Sample papers for 12th Class Biology Practice Paper - 2

	Column I		Column II
A	Non-parental gene exchange	1	Crossing over
B	Non-sister chromatids	2	X and Y
C	Sex chromosome	3	Autosome-linked disease
D	Thalassemia	4	Recombination

Codes

A)

A-4 B-1 C-2 D-3

B)

A-2 B-1 C-4 D-3

C)

A-2 B-4 C-3 D-1

D)

A-2 B-4 C-1 D-3

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15)

Direction: Each of the question has four options out of which only one is correct. Select the correct option as your answer.

Conditions of a karyotype \[2n\pm 1\] and \[2n\pm 2\] are called

A)

aneuploidy

B)

polyploidy

C)

allopolyploidy

D)

monosomy

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16)

Direction: Each of the question has four options out of which only one is correct. Select the correct option as your answer.

If a boy's father has haemophilia and his mother has one gene for haemophilia, what is the chance that the boy will inherit the disease?

A)

25%

B)

50%

C)

75%

D)

100%

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17)

Direction: Each of the question has four options out of which only one is correct. Select the correct option as your answer.

VNTR belongs to the class of satellite DNA referred to as

A)

microsatellite DNA

B)

minisatellite DNA

C)

megasatellite DNA

D)

repetitive DNA

View Answer

18)

Direction: Each of the question has four options out of which only one is correct. Select the correct option as your answer.

Aminoacyi synthetase is responsible for

A)

formation of peptide bond

B)

binding of mRNA to ribosomes

C)

attaching an amino group to amino acid

D)

joining of amino acid to tRNA

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19)

Direction: Each of the question has four options out of which only one is correct. Select the correct option as your answer.

Which of the following is a nucleoside?

A)

Adenosine

B)

Adenine

C)

Deoxyribose

D)

Adenylicacid

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20)

Direction: Each of the question has four options out of which only one is correct. Select the correct option as your answer.

What was unique in Griffith's experiments?

A)

DNA was found to be the genetic material

B)

RNA was found to be the genetic material

C)

Something from dead organisms could change the living cells

D)

The genetic makeup of dead and living organisms were the same

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21)

Direction: Each of these questions contains two statements :

Assertion and Reason. Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below.

Assertion [A] Endosperm is a nutritive tissue and it is triploid.

Reason [R] Endosperm is formed by the fusion of secondary nucleus to the nucleus of male gamete.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true, but R is not the correct explanation of A

C)

A is true, but R is false

D)

A is false, but R is true

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22)

Direction: Each of these questions contains two statements :

Assertion and Reason. Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below.

Assertion [A] Ovum retains most of the contents of the primary oocyte and is much larger than a spermatozoan.

Reason [R] Ovum needs energy to go about in search of a spermatozoan for fertilization.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true, but R is not the correct explanation of A

C)

A is true, but R is false

D)

A is false, but R is true

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23)

Direction: Each of these questions contains two statements :

Assertion and Reason. Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below.

Assertion [A] Family planning is done by using contraceptive methods.

Reason [R] Natural contraceptive methods include condoms, diaphragms, etc., while barrier methods include periodic abstinence, lactational amenorrhea, etc.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true, but R is not the correct explanation of A

C)

A is true, but R is false

D)

A is false, but R is true

View Answer

24)

Direction: Each of these questions contains two statements :

Assertion and Reason. Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below.

Assertion [A] A monocistronic mRNA can produce several types of polypeptide chains.

Reason [R] The terminator codon is present on the mRNA.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true, but R is not the correct explanation of A

C)

A is true, but R is false

D)

A is false, but R is true

View Answer

25)

Direction: Each of these questions contains two statements :

Assertion and Reason. Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below.

Assertion [A] The law of segregation is universally accepted with no exception.

Reason [R] It states that out of two alleles, only one is passed on to the offspring.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true, but R is not the correct explanation of A

C)

A is true, but R is false

D)

A is false, but R is true

View Answer

26)

Direction: Observe the diagram given below of the lac operon showing an operon of inducible enzymes and answer the following questions.

Why glucose and galactose cannot act as an inducer for lac operon?

A)

Because they cannot bind with the represser

B)

Because they can bind with the represser

C)

Because they can bind with the operator

D)

Because they can bind with the regulator

View Answer

27)

Direction: Observe the diagram given below of the lac operon showing an operon of inducible enzymes and answer the following questions.

In lac operon, a represser comprises

A)

DNA

B)

RNA

C)

protein

D)

lactose

View Answer

28)

Direction: Observe the diagram given below of the lac operon showing an operon of inducible enzymes and answer the following questions.

Which enzyme (s) will be produced in a cell in which there is a non-sense mutation in the lacy-gene?

A)

p-galactosidase

B)

Lactose permease

C)

Transacetylase

D)

Lactose permease and transacetylase

View Answer

29)

Direction: Observe the diagram given below of the lac operon showing an operon of inducible enzymes and answer the following questions.

Lactose is a substrate for

A)

galactosidase

B)

\[\alpha \]-galactosidase

C)

\[\beta \]-galactosidase

D)

\[\gamma \]-galactosidase

View Answer

30)

Direction: Observe the diagram given below of the lac operon showing an operon of inducible enzymes and answer the following questions.

Lactose is transported into cells through

A)

\[\beta \]-galactosidase

B)

permease

C)

transacetylase

D)

transferase

View Answer

31)

Direction: Read the following and answer the questions that follows.

In a historic move to provide universal access to reproductive health services, India amended the Medical Termination of Pregnancy (MTP) Act, 1971 to further empower women by providing comprehensive abortion care to all. The new Medical Termination of Pregnancy (Amendment) Act 2021 expands the access to safe and legal abortion services on therapeutic, eugenic, humanitarion and social grounds to ensure universal access to comprehensive care. The new law, which came into force from 25 March 2021, will contribute towards ending preventable maternal mortality to help meet the sustainable development goals.

MTP is used to

A)

discontinue the pregnancy if dangerous for the mother

B)

get rid of unwanted pregnancy

C)

discontinue the pregnancy if dangerous for foetus

D)

All of the above

View Answer

32)

Direction: Read the following and answer the questions that follows.

In a historic move to provide universal access to reproductive health services, India amended the Medical Termination of Pregnancy (MTP) Act, 1971 to further empower women by providing comprehensive abortion care to all. The new Medical Termination of Pregnancy (Amendment) Act 2021 expands the access to safe and legal abortion services on therapeutic, eugenic, humanitarion and social grounds to ensure universal access to comprehensive care. The new law, which came into force from 25 March 2021, will contribute towards ending preventable maternal mortality to help meet the sustainable development goals.

MTP along with amniocentesis is being ...A.. to abort even normal healthy ...A.. foetus.

A)

A-used, B-male

B)

A-misused, B-female

C)

A-helpful, B-female

D)

A-helpful, B-unwanted

View Answer

33)

Direction: Read the following and answer the questions that follows.

In a historic move to provide universal access to reproductive health services, India amended the Medical Termination of Pregnancy (MTP) Act, 1971 to further empower women by providing comprehensive abortion care to all. The new Medical Termination of Pregnancy (Amendment) Act 2021 expands the access to safe and legal abortion services on therapeutic, eugenic, humanitarion and social grounds to ensure universal access to comprehensive care. The new law, which came into force from 25 March 2021, will contribute towards ending preventable maternal mortality to help meet the sustainable development goals.

To maintain reproductive health of the society, it is essential to

A)

provide sex education in schools

B)

prevent and control sexually transmitted diseases by providing proper information about reproductive organs, safe and hygienic practices

C)

develop various programmes such as family planning programmes and RCH

D)

All of the above

View Answer

34)

Direction: Read the following and answer the questions that follows.

In a historic move to provide universal access to reproductive health services, India amended the Medical Termination of Pregnancy (MTP) Act, 1971 to further empower women by providing comprehensive abortion care to all. The new Medical Termination of Pregnancy (Amendment) Act 2021 expands the access to safe and legal abortion services on therapeutic, eugenic, humanitarion and social grounds to ensure universal access to comprehensive care. The new law, which came into force from 25 March 2021, will contribute towards ending preventable maternal mortality to help meet the sustainable development goals.

Which of the following factors can cause problems related to reproductive health?

A)

Misuse of amniocentesis

B)

Myths and misconceptions regarding sex-related aspects

C)

Congenital or acquired infertility

D)

All of the above

View Answer

35)

Direction: Read the following and answer the questions that follows.

In a historic move to provide universal access to reproductive health services, India amended the Medical Termination of Pregnancy (MTP) Act, 1971 to further empower women by providing comprehensive abortion care to all. The new Medical Termination of Pregnancy (Amendment) Act 2021 expands the access to safe and legal abortion services on therapeutic, eugenic, humanitarion and social grounds to ensure universal access to comprehensive care. The new law, which came into force from 25 March 2021, will contribute towards ending preventable maternal mortality to help meet the sustainable development goals.

Assertion [A] The MTP (Amedment) Act, 2017 was enacted by government of India to reduce illegal abortions and consequent maternal mortality.

Reason [R] The opinion of two registered medical practitioners is required to carryout MTP if pregnancy has lasted more than 12 weeks.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true, but R is not the correct explanation of A

C)

A is true, but R is false

D)

A is false, but R is true

View Answer

12th Class Biology Sample Paper

done Practice Paper - 2 Total Questions - 35 [Download]

Practice Paper - 2 Total Questions - 35 [Download]