “Evaluation policy is a confidential policy as it is related to the confidentiality of the 
examinations conducted, Evaluation done and several other aspects. Its’ leakage to public in 
any manner could lead to derailment of the examination system and affect the life and future 
of millions of candidates. Sharing this policy/document to anyone, publishing in any magazine 
and printing in News Paper/Website etc may invite action under various rules of the Board 
and IPC.” 
3  Evaluation is to be done as per instructions provided in the Marking Scheme. It should not be done 
according to one’s own interpretation or any other consideration. Marking Scheme should be 
strictly adhered to and religiously followed. However, while evaluating, answers which are based 
on latest information or knowledge and/or are innovative, they may be assessed for their 
correctness otherwise and due marks be awarded to them. In class-XII, while evaluating two 
competency-based questions, please try to understand given answer and even if reply is not 
from marking scheme but correct competency is enumerated by the candidate, due marks 
should be awarded.  
4  The Marking scheme carries only suggested value points for the answers 
These are in the nature of Guidelines only and do not constitute the complete answer. The students 
can have their own expression and if the expression is correct, the due marks should be awarded 
accordingly. 
5  The Head-Examiner must go through the first five answer books evaluated by each evaluator on the 
first day, to ensure that evaluation has been carried out as per the instructions given in the Marking 
Scheme. If there is any variation, the same should be zero after delibration and discussion. The 
remaining answer books meant for evaluation shall be given only after ensuring that there is no 
significant variation in the marking of individual evaluators. 
6  Evaluators will mark( v ) wherever answer is correct. For wrong answer CROSS ‘X” be marked. 
Evaluators will not put right ( ?)while evaluating which gives an impression that answer is correct 
and no marks are awarded. This is most common mistake which evaluators are committing. 
7  If a question has parts, please award marks on the right-hand side for each part. Marks awarded for 
different parts of the question should then be totaled up and written in the left-hand margin and 
encircled. This may be followed strictly. 
8  
If a question does not have any parts, marks must be awarded in the left-hand margin and encircled. 
This may also be followed strictly. 
9  If a student has attempted an extra question, answer of the question deserving more marks should 
XII_ 044 57/1/1 BIOLOGY # pg. 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
be retained and the other answer scored out with a note “Extra Question”. 
10  No marks to be deducted for the cumulative effect of an error. It should be penalized only once. 
11  A full scale of marks 70 has to be used. Please do not hesitate to award full marks if the answer 
deserves it. 
12  Every examiner has to necessarily do evaluation work for full working hours i.e., 8 hours every day 
and evaluate 20 answer books per day in main subjects and 25 answer books per day in other 
subjects (Details are given in Spot Guidelines).This is in view of the reduced syllabus and number 
of questions in question paper. 
13  Ensure that you do not make the following common types of errors committed by the Examiner in 
the past:- 
? Leaving answer or part thereof unassessed in an answer book. 
? Giving more marks for an answer than assigned to it. 
? Wrong totaling of marks awarded on an answer. 
? Wrong transfer of marks from the inside pages of the answer book to the title page. 
? Wrong question wise totaling on the title page. 
? Wrong totaling of marks of the two columns on the title page. 
? Wrong grand total. 
? Marks in words and figures not tallying/not same. 
? Wrong transfer of marks from the answer book to online award list. 
? Answers marked as correct, but marks not awarded. (Ensure that the right tick mark is 
correctly and clearly indicated. It should merely be a line. Same is with the X for incorrect 
answer.) 
? Half or a part of answer marked correct and the rest as wrong, but no marks awarded.  
14  While evaluating the answer books if the answer is found to be totally incorrect, it should be 
marked as cross (X) and awarded zero (0)Marks. 
15  Any unassessed portion, non-carrying over of marks to the title page, or totaling error detected by 
the candidate shall damage the prestige of all the personnel engaged in the evaluation work as also 
of the Board. Hence, in order to uphold the prestige of all concerned, it is again reiterated that the 
instructions be followed meticulously and judiciously. 
16  The Examiners should acquaint themselves with the guidelines given in the “Guidelines for Spot 
Evaluation” before starting the actual evaluation. 
17  Every Examiner shall also ensure that all the answers are evaluated, marks carried over to the title 
page, correctly totaled and written in figures and words. 
18  The candidates are entitled to obtain photocopy of the Answer Book on request on payment of the 
prescribed processing fee. All Examiners/Additional Head Examiners/Head Examiners are once 
again reminded that they must ensure that evaluation is carried out strictly as per value points for 
each answer as given in the Marking Scheme. 
XII_ 044 57/1/1 BIOLOGY # pg. 3 
 
MARKING SCHEME 
Senior Secondary School Examination, 2024 
BIOLOGY (Subject Code–044) 
[ Paper Code: 57/1/1] 
1 (C) / Maize 1 1 
2. (B) / Human Chorionic Gonadotropin   1 1 
3. (C) / Day 10 to 17 of menstrual cycle.  1 1 
4. (B) / 44 ? XXY– Overall feminine development   1 1 
5. (C) / 2 1 1 
6. (C) / N–glycosidic linkage 1 1 
7. (B) / Allergy 1 1 
8. (D) / Heterotrophic bacteria 1 1 
9. (D) /  Mice 1 1 
10. (A) / Six base pairs 1 1 
11. (D) / High vitamin – A content 1 1 
12. (C) / Secondary productivity and Net primary productivity 1 1 
13. (C) / Assertion (A) is true, but Reason (R) is false. 1 1 
14. (A) / Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation 
of Assertion (A). 
1 1 
15. (D) / Assertion (A) is false, but Reason (R) is true 1 1 
16. (C) / Assertion (A) is true, but reason (R) is false. 1 1 
 SECTION – B   
17. 
A – Wall of fruit / Wall of ripened ovary ,   
B – Scutellum,     
C – Radicle / Plumule / epicotyl / hypocotyl, 
D –Perisperm,  
 
 
 
 
½ x4 
 
 
 
 
 
2 
18 
Name of the Naturalist –Lamarck 
-Evolution of life forms driven by use and disuse of organs.  
 -He said Giraffes in an attempt to forage leaves on tall trees had to adapt by   
  elongation of their necks.  
-They passed on this acquired character of elongated neck to their succeeding generations  
and slowly over the years all the future generations had long necks.                                      
½ 
 
½ 
 
½ 
 
½ 
 
 
 
 
 
 
 
 
 
 
2 
19. 
• Ova from wife or female donor and sperm from husband or male donor are 
collected , induced to form a zygote under simulated conditions in the 
laboratory (In vitro) (outside body) , Zygote or embryo  are transferred into 
the female body for development. ` 
• Test tube baby programme – because initial process is carried out in the laboratory / 
in vitro    
 
 
½x3 
 
 
 
½ 
 
 
 
 
 
 
2 
XII_ 044 57/1/1 BIOLOGY # pg. 4 
 
20. 
(a) 
(i) 
-Readymade or preformed antibodies or antitoxins against the snake venom , 
-A quick immune response is required in this case.   1 
(ii) Passive immunity                                                    
                                                OR 
     OR 
(b)The organic farmers hold the view that complete eradication of pests is not only possible 
but also undesirable because without them beneficial predatory and parasitic insects which 
depend upon them as food or hosts will not survive  /   
  
One of the key belief of organic farmers is that biodiversity furthers health. Greater 
biodiversity leads to more sustainable ecosystem.                                                              
 
 
 
 
 
½ 
 
1 
 
½ 
 
 
 
 
 
 
 
 
2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2 
21. 
A – Zooplankton ,     
B – Phytoplankton ,    
-Inverted pyramid of biomass , 
-Sea Ecosystem/ Aquatic ecosystem     
 
 
 
 
½x4 
 
 
 
 
 
 
2 
 SECTION – C 
 
  
22. 
• -Pills contain progestogens or progestogen – estrogen combination.    
-They inhibit ovulation , and implantation as well as, alter the quality  of  
cervical mucus to prevent or retard the entry of sperms.   
•  -Pills have to be taken daily for a period of 21 days starting within first five 
days of menstrual cycle.    +    
-After a gap of 7 days it has to be repeated in the same pattern till the female 
desires to prevent conception. 
   
½ 
 
½x 3 
 
 
 
½ 
 
 
½ 
 
 
 
 
 
 
 
 
 
 
3 
23. 
(a) 
-Satellite DNA / Repetitive DNA/ VNTR  
 
 
 
1 
 
 
 
 
 
 
Page 5


XII_ 044 57/1/1 BIOLOGY # pg. 1 
 
Marking Scheme 
Strictly Confidential 
(For Internal and Restricted use only) 
Senior Secondary School Certificate Examination,2024 
SUBJECT NAME BIOLOGY (Q.P. CODE 57/1/1) 
General Instructions: - 
1  You are aware that evaluation is the most important process in the actual and correct assessment of 
the candidates. A small mistake in evaluation may lead to serious problems which may affect the 
future of the candidates, education system and teaching profession. To avoid mistakes, it is 
requested that before starting evaluation, you must read and understand the spot evaluation 
guidelines carefully. 
2  “Evaluation policy is a confidential policy as it is related to the confidentiality of the 
examinations conducted, Evaluation done and several other aspects. Its’ leakage to public in 
any manner could lead to derailment of the examination system and affect the life and future 
of millions of candidates. Sharing this policy/document to anyone, publishing in any magazine 
and printing in News Paper/Website etc may invite action under various rules of the Board 
and IPC.” 
3  Evaluation is to be done as per instructions provided in the Marking Scheme. It should not be done 
according to one’s own interpretation or any other consideration. Marking Scheme should be 
strictly adhered to and religiously followed. However, while evaluating, answers which are based 
on latest information or knowledge and/or are innovative, they may be assessed for their 
correctness otherwise and due marks be awarded to them. In class-XII, while evaluating two 
competency-based questions, please try to understand given answer and even if reply is not 
from marking scheme but correct competency is enumerated by the candidate, due marks 
should be awarded.  
4  The Marking scheme carries only suggested value points for the answers 
These are in the nature of Guidelines only and do not constitute the complete answer. The students 
can have their own expression and if the expression is correct, the due marks should be awarded 
accordingly. 
5  The Head-Examiner must go through the first five answer books evaluated by each evaluator on the 
first day, to ensure that evaluation has been carried out as per the instructions given in the Marking 
Scheme. If there is any variation, the same should be zero after delibration and discussion. The 
remaining answer books meant for evaluation shall be given only after ensuring that there is no 
significant variation in the marking of individual evaluators. 
6  Evaluators will mark( v ) wherever answer is correct. For wrong answer CROSS ‘X” be marked. 
Evaluators will not put right ( ?)while evaluating which gives an impression that answer is correct 
and no marks are awarded. This is most common mistake which evaluators are committing. 
7  If a question has parts, please award marks on the right-hand side for each part. Marks awarded for 
different parts of the question should then be totaled up and written in the left-hand margin and 
encircled. This may be followed strictly. 
8  
If a question does not have any parts, marks must be awarded in the left-hand margin and encircled. 
This may also be followed strictly. 
9  If a student has attempted an extra question, answer of the question deserving more marks should 
XII_ 044 57/1/1 BIOLOGY # pg. 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
be retained and the other answer scored out with a note “Extra Question”. 
10  No marks to be deducted for the cumulative effect of an error. It should be penalized only once. 
11  A full scale of marks 70 has to be used. Please do not hesitate to award full marks if the answer 
deserves it. 
12  Every examiner has to necessarily do evaluation work for full working hours i.e., 8 hours every day 
and evaluate 20 answer books per day in main subjects and 25 answer books per day in other 
subjects (Details are given in Spot Guidelines).This is in view of the reduced syllabus and number 
of questions in question paper. 
13  Ensure that you do not make the following common types of errors committed by the Examiner in 
the past:- 
? Leaving answer or part thereof unassessed in an answer book. 
? Giving more marks for an answer than assigned to it. 
? Wrong totaling of marks awarded on an answer. 
? Wrong transfer of marks from the inside pages of the answer book to the title page. 
? Wrong question wise totaling on the title page. 
? Wrong totaling of marks of the two columns on the title page. 
? Wrong grand total. 
? Marks in words and figures not tallying/not same. 
? Wrong transfer of marks from the answer book to online award list. 
? Answers marked as correct, but marks not awarded. (Ensure that the right tick mark is 
correctly and clearly indicated. It should merely be a line. Same is with the X for incorrect 
answer.) 
? Half or a part of answer marked correct and the rest as wrong, but no marks awarded.  
14  While evaluating the answer books if the answer is found to be totally incorrect, it should be 
marked as cross (X) and awarded zero (0)Marks. 
15  Any unassessed portion, non-carrying over of marks to the title page, or totaling error detected by 
the candidate shall damage the prestige of all the personnel engaged in the evaluation work as also 
of the Board. Hence, in order to uphold the prestige of all concerned, it is again reiterated that the 
instructions be followed meticulously and judiciously. 
16  The Examiners should acquaint themselves with the guidelines given in the “Guidelines for Spot 
Evaluation” before starting the actual evaluation. 
17  Every Examiner shall also ensure that all the answers are evaluated, marks carried over to the title 
page, correctly totaled and written in figures and words. 
18  The candidates are entitled to obtain photocopy of the Answer Book on request on payment of the 
prescribed processing fee. All Examiners/Additional Head Examiners/Head Examiners are once 
again reminded that they must ensure that evaluation is carried out strictly as per value points for 
each answer as given in the Marking Scheme. 
XII_ 044 57/1/1 BIOLOGY # pg. 3 
 
MARKING SCHEME 
Senior Secondary School Examination, 2024 
BIOLOGY (Subject Code–044) 
[ Paper Code: 57/1/1] 
1 (C) / Maize 1 1 
2. (B) / Human Chorionic Gonadotropin   1 1 
3. (C) / Day 10 to 17 of menstrual cycle.  1 1 
4. (B) / 44 ? XXY– Overall feminine development   1 1 
5. (C) / 2 1 1 
6. (C) / N–glycosidic linkage 1 1 
7. (B) / Allergy 1 1 
8. (D) / Heterotrophic bacteria 1 1 
9. (D) /  Mice 1 1 
10. (A) / Six base pairs 1 1 
11. (D) / High vitamin – A content 1 1 
12. (C) / Secondary productivity and Net primary productivity 1 1 
13. (C) / Assertion (A) is true, but Reason (R) is false. 1 1 
14. (A) / Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation 
of Assertion (A). 
1 1 
15. (D) / Assertion (A) is false, but Reason (R) is true 1 1 
16. (C) / Assertion (A) is true, but reason (R) is false. 1 1 
 SECTION – B   
17. 
A – Wall of fruit / Wall of ripened ovary ,   
B – Scutellum,     
C – Radicle / Plumule / epicotyl / hypocotyl, 
D –Perisperm,  
 
 
 
 
½ x4 
 
 
 
 
 
2 
18 
Name of the Naturalist –Lamarck 
-Evolution of life forms driven by use and disuse of organs.  
 -He said Giraffes in an attempt to forage leaves on tall trees had to adapt by   
  elongation of their necks.  
-They passed on this acquired character of elongated neck to their succeeding generations  
and slowly over the years all the future generations had long necks.                                      
½ 
 
½ 
 
½ 
 
½ 
 
 
 
 
 
 
 
 
 
 
2 
19. 
• Ova from wife or female donor and sperm from husband or male donor are 
collected , induced to form a zygote under simulated conditions in the 
laboratory (In vitro) (outside body) , Zygote or embryo  are transferred into 
the female body for development. ` 
• Test tube baby programme – because initial process is carried out in the laboratory / 
in vitro    
 
 
½x3 
 
 
 
½ 
 
 
 
 
 
 
2 
XII_ 044 57/1/1 BIOLOGY # pg. 4 
 
20. 
(a) 
(i) 
-Readymade or preformed antibodies or antitoxins against the snake venom , 
-A quick immune response is required in this case.   1 
(ii) Passive immunity                                                    
                                                OR 
     OR 
(b)The organic farmers hold the view that complete eradication of pests is not only possible 
but also undesirable because without them beneficial predatory and parasitic insects which 
depend upon them as food or hosts will not survive  /   
  
One of the key belief of organic farmers is that biodiversity furthers health. Greater 
biodiversity leads to more sustainable ecosystem.                                                              
 
 
 
 
 
½ 
 
1 
 
½ 
 
 
 
 
 
 
 
 
2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2 
21. 
A – Zooplankton ,     
B – Phytoplankton ,    
-Inverted pyramid of biomass , 
-Sea Ecosystem/ Aquatic ecosystem     
 
 
 
 
½x4 
 
 
 
 
 
 
2 
 SECTION – C 
 
  
22. 
• -Pills contain progestogens or progestogen – estrogen combination.    
-They inhibit ovulation , and implantation as well as, alter the quality  of  
cervical mucus to prevent or retard the entry of sperms.   
•  -Pills have to be taken daily for a period of 21 days starting within first five 
days of menstrual cycle.    +    
-After a gap of 7 days it has to be repeated in the same pattern till the female 
desires to prevent conception. 
   
½ 
 
½x 3 
 
 
 
½ 
 
 
½ 
 
 
 
 
 
 
 
 
 
 
3 
23. 
(a) 
-Satellite DNA / Repetitive DNA/ VNTR  
 
 
 
1 
 
 
 
 
 
 
XII_ 044 57/1/1 BIOLOGY # pg. 5 
 
-Do not code for any protein , form a large portion of human genome, show high 
degree of polymorphism                                                    
                                                                                                 (any two points) (ii)Form a large portion of human genome  
(b)  
useful in forensic applications , helps in determining population and genetic 
diversities ,forms the basis of paternity testing , to study evolution, to trace path 
of hereditary diseases. 
                                                                                                              (any two applications)  
 
½+½ 
 
 
 
 
 
 
 
½+½ 
 
 
 
 
 
 
 
 
 
 
 
3 
24. 
(a)  
• Miller experimentally showed formation of amino acids ,  
and this proved theory of chemical evolution of life / formation of organic 
molecules from inorganic molecules. 
• Oparin , Haldane   
       
(b) 
Analysis of meteorite  content also revealed similar compounds indicating that similar 
processes are occurring in space. 
 
 
 
½ 
  
1 
 
½+½ 
 
 
 
 
½ 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3 
25. 
A – Fever / chills / cough / headache / greyish blue lips and nails / severe problem in      
       Respiration , 
B – Salmonella typhi , 
C – Nasal congestion / discharge / sore throat / cough / hoarseness /tiredness, 
D – Microsporum / Trichophyton / Epidermophyton , 
E – Internal bleeding / fever / muscular pain / anaemia / blockage of intestinal passage, 
F – Amoebiasis  / Amoebic dysentery. 
 
 
 
 
 
 
 
½x6 
 
 
 
 
 
 
 
 
 
 
 
3 
26. 
 No,  
 Son inherited disease from the mother and daughter inherited disease from both mother and 
father.   
  
                 Mother                                               Father 
                                X
C
X (1/2 Mark)            X                 X
C
Y (1/2 Mark) 
                             Normal (Carrier)                                Colour blind 
½ 
 
½ 
 
 
 
 
½+½