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Class 12 Biology Answer Key 2023
CBSE Class 12 Biology Answer Key 2023: The CBSE has conducted the Class 12 board exam for the Biology paper today on 16th March 2023. The complete Class 12 Biology Answer Key will be provided here as discussed by teachers for each question asked in today’s Biology Class 12 board exam. The students must be excited to know their probable scores to be scored in the Biology exam, and you can check to match your responses from our Biology Answer Key Class 12 Today Exam.
CBSE Class 12 Biology Answer Key 2023
Therefore no confirmation about the release of the official Biology Answer Key. However, students can check their probable score using the unofficial Class 12 Biology Answer Key 2023 as prepared by our subject experts and teachers in this article.
|CBSE Class 12 Biology Answer Key 2023|
|Exam Conducting Body||Central Board of Secondary Education|
|Class||CBSE Class 12|
|Post Category||Answer Key|
|Biology Class 12 Exam Date||16th March 2023 (Thursday)|
|Biology Answer Key Class 12 (Unofficial )||16th March 2023|
Class 12 Biology Answer Key 2023 (Paper Code- 57/5/1)
CBSE has set the question papers in different sets. Here we have provided the Class 12 Biology Answer Key with Question Paper PDF along with the correct answers to the questions asked. Connect with us to get accurate Class 12 Biology Answer Key 2023 for Paper Code- 57/5/1.
Q1. At which stage evolution did human use hides to protect their bodies and buried their dead?
a) Homo habilis
b) Neanderthal man
c) Java man
d) Homo erectus
Correct Answer- b) Neanderthal man
Q2. Given below are Column A with a list of certain Assisted Reproductive Technologies (ART) and in Column B the procedures followed during ART:
|Column A||Column B|
|SNo||Names of Art||SNo||Procedure|
|A||GIFT||(i)||Transfer of ovum from a donor into the fallopian tube of another female.|
|B||ICSI||(ii)||Transfer of semen from the donor into the
vagina of the female.
|C||ZIFT||(iii)||Injecting sperms directly into the ovum.|
|D||IUI||(iv)||Transfer of early embryos into the fallopian tube.|
Choose the option where ART correctly matches with the procedure.
a) (A)–(i), (B)–(ii), (C)–(iii), (D)–(iv)
b) (A)–(iv), (B)–(i), (C)–(ii), (D)–(iii)
c) (A)–(iv), (B)–(iii), (C)–(i), (D)–(ii)
(d) (A)–(i), (B)–(iii), (C)–(iv), (D)–(ii)
Correct Answer- (d) (A)-(i), (B)-(iii), (C)-(iv), (D)-(ii)
Q3. The decrease in the T-lymphocytes count in human blood will result in:
a) Decrease in antigens
b) Decrease in antibodies
c) Increase in antibodies
d) Increase in antigens
Correct Answers- d) Increase in antigens
Q4. Given below is a sequence of bases in mRNA of a bacterial cell. Identify the amino acid that would be incorporated at codon position 3 and codon position 5 during the process of its translation.
3‘ AUCAGGUUUGUGAUGGUACGA 5‘
a) Phenylalanine, Methionine
b) Cysteine, Glycine
c) Alanine, Proline
d) Serine, Valine
Correct Answers- c) Alanine, Proline
Q5. A Tight one-to-one relationship between many species of fig tree and certain wasps is an example of –
Correct Answers- d) Mutualism
Q6. Select the pathogen mismatched with the symptoms of disease caused by it from the list given below
(a) Entamoeba histolvtica : Constipation, abdominal pain.
(b) Epidermophyton: Dry scaly lesions on nail
(c) Wuchereria bancrofti: Chronic inflammation of lymphatic vessels of lower limb
(d) Haemophilus influenzae : Blockage of the intestinal passage.
Correct Answer- (d) Haemophilus influenzae : Blockage of the intestinal passage.
Q7. The primary productivity in an ecosystem is expressed as:
a) gm-2 yr-1
b) gm-2 yr
c) Kcal m-2 yr-1
d) K cal m-2
Correct Answer- (d) K cal m-2
Q8. Given below is the restriction site of a restriction endonuclease Pst-I and the cleavage sites on a DNA molecule.
Correct Answer- d)
Q9. The IUCN Red Data List (2004) in the last 500 years documents the extinction of nearly 784 species including:
a) 330 invertebrates
b) 338 invertebrates
c) 359 invertebrates
d) 362 invertebrates
Correct Answer- c) 359 invertebrates
Q10. Given below are the list of the commercially important products and their source organisms. Select the option that gives the correct matches.
|List A||List B|
|Bioactive Products||Microbes (Source Organism)|
|(A) Cyclosporin A||(i) Streptococcus|
|(B) Statins||(ii) Tricoderma polysporum|
|(C) Streptokinase||(iii) Penicillium notatum|
|(D) Penicillin||(iv) Monascus purpureus|
a) (A)-(i), (B) -(ii), (C)-(iii), (D)-(iv)
b) (A)-(iii), (B)-(iv), (C)-(ii), (D)-(i)
c) (A)-(iv), (B)-(iii), (C)-(ii), (D)-(i)
d) (A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)
Correct Answer- d) (A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)
Q11. Important attributes belonging to a population but not to an individual are
(i) Birth rate and death rate
(ii) Male and female
(iii) Birth and death
Select the correct option from the given options :
(a) (i) only
(b) (ii) only
(c) (ii) and (iii)
(d) (i) and (iv)
Correct Answer- (d) (i) and (iv)
CBSE Class 12 Biology Answer Key & Question Paper 2023
Here, we have provided the complete Class 12 Biology Answer Key 2023 here with correct answers one by one. So if are looking for the complete CBSE Class 12 Biology Answer Key do check the questions & their answers below for