CBSE Class 10 Biology Heredity and Evolution Worksheet Set B

Read and download free pdf of CBSE Class 10 Biology Heredity and Evolution Worksheet Set B. Download printable Science Class 10 Worksheets in pdf format, CBSE Class 10 Science Chapter 9 Heredity And Evolution Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Science Class 10 Assignments and practice them daily to get better marks in tests and exams for Class 10. Free chapter wise worksheets with answers have been designed by Class 10 teachers as per latest examination pattern

Chapter 9 Heredity And Evolution Science Worksheet for Class 10

Class 10 Science students should refer to the following printable worksheet in Pdf in Class 10. This test paper with questions and solutions for Class 10 Science will be very useful for tests and exams and help you to score better marks

Class 10 Science Chapter 9 Heredity And Evolution Worksheet Pdf

Practice Worksheet
CBSE Class 10 Biology
Topic: Heredity and Evolution 
 
MCQ Questions for NCERT Class 10 Science Heredity and Evolution


Question. If a round, green seeded pea-plant (RRyy) is crossed with a wrinkled yellow seeded pea- plant (rrYY), the seeds produced in F1 generation are
(a) round and green
(b) round and yellow
(c) wrinkled and green
(d) wrinkled and yellow

Answer : B

Question. Pure-bred pea plant A is crossed with pure¬bred pea plant B. It is found that the plants which look like A do not appear in Fj gene¬ration but re-emerge in F2 generation. Which of the plants A and B are tall and dwarf?
(a) A are tall and B are dwarf.
(b) A are tall and B are also tall.
(c) A are dwarf and B are also dwarf
(d) A are dwarf and B are tall

Answer : D

Question. The maleness of a child is determined by
(a) the X chromosome in the zygote
(b) the Y chromosome in zygote
(c) the cytoplasm of germ cell which determines the sex
(d) sex is determined by chance

Answer : B

Question. The human species has genetic roots in
(a) Australia
(b) Africa
(c) America
(d) Indonesia

Answer : B

Question. A cross between a tall pea-plant (TT) and a short pea-plant (tt) resulted in progenies that were all tall plants because
(a) tallness is the recessive trait.
(b) shortness is the dominant trait.
(c) height of pea-plant is not governed by gene T or t.
(d) tallness is the dominant trait.

Answer : B

Question. Which of the following is an example of genetic variation?
(a) One person has a scar, but his friend does not.
(b) One person is older than another.
(c) Reeta eats meat, but her sister Geeta is a vegetarian.
(d) Two children have different eye colours.

Answer : D

Question. The process of evolution of a species whereby characteristics which help individual organisms to survive and reproduce are passed on to their offspring and those characteristics which do not help are not passed on is called
(a) Artificial selection
(b) Speciation
(c) Hybridization
(d) Natural selection

Answer : D

Question. Differences between organisms in a species are described as variation. Which of the following would you describe as continuous variation?
(a) Hair colour
(b) Eye colour
(c) Weight
(d) Sex

Answer : C

Question. Which of the following characters can be acquired but not inherited?
(a) Colour of skin
(b) Size of body
(c) Colour of eyes
(d) Texture of hair

Answer : B

Question. Natural selection is called ‘survival of the fittest’. Which of the following statements best describes an organism?
(a) How strong it is compared to other individuals of the same species.
(b) How much food and resources it is able to gather for its offspring.
(c) The ability to adapt to the environment in the niche it occupies.
(d) The number of fertiie offspring it has.

Answer : C

Question. The fossil remains of Archaeopteryx is a connecting link between
(a) reptiles and mammals
(b) reptiles and bird
(c) fish and amphibian
(d) amphibian and reptile

Answer : B

Question. A zygote which has an X-chromosome inherited from the father will develop into a
(a) girl
(b) boy
(c) either boy or girl
(d) X-chromosome does not influence the sex of a child.

Answer : A

Question. Identify the two organisms which are now extinct and are studied from their fossils.
(a) white tiger and sparrow
(b) dinosaur and fish (Knightia)
(c) ammonite and white tiger
(d) trilobite and white tiger

Answer : B

Question. The more characteristics two species have in common :
(a) More closely they are related and more recently they had a common ancestors.
(b) More distantly they are related and more recently they have common ancestors.
(c) More closely they are related and more distantly they have common ancestors.
(d) More distantly they are related and more distantly they have common ancestors.

Answer : A


(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.

Question. Assertion: Acquired trait cannot be passed on from one generation to next generation.
Reason: Inaccuracy during DNA copying of acquired trait is minimum.

Answer: C

Question. Assertion: Human, frog and bird have a common ancestor.
Reason: Limbs of human, bird and frog are homologous.

Answer : A

Question. Assertion: Speciation is the reproductive isolation amongst once interbreeding population.
Reason: Genetic drift, Natural selection and Severe DNA change can cause speciation.

Answer : A

Question. Assertion: When pure breed tall plants are crossed with pure breed short plants, all the plants in F1 progeny are tall. When the tall plants of F1 progeny are crossed, short plants re-appear in F2 progeny.
Reason: Traits are independently inherited.

Answer : A

Question. Assertion: Variation is high in sexually reproducing organisms compared to asexually reproducing organisms.
Reason: Inaccuracies during DN A copying give rise to variation.

Answer : B

Fill in the Blanks :

Question. If a sperm carrying ‘X’ chromosome fertilises an ovum, then the child bom will be a ……….. .
Answer: girl

Question. The cut tail of an mice is an ____________ trait.
Answer: acquired

Question. In Mendel’s experiment, the trait which did not appear in the F1 generation was said to be …………. .
Answer: recessive

Question. The number of paift(s) of sex chromosomes in the zygote of humans is ____________ .
Answer: one

Question. The process by which new species develop from the existing species is known as ……….. .
Answer: speciation

Question. involution led to tne tormation or a new ____________ .
Answer: species

Question. Transitional fossils like ……….. is a connecting link between reptiles and birds.
Answer: Archaeopteryx

Question. The wings of a bird and mosquito are ……….. organs.
Answer: analogous

Question. Chromosomes are thread like structures in the nucleus of a cell formed of DNA which carriers the ____________ .
Answer: genes


Important Questions for NCERT Class 10 Science Heredity and Evolution


Very Short Answer :
 
Question. Who proposed the theory of origin of life on the earth? 
Answer : J.B.S.Haldane proposed the theory of origin of life on earth.

Question. What is evolution?
Answer : Formation of new species due to gradual change over a long period of time.

Question. Explain the term analogous with examples.
Answer : Analogous organs are those organs which have different basic structural designs and developmental origins but have similar appearance and perform similar functions.
Examples: Wings of an insect and wings of a bat.

Question. Will geographical isolation be a major factor in speciation of sexually reproducing animals? How?
Answer : Yes, because it interrupts the flow of genes between their isolated populations through the gametes.

Question. What do you mean by speciation?
Answer : Evolution of reproductive isolation among once interbreeding population.

Question. Explain the term homologous with examples.
Answer : Homologous organs are those organs which have the same basic structural design and developmental origin but have different functions and appearance.
Examples: Forelimbs of frog and forelimbs of human.

Question. The human hand, cat paw and the horse foot, when studied in detail show the same structure of bones and point towards a common origin.
(i) What do you conclude from this?
(ii) What is the term given to such structures?
Answer : (i) In course of evolutions they have been modified to perform different functions.
(ii) Homologous organs.

Question. Name the scientist who said life originated from inanimate matter.
Answer : J.R.S. Haldane.

Question. Is it necessary that homologous structures always have a common ancestor?
Answer : Yes, it is necessary that homologous structures always have a common ancestor in order to carry out the different activities. Otherwise there cannot be any similarity in basic plan, internal structure, development or origin.

Question. Both birds and bat have wings. What name is given to this relationship?
Answer : Analogous organs.

Question. Why variations are more in human beings?
Answer : Because human being reproduce sexually and variation are more in sexually reproducing organisms.

Question. Give as example where sex determination is regulated hy invironmental factors.
Answer : In snail, sex is determined by environmental factors such as temperature.

Question. What do you mean by the synthetic theory of evolution? 
Answer : The synthetic theory of evolution in which the origin of species is based on the interaction of genetic variation and natural selection.
 
Question. Who gave the concept of evolution? 
Answer : Charles Darwin gave the concept of evolution.
 
Question. What is species? 
Answer : A species can be defined as a group of similar organisms that can interbreed and produce fertile off springs.
 
Question. Define fossils?
Answer : The remains of the dead animals and plants that lived in the remote past are called fossils.
 

Short Answer Type Questions :

Question. Study carefully the given flowchart depicting cross between pea plant with yellow seeds and pea plant with green seeds and answer the following:
(i) What kind of cross it depicts?
(ii) In which proportions the characters will appear in F1 and F2 generation? 
CBSE Class 10 Biology Heredity and Evolution Worksheet Set B

Answer: (i) It depicts monohybrid cross.
(ii) In F1 generation all pea plants with yellow seeds will be produced whereas in F2 generation pea plants with yellow and green seeds in the ratio 3:1 will be produced.
CBSE Class 10 Biology Heredity and Evolution Worksheet Set B

Question. List two differences in tabular form between dominant traits and recessive traits.
Answer: Dominant traits
It expresses itself with or without the presence of recessive trait.
For example: tall plant, round seed, violet flower etc. are dominant traits in a pea plant.
Recessive traits
It is able to express itself only in the absence of dominant trait
Dwarf plant, wrinkled seed, white flower, etc. are recessive traits in a pea plant.

Question. (a) On what rules inheritance is based?
(b) Is each trait influenced by both parental and maternal DNA?
Answer: (a) (i) Law of dominance. (ii) Law of segregation (iii) Law of independent assortment
(b) Yes, each trait is influenced by DNA of both parents

Question. The chromosomal number of the sexually producing parents and their offspring is the same. Justify this statement.
Answer: Offspring always takes 23 chromosomes from father and 23 chromosomes from mother and in total has 46 chromosomes. It means that total number of chromosomes remain constant.

Question. If YYRR is round yellow, what do the following represent?
yyrr yyRR
Answer: yyrr – wrinkled, green seeds
yyRR – Round, green seeds.

Question. How do Mendel’s experiments show that traits may be dominant or recessive?
Answer: • Mendel selected pure breed of tall (TT) and short (tt) pea plants.
• He crossed these plants and carefully produced seeds. This is called F1 generation.
• All the plants in F1 generation were tall, showing that tallness is dominant trait.
• Now these plants were self pollinated.
• In the F2 generation, 3 out of 4 plants, i.e. 75% were tall and one out of four, i.e. 25% were short plants. It shows that shortness is the recessive trait.

Question. A cross was carried out between pure breed tall pea plant with pure dwarf pea plant and F1 progeny was obtained. Later, F1, progeny was selfed to obtain F2 progeny. Answer the following questions:
(a) What is the phenotype of the F1 progeny and why?
(b) Give the phenotypic ratio of the F2 progeny.
(c) Why is F2 progeny different from the F1 progeny?
Answer: (a) Tall because it is a dominant trait whereas dwarf is a recessive trait.
(b) 3 : 1 is ratio between tall to dwarf.
(c) In F2 generation, recessive genes are also expressed in homozygous condition

Question. What is F2 generation?
Answer: The generation produced by the offsprings of F1 generation is called F2 or second generation.

Question. Why are small number of surviving tigers a cause of worry from genetics point of view?
Answer: (i) Tigers may get extinct in near future due to natural calamities, lack of available food and due to their small number.
(ii) Cross breeding may be less possible. Variations will not occur, which is essential for the survival.
(iii) Adaptation due to changing environment, like cutting of forests, global warming becomes difficult.
(iv) Protection from enemies is easy if they are more in number.

Question. A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything whether the light eye colour trait is dominant or recessive? Why or why not?
Answer: We cannot predict because information is not sufficient. We can decide dominant or recessive trait if we have the data for at least three generations. More information is required.

Question. How can variation occur in asexually reproducing organisms?
Answer: There would be only very minor differences in asexual reproduction, generated due to small inaccuracies in DNA copying.
Unlike sexual reproduction, asexual reproduction only introduces genetic variation into the population if a random mutation in the organism's DNA is passed on to the offspring.

Question. Answer the following:
(i) Who are more closely related— A brother and sister or two cousins? Why?
(ii) Why do all the gametes formed in human females have an Xchromosome ?
Answer: (i) A brother and sister are more closely related than two cousins as they have a common ancestor.
(ii) The sex chromosome in human female is homomorphic i.e., they contain same chromosome XX. During meiosis process at the time of gamete formation all egg cell will get one copy of X chromosome, hence all the gametes formed in human females have an X chromosome.

Question. How is the equal genetic contribution of male and female parents ensured in the Progeny? 
Answer: Human beings contain 23 pairs of chromosomes-22 pairs are autosomes and one pair sex chromosomes. During meiosis process gametes are formed in sex cells where the chromosome number is halved (n). At the time of fertilisation when male gamete fuses with female gamete the diploid number (2n) is restored back in zygote. Thus half of the chromosomes come from father and other half from mother. In this way meiosis process ensured equal genetic contribution of male and female parents in the progeny.

Question. Why do all the gametes formed in human females have an X chromosome?
Answer: The sex chromosome in human female is homomorphic i.e., they contain same chromo-some XX. During meiosis process at the time of gamete formation all egg cells will get one copy of X chromosome, hence all the gametes formed in human females have an X chromosome.

Question. If a trait A exists in 10% of a population of an asexually reproducing species and trait B exists in 60% of the same population, which trait is likely to have arisen earlier? 
Answer: Trait B would have arisen earlier than trait A because as species are asexually reproducing, there would be very minor differences generated due to small inaccuracies in DNA copying which results in variations in trait A. But as trait B occurs in more number in the population as compared to trait A so Trait B would have arisen earlier than trait A.

Question. Difference between Recessive and Dominant Traits
Answer: 

CBSE Class 10 Biology Heredity and Evolution Worksheet Set B

Question. Characteristics in an individual organism are caused by both genetic and environmental variation. Complete the table below stating whether the characteristic is genetic or environmental variation.
CBSE Class 10 Biology Heredity and Evolution Worksheet Set B

Answer: 

CBSE Class 10 Biology Heredity and Evolution Worksheet Set B

Question. In the given figure below, what experiment
would we do to confirm that the F2 generation did in fact have a 1 : 2 : 1 ratio of TT, Tt and trait combinations ? 
CBSE Class 10 Biology Heredity and Evolution Worksheet Set B
CBSE Class 10 Biology Heredity and Evolution Worksheet Set B

Answer: When a pure tall pea plant (TT) was crossed with pure short pea plant (tt) then in F1 generation all hybrid tall pea plants were produced. (Tt) Again pea plants of F1 were selfed where pure tall (TT), hybrid tall (Tt) and pure short (tt) pea plants were obtained in the ratio 1 : 2 : 1 were obtained. 

CBSE Class 10 Biology Heredity and Evolution Worksheet Set B

Question. A study found that children with light coloured eyes are likely to have parents with light-coloured eyes. On this basis can we say anything about whether the light eye colour trait is dominant or 
recessive? Why or why not? 
Answer: No, we cannot say whether the light eye colour trait is dominant or recessive as the child inherits one copy of the trait from father and other from mother and here nature of the trait is not known. The nature can be known from at least three generations but here data is given only for two generations i.e., parents [P] and offsprings [F1].

Cased Based Questions :

Read the passage carefully and answer the following questions from Heredity is the passing on of some specific characteristics from one generation to the next, from parent to offspring. The study of heredity is called genetics. The traits are passed on by genes in our DNA. A gene gives instructions about making a certain protein to determine a trait for the person like the colour of eyes or hair. The genes are located inside a DNA molecule which is a material found in chromosomes. Genes may be dominant or recessive.

Question. The factor which expresses in homozygous and heterozygous states is called _______. 
(a) dominant
(b) recessive
(c) gene
(d) allele

Answer: A

Question. The study of the pattern of chromosomes from parents to the of fspringiscal le d: 
(a) Evolution
(b) Genetics
(c) Offspring analysis
(d) Genetical analysis

Answer: B

Question. In Mendel’s experiment, the trait which did not appear in the F1 generation was: 
(a) dominant
(b) recessive
(b) recession
(d) allele

Answer: B

Question. What was the model organism used by Mendel to give the laws of inheritance? 
(a) Garden peas
(b) Wild peas
(b) Basket peas
(d) Bottle gourd

Answer: A

Question. A zygote which has an X-chromosome inherited from the father will develop into a: 
(a) girl.
(b) boy.
(c) either boy or girl.
(d) X-chromosome does not influence the sex of a child.

Answer: A

Read the passage carefully and answer the following questions from The study of heredity is called genetics. Traits are characteristics such as hair colour, eye colour, artistic or athletic ability, height, and more. Every living organism, plant, or animal, receives its characteristics or traits from its parents. In plants these traits may include seed colour, flower position, length of stem, and much more. The first person to discover this passing of traits was a scientist named Gregor Mendel. He is considered as the father of genetics. He studied pea plants and discovered that certain traits were passed on, or inherited from parent to offspring.

Question. If a round, green seeded pea plant (RRyy) is crossed with a wrinkled yellow seeded pea plant (rrYY), the seeds produced in F1 generation are: 
(a) round and green
(b) round and yellow
(c) wrinkled and green
(d) wrinkled and yellow

Answer: B

Question. A cross between two individuals results in a ratio of 9: 3: 3:1 for four possible phenotypes of progeny. This is an example of a: 
(a) Monohybrid cross
(b) Dihybrid cross
(c) Test cross
(d) F1 generation

Answer: B 

Question. A man with blood group A marries a woman having blood group O. What will be the blood group of the child? 
(a) O only
(b) A only
(c) AB
(d) Equal chance of acquiring blood group A or blood group O

Answer: D

Question. Pure-breed pea plant A is crossed with pure-breed pea plant B. It is found that the plants which look like A do not appear in F1 generation but re-emerge in F2 generation. Which of the plants A and B are tall and dwarf? 
(a) A are tall and B are dwarf.
(b) A are tall and B are also tall.
(c) A are dwarf and B are also dwarf.
(d) A are dwarf and B are tall.

Answer: D

Question. In humans if gene B gives brown eyes and gene b gives blue eyes, what will be the colour of eyes of the persons having combinations? 
(i) Bb and (ii) BB
(a) (i) Blue and (ii) Brown
(b) (i) Brown and (ii) Blue
(b) (i) Brown and (ii) Brown
(d) (i) Blue and (ii) Blue

Answer: C

Read the following and answer the following questions from Gregor Johann Mendel is known as a “Father of modern genetics” for his work in the field of genetics. He gave three laws of inheritance followed as Law of dominance, Law of segregation and Law of independent assortment. He conducted his experiment on garden pea plants having contrasting characteristics. He performed selfpollination and cross-pollination to understand the inheritance patterns of traits.

Question. The maleness of a child is determined by: 
(a) the X-chromosome in the zygote.
(b) the Y-chromosome in zygote.
(c) the cytoplasm of germ cell which determines the sex.
(d) sex is determined by chance.

Answer: B

Question. Test cross determines: 
(a) whether two traits are linked or not.
(b) the genotype of F2 plant.
(c) whether the two species will breed successfully or not.
(d) number of alleles in a gene.

Answer: B

Question. After cross-fertilisation of true-breeding tall and dwarf plants, the F1 generation was self-fertilised. The resultant plants have genotype in the ratio: 
(a) 1:2:1 (homozygous tall: heterozygous tall: dwarf).
(b) 1:2:1 (heterozygous tall: homozygous tall: dwarf).
(c) 3:1 (tall: dwarf).
(d) 3:1 (dwarf: tall).

Answer: A

Question. Which of the following characteristics of pea plants was not used by Mendel in his experiments? 
(a) Seed colour
(b) Seed shape
(c) Pod length
(d) Flower position

Answer: C

Question. Mendel took ________ contrasting characteristics of pea plants. 
(a) eight
(b) seven
(c) six
(d) five

Answer: B

Click below to download practice worksheet for CBSE Class 10 Biology Heredity and Evolution Worksheet Set B

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