![\"MCQ](\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2022\/01\/MCQ-Questions.png?resize=159%2C13&ssl=1\")
<\/p>\nQuestion 1.<\/p>\n
(A) For every hormone there is a gene.
\n(B) For every protein there is a gene.
\n(C) For production of every enzyme there is a gene.
\n(D) For every molecule of fat there is a gene.
\nAnswer:
\n(D) For every molecule of fat there is a gene.<\/p>\n
Explanation:
\nHormone and enzymes are proteins and formation of any particular protein is controlled by a particular gene. Hence, all other options are correct.<\/p>\n
<\/p>\n
Question 2.<\/p>\n
(A) round and yellow.
\n(B) round and green.
\n(C) wrinkled and green.
\n(D) wrinkled and yellow.
\nAnswer:
\n(A) round and yellow.<\/p>\n
Explanation:
\nAs roundness and yellow colour are shown by capital letters in the genotype, so they are dominant traits. In FI generation, only dominant traits are expressed.<\/p>\n
Question 3.<\/p>\n
(A)the X chromosome in the zygote.
\n(B) the Y chromosome in zygote.
\n(C) the cytoplasm of germ cell which determines the sex.
\n(D) sex is determined by chance.
\nAnswer:
\n(B) the Y chromosome in zygote.<\/p>\n
Explanation:
\nY-chromosome in zygote means that the zygote would develop into a male I j child.<\/p>\n
Question 4.<\/p>\n
(A) boy.
\n(B) girl.
\n(C) X- chromosome does not determine the sex of a child.
\n(D) either boy or girl.
\nAnswer:
\n(B) girl.<\/p>\n
Explanation:
\nA zygote with XX chromosomes in the 23rd pair would develop into a girl child.<\/p>\n
<\/p>\n
Question 5.<\/p>\n
(A) colour of eye.
\n(B) colour of skin.
\n(C) size of body.
\n(D) nature of hair.
\nAnswer:
\n(C) size of body.<\/p>\n
Explanation:
\nTraits in other options are always inheritable traits.<\/p>\n
Question 6.<\/p>\n
(A) double fertilisation.
\n(B) self-pollination.
\n(C) cross fertilisation.
\n(D) no fertilization.
\nAnswer:
\n(C) cross fertilisation.<\/p>\n
Explanation:
\nAs it is mentioned in the question that two pink coloured flowers were crossed, thus it is cross fertilization.<\/p>\n
Question 7.<\/p>\n
(A) tallness is the dominant trait.
\n(B) shortness is the dominant trait.
\n(C) tallness is the recessive trait.
\n(D) height of pea plant is not governed by gene’T’ oi’t’.
\nAnswer:
\n(A) tallness is the dominant trait.<\/p>\n
Explanation:
\nThis is a case of monohybrid cross, in which all the progenies in the FI generation show dominant character. Hence, tallness is the dominant trait.<\/p>\n
Question 8.<\/p>\n
(A) one.
\n(B) two.
\n(C) three.
\n(D) four.
\nAnswer:
\n(A) one.<\/p>\n
Explanation:
\nThe sex chromosomes are in the 23rd pair.<\/p>\n
Question 9.<\/p>\n
(A) a Chinese school-boy.
\n(B) a chimpanzee.
\n(C) a spider.
\n(D) a bacterium.
\nAnswer:
\n(A) a Chinese school-boy.<\/p>\n
Explanation:
\nIn evolutionary terms, we have more in common with a Chinese school boy as both are humans and belong to same species.<\/p>\n
<\/p>\n
Question 10.<\/p>\n
(A) Mendel
\n(B) Darwin
\n(C) Morgan
\n(D) Lamarck
\nAnswer:
\n(B) Darwin<\/p>\n
Explanation:
\nThe theory of evolution of species by natural selection was given by Charles Darwin.<\/p>\n
Question 11.<\/p>\n
(A) Mendel
\n(B) Darwin
\n(C) Morgan
\n(D) Lamarck
\nAnswer:
\n(D) Lamarck<\/p>\n
Explanation:
\nThe theory of inheritance of acquired characters was given by Lamarck.<\/p>\n
Question 12.<\/p>\n
(A) the extinction of organism has occurred recently.
\n(B) the extinction of organism has occurred thousands of years ago.
\n(C) the fossil position in the layers of earth is not related to its time of extinction.
\n(D) time of extinction cannot be determined.
\nAnswer:
\n(B) the extinction of organism has occurred thousands of years ago.<\/p>\n
Explanation:
\nNewer fossils are deposited in layers above older fossils.<\/p>\n
Assertion and Reason Based MCQs<\/span><\/p>\n Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as. Question 1.<\/p>\n Answer: Explanation: The gene for violet flowers is dominant over the gene for white flowers so that only the violet gene is expressed as violet flowers in the first generation.<\/p>\n Question 2.<\/p>\n Answer: Explanation: Question 3.<\/p>\n Answer: Explanation: Question 4.<\/p>\n Answer: Explanation: Question 5.<\/p>\n Answer: Explanation: Question 6.<\/p>\n Answer: Explanation: Question 7.<\/p>\n Answer: Explanation: Question 8.<\/p>\n Answer: Explanation: Question 9.<\/p>\n Answer: Explanation: Case-Based MCQs<\/span><\/p>\n Attempt any 4 sub-parts from each question. Each sub-part carries 1 mark.<\/p>\n I. Read the passage and answer the following questions from Question 1. to Question 5. Question 1.<\/p>\n (A) Monohybrid cross Explanation: Question 2.<\/p>\n (A) 25% Explanation: Question 3.<\/p>\n (A) WW Explanation: Question 4.<\/p>\n (A) 3:1 Explanation: II. Study the given cross showing self pollination in F1<\/sub> and answer the following questions from Question 1. to Question 4. Question 1.<\/p>\n (A) RrYy Explanation: Question 2.<\/p>\n (A) Round Yellow: Round Green: Wrinkled Yellow: Wrinkled Green Explanation: Question 3.<\/p>\n (A) 3: 1 Explanation: Question 4.<\/span><\/p>\n (A) TTWW Explanation: III. Read the given passage and answer any of the four questions from Question 1. to Question 5. given below: Question 1.<\/p>\n (A) Round -yellow Explanation: Question 2.<\/p>\n (A) dominant Explanation: Question 3.<\/p>\n (A) Round green and wrinkled yellow respectively Explanation: Question 4.<\/p>\n (A) A-B Explanation: Question 5.<\/p>\n (A) Monohybrid cross Explanation: Heredity and Evolution Class 10 MCQ Questions With Answers Question 1. Which of the following statement is incorrect? (A) For every hormone there is a gene. (B) For every protein there is a gene. (C) For production of every enzyme there is a gene. (D) For every molecule of fat there is a gene. Answer: …<\/p>\n
\n(A) Both A and R are true and R is the correct explanation of A.
\n(B) Both A and R are true but R is NOT the correct explanation of A.
\n(C) A is true but R is false.
\n(D) A is false and R is true.<\/p>\nAssertion: A geneticist crossed a pea plant having violet flowers with a pea plant having white flowers, he got all violet flowers in first generation. Reason: White colour gene is not passed on to next generation.<\/h2>\n
\n(C) A is true but R is false.<\/p>\n<\/p>\nAssertion (A): Mendel chose a number of varieties of garden pea as plant material for his experiments.
\nReason (R): Garden pea has well defined characters and is bisexual.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nMendel chose garden pea as plant material for his experiment because garden pea plants were easily available they grow in one season fertilization was easy.<\/p>\nAssertion (A): In humans, males play an important role in determining the sex of the child.
\nReason (R): Males have two X chromosomes.<\/h2>\n
\n(C) A is true but R is false.<\/p>\n
\nSex of a child is dependent on the type of the male gamete that fuses with the female gamete. Human beings possess 23 pairs of chromosomes. Out of these, 22 pairs are known as autosomes, while the remaining one pair comprises sex chromosomes (XX in females and XY in males). At the time of fertilisation, the egg cell fuses with the sperm cell, resulting in the formation of the zygote. If the egg cell carrying an X chromosome fuses with the sperm carrying an X chromosome, the resulting child would be a girl. If the egg cell carrying an X chromosome fuses with the sperm carrying a Y chromosome, the resulting child would be a boy.<\/p>\nAssertion (A): Learning a skill such as dance and music is an acquired trait.
\nReason (R): Acquired traits develop in the life time of an individual and do not pass to the progeny.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nTrails which develop in the life time of an individual and do not pass to the progeny are called acquired traits. Learning a skill such as dance\/music\/loss of body parts\/’ weight etc are example of acquired traits.<\/p>\nAssertion (A): Traits like eye colour or height are inherited traits.
\nReason (R): Inherited traits are not transferred from parents to young ones.<\/h2>\n
\n(C) A is true but R is false.<\/p>\n
\nEye colour and height are genetically inherited traits, as these are expressed by genes. Inherited traits are the traits which are transferred from parents to young ones. Acquired traits are the characters that are acquired by the individual during its lifetime. These traits cannot be inherited. For example, if a wrestler develops large muscles due to his training program that does not mean it will be passed on to his offspring.<\/p>\nAssertion (A): Fossils are remains of dead organisms.
\nReason (R): It is helpful in study of evolution.<\/h2>\n
\n(B) Both A and R are true but R is NOT the correct explanation of A.<\/p>\n
\nFossils are remains of hard parts of the dead organisms in the strata of earth. It help in tracing evolutionary pathways.<\/p>\nAssertion (A): Wings of butterfly and wings of bat are analogous orgAnswer:
\nReason (R): Analogous organs have different origin and structural plan but same function.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nWings of butterfly and wings of bat though they perform similar function, they have different origin\/basic structure. Hence, they are known as analogous orgAnswer:<\/p>\n<\/p>\nAssertion (A): Speciation is the process of formation of a new species from a pre-existing one.
\nReason (R): Mutation plays a role in speciation.<\/h2>\n
\nOption (A) is correct.<\/span><\/p>\n
\nSpeciation is an evolutionary process by which new species arise. One of the factors that lead to speciation is mutation.<\/p>\nAssertion (A): Natural selection is the phenomenon by which the nature selects those species which possess survival advantage over the other species.
\nReason (R): According to theory of natural selection, there is struggle of existence within the species of a population for the environmental resources and their struggle leads to survival of certain organisms and elimination of the less competent species.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nNatural selection is the phenomenon by which the nature selects those species which possess survival advantage over the other species. According to theory of natural selection, there is struggle of existence within the species of a population for the environmental resources and their struggle leads to survival of certain organisms and elimination of the less competent species.<\/p>\n
\nIn a cross between plants with purple flowers and plants with white flowers, the offspring of Fj generation all had white flowers. When the Fj generation was self-crossed, it was observed in the F2 generation that out of 100, 75 flowers were white. Make a cross and answer the following questions:<\/p>\n![\"MCQ](\"https:\/\/i2.wp.com\/mcq-questions.com\/wp-content\/uploads\/2022\/01\/MCQ-Questions-for-Class-10-Science-Chapter-9-Heredity-and-Evolution-1.png?resize=342%2C112&ssl=1\")
<\/p>\nThe above cross is known as:<\/h2>\n
\n(B) Dihybrid cross
\n(C) Test cross
\n(D) Back cross
\nAnswer:
\n(A) Monohybrid cross<\/p>\n
\nA cross between two plants, which differ in only one pair of contrasting characters is calld monohybrid cross. In this cross, F2 phenotypic ratio is 3 :1 and genotypic ratio is 1: 2 :1.<\/p>\nIn a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1<\/sub> generation is ?<\/h2>\n
\n(B) 50%
\n(C) 75%
\n(D) 100%
\nAnswer:
\n(B) 50%<\/p>\n
\nIn a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F, generation is 50 %.<\/p>\n<\/p>\nWhich of these is not the genotype of F progeny?<\/h2>\n
\n(B) Ww
\n(C) ww
\n(D) Wp
\nAnswer:
\n(D) Wp<\/p>\n
\nGenotypes of F2<\/sub> progeny are WW, Ww, ww.<\/p>\nThe ratio of ‘White: Purple’ flowers in the F2<\/sub> generation is<\/h2>\n
\n(B) 1: 2
\n(C) 1 : 3
\n(D) 2 :1
\nAnswer:
\n(A) 3:1<\/p>\n
\nRatio between White : Purple flowers are 3:1.<\/p>\n
\n![\"MCQ](\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2022\/01\/MCQ-Questions-for-Class-10-Science-Chapter-9-Heredity-and-Evolution-2.png?resize=344%2C84&ssl=1\")
<\/p>\nThe missing blank in the above cross is:<\/h2>\n
\n(B) RRYY
\n(C) RryY
\n(D) rryy
\nAnswer:
\n(A) RrYy<\/p>\n
\nRrYy (Round Yellow) is the I missing blank in the above cross.<\/p>\nThe combination of characters in the F2<\/sub> progeny are:<\/h2>\n
\n(B) Round Green : Round Yellow : Wrinkled yellow : Wrinkled Green
\n(C) Round Yellow : Round Green : Wrinkled Green: Wrinkled yellow
\n(D) Round Green : Round Yellow : Wrinkled yellow : Wrinkled Green
\nAnswer:
\n(A) Round Yellow: Round Green: Wrinkled Yellow: Wrinkled Green<\/p>\n
\nIn F2<\/sub> generation, the combination of characters is Round Yellow: Round Green: Wrinkled yellow: Wrinkled Green.<\/p>\nThe ratio of the combination of characters in the F2<\/sub> progeny is:<\/h2>\n
\n(B) 1: 2: 1
\n(C) 1\u00a0 1: 1
\n(D) 9 : 3 : 3 :1
\nAnswer:
\n(D) 9 : 3 : 3 :1<\/p>\n
\nThe ratio of the combination of 8 characters in the F2<\/sub> progeny is 9: 3: 3:1.<\/p>\n<\/p>\nA Mendelian experiment consists of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent cod depicted as<\/h2>\n
\n(B) TTww
\n(C) TtWW
\n(D) TtWw
\nAnswer:
\n(C) TtWW<\/p>\n
\nAll progeny bore violet flower, so they all must have gene for violet flower. As violet colour appears in hybrids thus it must be the dominant character. So, white flowered plant should have ww genes to show recessive white character. It indicates that all progenies got allele W (violet colour) from tall-violet flowered plant, thus its all gametes should have this allele. To serve the purpose plant must have WW genes. But, tallness was found in 50% progenies thus half of its gametes contained T gene and other half contained t gene. Inclusively, the tall plant had TtWW genotype.<\/p>\n
\nSeema crossed pure breed pea plants having round-yellow seeds with wrinkled green seeds and found that only A-B type of seeds were produced in the F, generation. When F, generation pea plants having A-B type of seeds were cross-breed by self pollination, then in addition to the original round yellow and wrinkled green seeds, two new varieties A-D and C-B types of seeds were also obtained.<\/p>\nWhat are A-B type of seeds?<\/h2>\n
\n(B) Round- green
\n(C) Wrinkled-yellow
\n(D) Wrinkled-green
\nAnswer:
\n(A) Round -yellow<\/p>\n
\nA-B type of seeds are round in shape and yellow in colour.<\/p>\nA and B are……… traits.<\/h2>\n
\n(B) recessive
\nAnswer:
\n(A) dominant<\/p>\n
\nA-B type is dominant traits.<\/p>\nA-D are……… and C-B are ……….. type of seeds.<\/h2>\n
\n(B) Round yellow and wrinkled green respectively
\n(C) Wrinkled green and round green respectively
\n(D) Wrinkled green and round yellow respectively
\nAnswer:
\n(A) Round green and wrinkled yellow respectively<\/p>\n
\nA-D is round-green while C-B is wrinkled- yellow.<\/p>\n<\/p>\nWhich one of these will be produced in minimum and maximum number in the F2<\/sub> generation?<\/h2>\n
\n(B) A-D
\nAnswer:
\n(A) A-B<\/p>\n
\nA-B is produced in maximum number while A-D will be produced in minimum number.<\/p>\n<\/p>\nThe above cross is known as<\/h2>\n
\n(B) Dihybrid cross
\n(C) Test cross
\n(D) Back cross
\nAnswer:
\n(B) Dihybrid cross<\/p>\n
\nA cross between two plants, which differ in two pairs of contrasting characters are called dihybrid cross.<\/p>\nMCQ Questions for Class 10 Science with Answers<\/a><\/h4>\n","protected":false},"excerpt":{"rendered":"