What is the exam pattern of BSEB Class 12 Biology Exam?

Bihar Board 12th Biology Answer Key 2024, Check Class 12 Biology Question Paper PDF Download

Table of Contents

The Bihar School Examination Board has started the BSEB Intermediate exams for the academic session 2023-24. As per the schedule, the Class 12th Biology exam is administered during the first shift, from 9:30 a.m. to 12:15 p.m. The official Bihar Board 12th Biology Answer Key will be released along with all subjects in March by BSEB. we share the unofficial Bihar Board Class 12th Biology Answer Key 2024 and Bihar Board 12th Question Paper 2024 pdf with answers on this page.

Bihar Board 12th Biology Answer Key 2024

Bihar Board 12th Class Biology Answer Key 2024 provides you the the correct answers with specific question marking which helps students to predict their score on the Biology Exam. Students who took the Class 12 Biology Exam are eagerly looking for the Bihar Board 12th Biology Answer Key for their shifts. To make it easier for students, we have released the Bihar Board 12th Biology Answer Key 2024 of Sets A to J. Instead of visiting many websites, stay with us and compare responses to the Bihar Board Class 12 Biology Answer Key 2023 provided on this page.

Bihar Board Class 12 Biology Question Paper 2024: Pattern

It is crucial to know the marks distribution while analyzing the Bihar Board 12th Biology Answer Key 2024. The 12th Biology test will be worth 70 points, with 30 of those points being practical. There will be a 70-mark theory exam with 50% objective questions and 50% short and long answer questions.

In subjective type questions, there will be 20 questions of 2 marks each, which you will have to answer just 10 questions, and 6 questions of 5 marks, which you will have to answer. Only three questions have to be answered. Check out the Overview of the Bihar Board 12th Biology Question Paper 2024.

Bihar Board Class 12 Biology Answer Key 2024
Examination Name	Bihar Board Class 12 Biology Exam 2024
Exam conducting Body	Bihar school examination board
Category	Answer Key
Unofficial Bihar Board 12th Biology Answer Key 2024	Out
official Bihar Board Class 12 Biology Answer Key 2024	March 2024
Class 12 Biology Total Marks	100 Marks Practical -30 Marks Theory -70 Marks
Negative Marking	No
Marking Scheme	MCQs -35 Marks (1Mark x 35) Short Type Questions- (2 Marks x 5) Short Type Questions- (5 Marks x 3)

Bihar Board 12th Biology Question Paper 2024 pdf with answers -All Sets

The Bihar board 12th Question paper 2024 pdf with answers is free of errors and has been prepared by Adda247’s qualified faculty. After the exam, you can download all of the question paper answers for the Bihar Board Class 12th Biology Exam 2024, from Set A to Set J, The Bihar Board Class 12th Biology Answer Key 2024 for All Sets will be shared shortly.

Set Code	Bihar Board Class 12th Biology Answer Key 2024
Set (A)	Available soon
Set (B)	Download PDF
Set (C)	Available soon
Set (D)	Available soon
Set (E)	Available soon
Set (F)	Download PDF
Set (G)	Download PDF
Set (H)	Available soon
Set (I)	Available soon
Set (J)	Available soon

Bihar Board Class 12th Time Table 2024

Bihar Board Class 12 Biology Question Paper 2024 PDF Download

To predict their score, Candidates can check out the Bihar Board Class 12 Biology Question Paper 2024 PDF Download given below.

Bihar Board 12th Biology Question Paper 2024 with Answers

The Actual Bihar board biology question paper 2024 includes both Objective type and subjective type questions which are divided into two sections- Section A and Section B. The Total mark of the Class 12 Biology question Paper is 70 Maks is divided into 3 sections: 35 Mraks for MCQs(35Χ1marks), 20 marks for Short Type Answers (10Χ2marks), and the remaining 15 marks allotted for three Long Answer Type Questions (3Χ5marks). Candidates have a total of 3 Hours 15 minutes to complete the whole bihar board biology question paper 2024.

Section A

Q. Which of the following reproduces once in a lifetime?

(A)Pacific salmon fish and bamboo

(B) Mammals

(D) Litchi and mango

Answer:(A)Pacific salmon fish and bamboo

Q. Biodiversity of India is what percentage of the total global species diversity ?

(A) 2-4%

(B)8.1%

(D) 9

Answer: (B)8.1%

Q. What was the reason for extinction of more than 200 species of Cichlid fish in Lake Victoria ?

(A) Co-extinction

(B) Alien species invasion

(D) Habitat loss

Answer: (B) Alien species invasion

Q. Which of the following is not the reason for global warming?

(A) Use of fossil fuels

(B) Deforestation

(D) Improvement in the efficiency of energy use

Answer:(D) Improvement in the efficiency of energy use

Q.What was the reason for co-existence of five closely related species – of warblers ?

(A) Competitive exclusion

(B) Resource partitioning

(D) Commensalism

Answer: (A) Competitive exclusion

Q. Which of the following cells is haploid?

(A) Oogonia

(B) Primary oocyte

(D) Zygote

Answer:(C) Secondary oocyte

Q.After ovulation the ovum is surrounded by a group of cells called

(A) Corona radiata

(B) Zona pellucida

(D) Theca layer

Answer: (B) Zona pellucida

Q. Which of the following statements is incorrect about temperature?

(A) Temperature is the most important environmental factor

(B) Temperature decreases from the equator towards the pole

Answer : (C) Temperature increases with increase in height

Q. At which level is natural selection operated to evolve the desired traits ?

(A) Individual level

(B) Population level

(D) Ecosystem level

Answer:(B) Population level

Q. When the percentage of individuals of pre reproductive, reproductive and post-reproductive phase is in decreasing order in the age pyramid of human population, it shows that population is

(A) Expanding

(B) Decreasing

(D) Unstable

Q.What was the reason for co-existence of five closely related species of warblers ?

(A) Competitive exclusion

(B) Resource partitioning

(D) Commensalism

Q.Which of the following reproduces once in a lifetime?

(A) Pacific salmon fish and bamboo

(B) Mammals

(D) Litchi and mango

Q. Which of the following plants produces poisonous cardiac glycoside?

(A) Cactus

(B) Calotropis

(D) Tobacco

Q.A new contraceptive pill which is non-steroidal is referred as

(A) LNG 20.

(B) Progestaset

(D) Lippes loop

Q. What is the population growth rate of India as per 2001 census ?

(A) 1-1%

(B) 3-7%

(D) 3%

Answer: C

Q. Which of the following IUDs is hormone releasing?

(A) Multiload 375

(B) LNG-20

(D) Cu-T

BSEB 12th Biology Question Paper 2024 with Answer key

1. What is the meaning of charging of t-RNA?
(A) Linking of amino acid with cognate t-RNA
(B) Attachment of t-RNA with ribosome
(C) Translation of RNA
(D) Modification of RNA

Answer: (B) Attachment of t-RNA with ribosome

2. Which of the following is not a termination codon?
(A) UAG
(B) UGA
(C) AUG
(D) UAA

Answer: (C) AUG

3. Which of the following blood cells is known as PMNL?
(A) Lymphocyte
(B) Monocyte
(C) Neutrophil
(D) Platelets

Answer: (C) Neutrophil

4. Which of the following is abundantly found in colostrum?
(A) IgA
(B) IgG
(C) IgM
(D) IgD

Answer: (A) IgA

5. Which of the following is a non-infectious disease?
(A) AIDS
(B) Malaria
(C) Cancer
(D) Typhoid

Answer: (C) Cancer

Answers to the remaining exam questions will be updated shortly.

BSEB Class 12th Biology Answer Key 2024 Set B

Bihar Board 12th Biology Answer Key 2024 for Set B is given below.

Bihar Board 12th Biology Answer Key 2024 for Set B
Question Number	Correct Answer	Question Number	Correct Answer
1	C	36	A
2	A	37	C
3	NA	38	B
4	NA	39	D
5	NA	40	C
6	B	41	C
7	B	42	A
8	C	43	D
9	D	44	B
10	D	45	B
11	B	46	B
12	D	47	C
13	A	48	B
14	B	49	A
15	D	50	B
16	D	51	C
17	D	52	A
18	C	53	C
19	B	54	C
20	B	55	C
21	B	56	B
22	C	57	D
23	B	58	B
24	B	59	A
25	A	60	B
26	B	61	B
27	B	62	D
28	C	63	D
29	D	64	A
30	A	65	C
31	A	66	D
32	D	67	C
33	B	68	C
34	C	69	A
35	B	70	A

Bihar Board Answer Key Biology 2024 Set G

Bihar Board 12th Biology Answer Key 2024 for Set G is given below.

Bihar Board 12th Biology Answer Key 2024 Set G
Question Number	Correct Answer	Question Number	Correct Answer
1	D	36	D
2	B	37	A
3	A	38	A
4	B	39	D
5	B	40	C
6	D	41	C
7	D	42	B
8	C	43	A
9	A	44	C
10	C	45	B
11	C	46	C
12	A	47	C
13	B	48	A
14	B	49	A
15	C	50	C
16	B	51	D
17	B	52	D
18	A	53	C
19	C	54	A
20	B	55	B
21	A	56	B
22	A	57	A
23	C	58	C
24	B	59	A
25	D	60	C
26	C	61	C
27	C	62	C
28	A	63	B
29	C	64	C
30	B	65	A
31	B	66	A
32	B	67	A
33	D	68	B
34	D	69	B
35	A	70	C

Bihar Board Class 12th Biology Answer Key 2024 Set F

Bihar Board 12th Biology Answer Key 2024 for Set F is given below.

Bihar Board 12th Biology Answer Key 2024 Set F
Question Number	Correct Answer	Question Number	Correct Answer
1	A	36	A
2	C	37	C
3	B	38	D
4	D	39	C
5	C	40	C
6	C	41	A
7	A	42	A
8	D	43	D
9	B	44	NA
10	B	45	A
11	B	46	D
12	B	47	C
13	D	48	C
14	D	49	B
15	D	50	C
16	A	51	B
17	A	52	B
18	A	53	B
19	B	54	D
20	B	55	A
21	C	56	A
22	C	57	C
23	D	58	A
24	D	59	C
25	C	60	C
26	A	61	A
27	B	62	B
28	B	63	B
29	C	64	A
30	B	65	C
31	D	66	A
32	B	67	C
33	C	68	C
34	B	69	C
35	A	70	B

Bihar Board 12th Biology Important MCQs with Answers

Instructions: The following Questions have four options, out of which only one is correct. Answer the following Questions-

1. According to IUCN, how many animal and plant species occur on earth ?
(A) Slightly more than 1.5 million (B) 7 million
(C) 20-25 million (D) 3 million

Answer: (A) Slightly more than 1.5 million

2. Who propounded Competitive Exclusion Principle ?
(A) Mac Arthur (B) Gause
(C) Connell (D) Darwin

Answer: (B) Gause

3. Organisms that can tolerate a variable wide range of temperatures are called as –
(A) Eurythermal (B) Stenothermal
(C) Cold blooded (D) Warm blooded

Answer: (A) Eurythermal

4. The name of M. S. Swaminathan is associated with which of the following fields ?
(A) Ecology (B) Biotechnology
(C) Green revolution (D) Milk production

Answer: (C) Green revolution

5. Golden rice is rich in which of the following ?
(A) Vitamin B1 (B) Vitamin B2
(C) Vitamin C (D) Vitamin A

Answer: (D) Vitamin A

6. Which of the following micro-organisms is utilized to prepare “SwissCheese” ?
(A) Penicillium roqueforti (B) Propionibacterium sharmanii
(C) Yeast (D) Lactic acid bacteria

Answer: (B) Propionibacterium sharmanii

7. In which of the following plants adventitious buds develop from leaves?
(A) Ginger (B) Banana
(C) Dahlia (D) Bryophyllum

Answer: (D) Bryophyllum

8. Sporozoite is the infective stage of which of the following diseases ?
(A) Malaria (B) Typhoid
(C) AIDS (D) Pneumonia

Answer: (A) Malaria

9. In which of the following XO – Male type of sex determination is observed ?
(A) Grasshopper (B) Honey bee
(C) Human (D) Birds

Answer: (A) Grasshopper

10. In which of the following organism meiosis does not occur during gamete formation ?
(A) Haploid organism (B) Diploid organism
(C) Human (D) Chimpanzee

Answer: (B) Diploid organism

11. Who propounded Central Dogma ?
(A) Watson (B) Crick
(C) Wilkins (D) R. Franklin

Answer: (B) Crick

12. In Lac operon where does repressor protein bind ?
(A) Operator (B) Promoter
(C) Structural gene (D) Regulator gene

Answer: (A) Operator

13. In seeds of pepper, remnant of nucellus persists, which is called as –.

(A) Chalazosperm (B) Endosperm
(C) Pseudo embryo sac (D) Perisperm

Answer:(D) Perisperm

14. If production of seeds occurs without fertilization, it is called as —- .
(A) Amphimixis (B) Apomixis
(C) Parthenocarpy (D) Parthenogenesis

Answer: (B) Apomixis

15. RNA polymerase III is not responsible for synthesis of which of the following ?
(A) hn RNA (B) t RNA
(C) 5 sr RNA (D) sn RNA

Answer: (C) 5 sr RNA
16. Pollen grains are well preserved as fossils because —.
(A) Pollen grain has a wall
(B) Wall has exine of sporopollenin
(C) Wall has intine of pectocellulose
(D) Wall has cellulose

Answer:

17. Backbone of polynucleotide chains of DNA is composed of which of the following ?
(A) Sugar-phosphate-base (B) Phosphate-base
(C) Sugar-phosphate (D) Stack of paired bases

Answer: (C) Sugar-phosphate

18. Which one is Genotypic ratio of F2 generation of monohybrid cross conducted by Mendel ?
(A) 3 : 1 (B) 1 : 2 :1
(C) 9 : 3 : 3 : 1 (D) 1 : 1

Answer: (B) 1 : 2 :1
19. Which of the following secretes gonadotropin releasing hormone ?
(A) Ovary (B) Testis
(C) Posterior pituitary gland (D) Hypothalamus

Answer: (D) Hypothalamus
20. After fertilization, wall of ovary develops into which structure ?
(A) Epicarp (B) Seed
(C) Mesocarp (D) Pericarp

Answer: (D) Pericarp

Bihar Board Class 12th Biology Guess Questions with Answers – SAQs

1. Give the Two reasons of extinction of some wild animals.

Answer: If action is not taken to safeguard wildlife, certain species may go extinct entirely. Look at the causes behind the extinction of certain wild animals.

Destruction of their natural habitats due to forest fires, overgrazing, urbanisation, etc.
limitless deforestation.
Overuse of the environment’s resources.
Hunting and poaching of wildlife without a permit.

2. Write the name of two antibiotices which are Obatined from bacteria.

Answer: Among the well-known antibiotics obtained from bacteria are streptomycin, tetracycline, and erythromycin.

3. What are the names of the constituent cells of the embryo sac?

Answer: The embryo sac is haploid and multicellular. There are eight nuclei in it. Of the eight nuclei, four are located near the end of the chalazal, and the remaining four at the end of the micropylar. The core nuclei, antipodal cells, and egg apparatus make up the embryo sac.

4. Define Greenhouse effect. Write down name of two Greenhouse gases.

Answer: The process by which solar radiation is absorbed by greenhouse gases rather being reflected back into space is known as the greenhouse effect. The earth’s temperature has significantly increased as a result of the rising greenhouse gas concentrations. This has had a number of extreme consequences.

Name of two Greenhouse gases are carbon dioxide, chlorofluorocarbons.

5. What is vital index? Write the formula to find it

Answer: The Vital Index is the ratio of births to deaths within a population during a specific period of time.

The formula to find vital index is = Natality / Mortality x 100

A population’s birth rate, also known as its natality rate, is the number of births per 1,000 people in the population annually. A population’s annual death rate, also known as its mortality rate, is typically stated as the number of deaths per 1,000 people.
As a result, the vital index formula is Natality / Mortality x 100

6. Define biodiversity and explain its importance.

Answer: The distinctions and variation among living things from all origins are referred to as biological diversity or biodiversity. The evolution of life from genes to ecosystems, including species’ existence, genetic variations, environments, populations, and the ecosystems in which they coexist, as well as other evolutionary developments that maintain the system’s ability to function, change, and adapt, is broadly characterized by biological diversity.

The mechanisms that sustain all life on Earth, including human existence, depend on biodiversity. The healthy ecosystems that give us the oxygen to breathe and the food to eat are dependent on a diverse range of animals, plants, and microorganisms.

7. Name the causal organism of the following diseases.
(A) Tuberculosis
(B) Filaria
(C) AIDS
(D) Ring worm

Answer:

(A) Tuberculosis – Mycobacterium tuberculosis.
(B) Filaria -Wuchereria bancrofti and Brugia malayi
(C) AIDS- Human immunodeficiency virus (HIV)
(D) Ring worm -Trichophyton, Microsporum, and Epidermophyton.

8. What are the difference between DNA and RNA?

Answer: The are major differences that difference between DNA and RNA are
(a) RNA includes ribose, whereas DNA contains the slightly different chemical deoxyribose.
(b) Unlike DNA, most RNA molecules are single-stranded and can adopt very complex three-dimensional structures.NA is double-stranded while RNA is single-stranded.
(c) RNA has the nucleobase uracil, whereas DNA has thymine.

9. Why is restriction endonuclease called as ‘molecular scissors’ ?

Answer: Restriction enzymes are also known as “molecular scissors” because they cut DNA at or near certain recognition sequences known as restriction sites. These enzymes, also known as restriction endonucleases, make one incision in each of the two strands of DNA

10. What is an endemic species ?

Answer: Endemic species are ones that can only be found in one place and nowhere else on the planet. For example, endemic species such as Galápagos tortoises and Madagascar lemurs can be found on small islands. Big islands offer the same remoteness, but on a greater scale.

Bihar Board 12th Model Question Paper 2024 for All Subjects