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Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Class 12 MCQ


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30 Questions MCQ Test Sample Papers for Class 12 Medical and Non-Medical - Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22)

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) for Class 12 2024 is part of Sample Papers for Class 12 Medical and Non-Medical preparation. The Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) questions and answers have been prepared according to the Class 12 exam syllabus.The Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) MCQs are made for Class 12 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) below.
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Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 1

In the figure of anatropous ovule given below, choose the correct option for the characteristic distribution of cells within the typical embryo sac 

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 1

At the micropylar end out of the four nuclei, only three differentiate into two synergids and one egg cell. Together they are known as egg apparatus.  The egg apparatus consists of 2 synergids and one egg cell. The synergids have special cellular thickenings at the micropylar tip. These are together called the filiform apparatus. It helps to guide the pollen tubes into the synergid. Similarly, at the chalazal end, three out of the four nuclei differentiate as antipodal cells.  The remaining two cells (of the micropylar end and the chalazal end) move towards the center and are known as polar nuclei, which are situated in a large central cell.  Hence, at maturity, a typical mature angiosperm embryo sac (the female gametophyte) appears as a 7-celled structure, though it has 8-nucleate.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 2

The coconut water from tender coconut is

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 2

The tender coconut water is a free-nuclear endosperm (made up of thousands of nuclei) and the surrounding white kernel is the cellular endosperm.

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Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 3

Pollen grains are well preserved as fossils because of presence of

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 3

Pollen grains are well preserved as fossils due to the presence of sporopollenin. Sporopollenin is a highly resistant organic material, which can withstand high temperature and strong acids and alkali. Enzymes cannot degrade sporopollenin.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 4

Which of the following statements are true related to Seed X and Y ?

(i) Seed X is dicot and endospermic or albuminous.
(ii) Seed X is dicot and non-endospermic or non-albuminous.
(iii) Seed Y is monocot and endospermic or albuminous.
(iv) Seed Y is monocot and non-endospermic or non-albuminous.
Choose the correct option with the respect to the nature of the seed:

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 4

The seed X is dicot and is non-endospermic whereas seed Y is monocot and is endospermic.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 5

Which of the following statements are correct with respect to hormones secreted by placenta?
(i) Placenta secretes relaxin during later stage of pregnancy
(ii) Placenta secretes high amount of FSH during pregnancy
(iii) Placenta secretes relaxin during initial stage of pregnancy
(iv) Placenta secretes hCG and hPL during pregnancy

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 5

Placenta acts as an endocrine gland by secreting Human chorionic gonadotropin (hCG), human placental lactogen (hPL), oestrogens, progesterone and relaxin.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 6

Figure A shows the front view of the human female reproductive system and Figure B shows the development of a fertilized human egg cell:
Figure A 

Figure B

Identify the correct stage of development of human embryo (Figure B) that takes place at the site X, Y and Z respectively in the human female reproductive system (Figure A).
Choose the correct option from the table below:

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 6

The label X represent uterus. Blastocyst gets attached at this site. The label Y is the fallopian tube where the process of fertilisation takes place. The label Z represents ovaries where egg is produced by the process of oogenesis. 

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 7

Penetration of the sperm in the ovum is followed by:

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 7

Penetration of the sperm in the ovum is followed by completion of meiosis II.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 8

The correct sequence of hormone secretion from beginning of menstruation is:

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 8

The correct sequence of hormone secretion from beginning of menstruation is  FSH, estrogen, and progesterone. 

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 9

In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 9

In the dioecious aquatic plant shown, the flowers are small and white in colour. The pollen grains have a mucilaginous covering to protect from wetting.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 10

The thalamus contributes to the fruit formation in:

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 10

Such fruits are called false fruits.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 11

How many types of gametes would be produced if the genotype of a parent is AaBB ?

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 11

Two type of gametes will be produced: AB and aB.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 12

Which of the following statements indicates parallelism in genes and chromosomes ?
(i) They occur in pairs
(ii) They segregate during gamete formation
(iii) They show linkage
(iv) Independent pairs segregate independently

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 12

Walter Sutton and Theodor  Boveri in  1902. They discovered that behaviour of chromosomes was parallel to behaviour of genes. Chromosome and genes both occur in pair. The two alleles of a gene pair are located on homologous sites of homologous chromosomes.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 13

Which of the following amino acid substitution is responsible for causing sickle cell  anemia ?

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 13

Sickle cell anaemia involves mutation in a single base pair in the beta globin chain of haemoglobin pigment in the blood. Glutamic acid in short arm of chromosome II gets replaced with valine at the sixth position.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 14

In human beings, where genotype AABBCC represents dark skin colour, aabbcc represents light skin colour and AaBbCc represents intermediate skin colour; the pattern of genetic inheritance can be termed as :

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 14

In human beings, where genotype AABBCC represents dark skin colour, aabbcc represents light skin colour and AaBbCc represents intermediate skin colour; the pattern of genetic inheritance can be termed as polygenic and quantitative inheritance.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 15

Which of the following combination of chromosome numbers represents the correct sex determination pattern in honey bees ?

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 15

The female are diploid having 32 chromosomes and males are haploid i.e. having 16 numbers of chromosomes.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 16

Rajesh and Mahesh have defective haemoglobin due to genetic disorders. Rajesh has too few globin molecules while Mahesh has incorrectly functioning globin molecules. Identify the disorder they are suffering from:

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 16

Rajesh is suffering from thalassemia. Thalassemia is an autosomal recessive disorder of the red blood cells.  In Thalassemia one of the components of the haemoglobin molecule is inadequately produced or not produced at all. Mahesh, on the other hand is suffering from sickle cell anemia, which is an autosome linked recessive disorder. It is caused by point mutation in the beta-globin chain of haemoglobin pigment of the blood.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 17

Which of the following criteria must a molecule fulfil to act as a genetic material ?
(i) It should not be able to generate its replica.
(ii) It should chemically and structurally be stable.
(iii) It should not allow slow mutation.
(iv) It should be able to express itself in the form of Mendelian Characters.

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 17

A genetic material should

  • Be able to generate its replica (Replication).
  • Be chemically and structurally stable.
  • Provide the scope for slow changes (mutations) that are required for evolution.
  • Be able to express itself as ‘Mendelian Characters’.
Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 18

The promoter site and the terminator site for transcription are located at :

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 18

The promoter site and the terminator site for transcription are located at 5′ (upstream) end and 3′ (downstream) end, respectively of the transcription unit 

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 19

Which of the following is correct about mature RNA in eukaryotes ?

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 19

The primary transcript (hn RNA) contain both exons and introns and required to be processed before they become translationally active (mRNA). The introns are removed by a process called RNA processing or RNA splicing.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 20

In E.coli, the lac operon gets switched on when :

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 20

In presence of lactose (inducer), it binds with repressor protein and inactivates it. So repressor protein cannot bind to operator gene. The operator gene becomes free and induces the RNA polymerase to bind with promoter gene. Hence, three structural genes express their product and respective enzymes are produced. These enzymes act on lactose so that lactose is metabolized into glucose and Galactose.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 21

Oswald Avery, Colin MacLeod and Maclyn McCarty used enzymes to purify biochemicals such as proteins, DNA and RNA from the heat-killed S cells to see which ones could transform live R cells into S cells in Griffith's experiment. They observed that

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 21

Oswald Avery, Colin MacLeod and Maclyn McCarty. They worked to determine the biochemical nature of ‘transforming principle’ in Griffith’s experiment. They discovered that

  • DNA alone is transformed.
  • Proteases and RNases did not affect transformation.
  • Digestion with DNase inhibited transformation, suggesting that the DNA caused the transformation.
Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 22


AUG on the mRNA will result in the activation of which of the following RNA having correct combination of amino acids:

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 22

AUG is the initiation codon for methionine. So methionyl tRNA complex would have UAC at the Anticodon site.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 23

Short stretches of DNA used to identify complementary sequence in a sample are called

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 23

Short stretches of DNA used to identify complementary sequence in a sample are called probes.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 24

The structure of bilobed anther consists of

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 24

Anther is a sac-like structure that produces pollen grains. It is bilobed and each lobe has two theca i.e. dithecous.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 25

Direction: Consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

Assertion (A) : Chargaff rule is applicable to RNA.
Reason (R) : RNA contains deoxyribose sugar in them.

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 25

Lactational amenorrhea is a natural method of contraception and  involves the prevention of conception by breast feeding the child.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 26

Direction: Consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

Assertion (A) :  The mammary glands secrete milk for the nourishment of the young.
Reason (R) : These are modified sweat glands.

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 26

Saheli is a non-steroidal preparation used as oral contraceptive pills. It is a ‘once a week’ pill with very few side effects and high contraceptive value.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 27

Direction: Consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

Assertion (A) :  The primary sex organs are the structures that produce gametes.
Reason (R) : The primary sex organs located within the pelvic cavity and the secondary sex organs are the external genitalia.

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 27

Parturition is a neuroendocrine mechanism and is started by the signals from the developed foetus and the placenta. The signals originating from the foetus and placenta induce mild uterine contractions (fetal ejection reflex). This causes the release of oxytocin from maternal pituitary. Oxytocin causes stronger uterine muscle contractions which in turn stimulate further secretion of oxytocin. This process is continued leading to expulsion of the baby out of the uterus through the birth canal.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 28

Direction: Consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

Assertion (A) : Aminoacylation is an essential step for the synthesis of protein.
Reason  (R) : It is the process of adding an activated amino acid to the acceptor arm of a transfer RNA.

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 28

When two genes are located on the same chromosome, the proportion of parental gene combinations was much higher than the non-parental type. Morgan attributed this due to the physical association or linkage of the two genes and coined the term linkage.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 29

If the haploid number of chromosomes in a plant species is 20, how many chromosomes will be present in the cells of the shoot tip?

Detailed Solution for Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 29

Placenta is connected to the embryo by an umbilical cord. It transports substances to and from the embryo.

Test: Class 12 Biology: CBSE Sample Question Paper- Term I (2021-22) - Question 30

A criminal blew himself up in a local market when he was chased by cops. His face was beyond recognition. Suggest a modern technique that can help establish his identity.

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