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Class 10 Biology Sample Paper Solution - CBSE | 2022
1. The structure of bilobed anther consists of
A. 2 thecae, 2 sporangia
B. 4 thecae, 4 sporangia
C. 4 thecae, 2 sporangia
D. 2 thecae, 4 sporangia
2. In the figure of anatropous ovule given below, choose the correct option for the
characteristic distribution of cells within the typical embryo sac
Number of cells at chalazal end
Number of cells at micropylar end
Number of nuclei left in central cell
A
3
2
3
B
3
3
2
C
2
3
3
D
2
2
4
3. The coconut water from tender coconut is
A. cellular endosperm.
B. free nuclear endosperm.
C. both cellular and nuclear endosperm.
D. free nuclear embryo.
4. Pollen grains are well preserved as fossils because of presence of
A. sporopollenin
B. cellulose
C. lignocellulose
D. pectocellulose
5. 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
A. (i), (iii)
B. (ii), (iii)
C. (i), (iv)
D. (ii), (iv)
6. 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.
A. (i) and (iv)
B. (i), (ii) and (iv)
C. (iii) and (iv)
D. (ii), (iii) and (iv)
7. Figure A shows the front view of the human female reproductive system and Figure
Bshows 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:
X
Y
Z
A
Morula
Fertilized egg
Blastocyst
B
Unfertilized egg
Fertilized egg
Morula
C
Blastocyst
Fertilized egg
Unfertilized egg
D
Fertilized egg
Morula
Blastocyst
8. Penetration of the sperm in the ovum is followed by
A. formation of first polar body.
B. completion of meiosis II.
C. first meiosis.
D. dissolution of zona pellucida.
9. The correct sequence of hormone secretion from beginning of menstruation is
A. FSH, progesterone, estrogen.
B. estrogen, FSH, progesterone.
C. FSH, estrogen, progesterone.
D. estrogen, progesterone, FSH.
10. In the dioecious aquatic plant shown, identify the characteristics of the male flowers
that reach the female flowers for pollination:
Size of
the
flower
Colour of
flower
Characteristic feature of
pollengrain
A
small
brightly
coloured
Light weight and non-sticky
B
large
colourless
large and sticky
C
small
white
small, covered with mucilage
D
large
colourless
non sticky
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11. The thalamus contributes to the fruit formation in
A. banana.
B. orange.
C. strawberry.
D. guava.
12. How many types of gametes would be produced if the genotype of a parent is AaBB?
A. 1
B. 2
C. 3
D. 4
13. 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
A. (i) and (iii)
B. (ii) and (iii)
C. (i), (ii) and (iii)
D. (i), (ii) and (iv)
14. Which of the following amino acid substitution is responsible for causing sickle cell
anemia?
A. Valine is substituted by Glutamic acid in the α globin chain at the sixth position B. Valine is substituted by Glutamic acid in the β globin chain at seventh position C. Glutamic acid is substituted by Valine in the α globin chain at the sixth position D. Glutamic acid is substituted by Valine in the β globin chain at the sixth position
15. 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:
A. Pleiotropy and codominance
B. Pleiotropy and incomplete dominance
C. Polygenic and qualitative inheritance
D. Polygenic and quantitative inheritance
16. Which of the following combination of chromosome numbers represents the correct
sex determination pattern in honey bees?
A. Male 32, Female 16 B. Male 16, Female 32 C. Male 31, Female 32 D. Female 32, Male 31
17. 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.
Rajesh
Mahesh
A.
Sickle cell anaemia – an autosome linked recessive trait
Thalassemia – an autosome linked dominant trait
B.
Thalassemia – an autosome linked recessive blood disorder
Sickle cell anaemia – an autosome linked recessive trait
C.
Sickle cell anemia – an autosome linked recessive trait
Thalassemia – an autosome linked recessive blood disorder
D.
Thalassemia – an autosome linked recessive blood disorder
Sickle cell anaemia – an autosome linked dominant trait
18. 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
A. (i) and (ii)
B. (ii) and (iii)
C. (iii) and (iv)
D. (ii) and (iv)
19. The promoter site and the terminator site for transcription are located at
A. 3′ (downstream) end and 5′ (upstream) end, respectively of the transcription unit
B. 5′ (upstream) end and 3′ (downstream) end, respectively of the transcription unit
C. the 5′ (upstream) end of the transcription unit
D. the 3′ (downstream) end of the transcription unit
20. Which of the following is correct about mature RNA in eukaryotes?
A. Exons and introns do not appear in the mature RNA.
B. Exons appear, but introns do not appear in the mature RNA.
C. Introns appear, but exons do not appear in the mature RNA.
D. Both exons and introns appear in the mature RNA.
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21. In E.coli, the lac operon gets switched on when
A. lactose is present and it binds to the repressor.
B. repressor binds to operator.
C. RNA polymerase binds to the operator.
D. lactose is present and it binds to RNA polymerase.
22. 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
A. Proteases and RNases affected transformation.
B. DNase inhibited transformation.
C. Proteases and Lipases affected transformation.
D. RNases inhibited transformation.
23.
AUG on the mRNA will result in the activation of which of the following RNA having
correct combination of amino acids:
Site A
Site B
A
UAC
Methionine
B
Methionine
UAC
C
Methionine
AUG
D
AUG
Methionine
24. Short stretches of DNA used to identify complementary sequence in a sample
arecalled
A. probes
B. markers
C. VNTRs
D. primers
25. Assertion: Lactational amenorrhea is the natural method of contraception.
Reason: It increases the phagocytosis of sperm.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true and R is not the correct explanation of A
C. A is true but R is false
D. A is False but R is true
26. Assertion: Saheli, an oral contraceptive for females, contains a steroidal preparation.
Reason: It is a "once a week" pill with very few side effects
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true and R is not the correct explanation of A
C. A is true but R is false
D. A is False but R is true
27. Assertion: Parturition is induced by a complex neuro endocrine meachanism.
Reason: At the end of gestation period, the maternal pituitary releases prolactin which
causes uterine contractions.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true and R is not the correct explanation of A
C. A is true but R is false
D. A is False but R is true
28. Assertion: When the two genes in a dihybrid cross are situated on the same
chromosome, the proportion of parental gene combinations is much higher than nonparental type.
Reason: Higher parental gene combinations can be attributed to crossing over
between two genes.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true and R is not the correct explanation of A
C. A is true but R is false
D. A is False but R is true
29. Concentration of which of the following substances will decrease in the maternal blood
as it flows from embryo to placenta through the umbilical cord?
i. Oxygen
ii. Amino Acids
iii. Carbon dioxide
iv. Urea
A. i and ii
B. ii and iv
C. iii and iv
D. i and iv
30. In a fertilized ovule, n, 2n and 3n conditions occur respectively in
A. antipodal, zygote and endosperm
B. zygote, nucellus and endosperm
C. endosperm, nucellus and zygote.
D. antipodals, synergids and integusments
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31. A botanist studying Viola (common pansy) noticed that one of the two flower types
withered and developed no further due to some unfavorable condition, but the other
flower type on the same plant survived and it resulted in an assured seed set. Which
of the following will be correct?
A. The flower type which survived is Cleistogamous and it always exhibits autogamy
B. The flower type which survived is Chasmogamous and it always exhibits
geitonogamy.
C. The flower type which survived is Cleistogamous and it exhibits both autogamy
and geitonogamy.
D. The flower type which survived is Chasmogamous and it never exhibits autogamy.
32. During parturition, a pregnant woman is having prolonged labour pains and child birth
has to be fastened. It is advisable to administer a hormone that can
A. increase the metabolic rate.
B. release glucose in the blood.
C. stimulate the ovary.
D. activate smooth muscles.
33. A female undergoing IVF treatment has blocked fallopian tubes. The technique by
which the embryo with more than 8 blastomeres will be transferred into the female for
further development is
A. ZIFT
B. GIFT
C. IUT
D. AI
34. The mode of action of the copper ions in an IUD is to
A. increase the movement of sperms.
B. decrease the movement of the sperms.
C. make the uterus unsuitable for implantation.
D. make the cervix hostile to the sperms.
35. To produce 400 seeds, the number of meiotic divisions required will be
A. 400
B. 200
C. 500
D. 800
36. A cross is made between tall pea plants having green pods and dwarf pea plants
having yellow pods. In the F2 generation, out of 80 plants how many are likely to be
tallplants?
A. 15 B. 20 C. 45 D. 60
37. In Antirrhinum, RR is phenotypically red flowers, rr is white and Rr is pink. Select the
correct phenotypic ratio in F1 generation when a cross is performed between RR X Rr:
A. 1 red: 2 Pink: 1 white
B. 2 Pink: 1 white
C. 2 Red: 2 Pink
D. All Pink
38. What would be the genotype of the parents if the offspring have the phenotypes in 1:1
proportion?
A. Aa X Aa
B. AA X AA
C. Aa X AA
D. Aa x aa
39. What is the pattern of inheritance in the above pedigree chart?
A. Autosomal dominant
B. Autosomal recessive
C. Sex -linked dominant
D. Sex -linked recessive
40. A couple has two daughters. What is the probability that the third child will also be a
female?
A. 25%
B. 50%
C. 75%
D. 100%
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41. Genotypic ratio of 1:2:1 is obtained in a cross between
A. AB X AB
B. Ab X Ab
C. Ab X ab
D. ab X ab
42. Total number of nucleotide sequences of DNA that codes for a hormone is 1530. The
proportion of different bases in the sequence is found to be Adenine = 34%, Guanine
= 19%, Cytosine = 23%, Thymine = 19%.
Applying Chargaff’s rule, what conclusion can be drawn?
A. It is a double stranded circular DNA.
B. It is a single stranded DNA.
C. It is a double stranded linear DNA.
D. It is a single stranded DNA coiled on Histones.
43. A stretch of an euchromatin has 200 nucleosomes. How many bp will there be in the
stretch and what would be the length of the typical euchromatin?
A. 20,000 bp and 13,000 x10-9 m
B. 10,000 bp and 10,000 x10-9 m
C. 40,000 bp and 13,600 x10-9 m
D. 40,000 bp and 13,900 x10-9 m
44. Observe structures A and B given below. Which of the following statements are
correct?
A. A is having 2'-OH group which makes it less reactive and structurally stable,
whereas B is having 2'-H group which makes it more reactive and unstable.
B. A is having 2'-OH group which makes it more reactive and structurally unstable,
whereas B is having 2'-H group which makes it less reactive and structurally
stable.
C. A and B both have -OH groups which make it more reactive and structurally
stable.
D. A and B both are having -OH groups which make it less reactive and structurally
stable
45. If Meselson and Stahl's experiment is continued for sixth generations in bacteria, the
ratio of Heavy strands 15N/15N :Hybrid15N/14N : light 14N/14N containing DNA in the sixth
generation would be
A. 1:1:1
B. 0:1:7
C. 0:1:15
D. 0:1:31
46. Two important RNA processing events lead to specialized end sequences in most
human mRNAs:(i)at the 5’ end, and (ii) at the 3’ end. At the 5’end
the most distinctive specialized end nucleotide, (iii) is added and a sequence of
about 200 (iv) is added to the 3’ end.
A. (i) Initiator codon (ii) Promotor (iii) Terminator codon (iv) Release factors B. (i). Promotor (ii) Elongation (iii) Regulation (iv) Termination. C.(i) Capping (ii) Polyadenylation (iii) mGppp (iv) Poly(A). (iv) Poly(A). D. (i) Repressor (ii) Co repressor (iii) Operon (iv) sRelease factors
47. What are minisatellites?
A. 10-40 bp sized small sequences within the genes
B. Short coding repetitive region on the eukaryotic genome
C. Short non-coding repetitive sequence forming large portion of eukaryotic genome
D. Regions of coding strands of the DNA
48. There was a mix-up at the hospital after a fire accident in the nursery division. Which
of these children belong to the parents?
A. All of the children
B. Children 2, 3 & 6
C. Children 1 & 3
D. Children 2 & 4
To answer the questions, study the graphs below for Subject 1 and 2 showing different
levels of certain hormones.
49. The peak observed in Subject 1 and 2 is due to
A. estrogen
B. progesterone
C. luteinizing hormone
D. follicle stimulating hormone
50. Subject 2 has higher level of hormone B, which is
A. estrogen
B. progesterone
C. luteinizing hormone
D. follicle stimulating hormone
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51. If the peak of Hormone A does not appear in the study for Subject 1, which of the
following statement is true?
A. Peak of Hormone B will be observed at a higher point in the graph
B. Peak of Hormone B will be observed at a point lower than what is given in the
graph
C. There will be no observed data for Hormone B
D. The graph for Hormone B will be a sharp rise followed by a plateau
52. Which structure in the ovary will remain functional in subject 2?
A. Corpus Luteum
B. Tertiary follicle
C. Graafian follicle
D. Primary follicle
53. For subject 2 it is observed that the peak for hormone B has reached the plateau
stage. After approximately how much time will the curve for hormone B descend?
A. 28 days
B. 42 days
C. 180 days
D. 280 days
54. Which of the following statements is true about the subjects?
A. Subject 1 is pregnant
B. Subject 2 is pregnant
C. Both subject 1 and 2 are pregnant
D. Both subject 1 and 2 are not pregnant
55. The gene that controls the ABO blood group system in human beings has three alleles -`"I"^{"A"}` , `"I"^{"B"}` and i. A child has blood group O. His father has blood group A and mother has blood group B. Genotypes of other off springs can be:
i. `"I"^{"B"}``"I"^{"B"}` ii. `"I"^{"A"}`i iii. `"I"^{"B"}`i iv. `"I"^{"A"}``"I"^{"B"}` v. ii
A. i, ii, iii, v B. ii, iii ,iv, v C. iii, iv, v D. iv, iii, i
56. Placed below is a karyo type of a human being.
On the basis of this karyotype, which of the following conclusions can be drawn:
A. Normal human female
B. Person is suffering from Colour Blindness
C. Affected individual is a female with Down’s syndrome
D. Affected individual is a female with Turner’s syndrome
57. Given below is a dihybrid cross performed on Drosophila.
Which of the following conclusions can be drawn on the basis of this cross?
When yellow bodied (y), white eyed (w) Drosophila females were hybridized with
brown bodied (y+), red eyed males (w+) and F1 progenies were intercrossed, F2
generation would have shown the following ratio:
A. 1:2:1 because of linkage of genes
B. 9:3:3:1 because of recombination of genes
C. Deviation from 9:3:3:1 ratio because of segregation of genes
D. Deviation from 9:3:3:1 ratio because of linkage of genes
58. Which cellular process is shown below?
A. DNA Replication
B. Translation - Initiation
C. Translation - Elongation
D. Translation – Termination
59. Origin of replication of DNA in E. coli is shown below, Identify the labelled parts (i),(ii),
(iii) and (iv)
A. (i)- discontinuous synthesis , (ii)- continuous synthesis (iii) 3’ end (iv) 5’end
B. (i)- continuous synthesis , (ii)- discontinuous synthesis (iii) 5’ end (iv) 3’end
C. (i)- discontinuous synthesis, (ii)- continuous synthesis (iii) 5’ end (iv) 3’end
D. (i)- continuous synthesis , (ii)- discontinuous synthesis (iii) 3’ end (iv) 5’end
60. Transcription unit is represented in the diagram given below
Identify site (i), factor (ii) and Enzyme (iii) responsible for carrying out the process.
A. (i) Promoter Site, (ii) Rho factor (iii) RNA polymerase
B. (i) Terminator Site, (ii) Sigma factor (iii) RNA polymerase
C. (i) Promoter Site, (ii) Sigma factor (iii) RNA polymerase
D. (i) Promoter Site, (ii) Sigma factor (iii) DNA polymerase
