Page no. 159<\/span><\/p>\nQuestion 1. \nMedelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progenies all bore violet flowers, but almost half were short. This suggests that the genetic make up of the tall parent can be depicted as \n(a) TTWWT \n(b) TTww \n(c) TtWW \n(d) TtWw \nAnswer: \n(b) TTww.<\/p>\n
Question 2. \nAn example of homologous organs is \n(a) our arm and a dog’s fore-leg, \n(b) our teeth and elephant’s tusks, \n(c) Potata and runners of grass. \n(d) All of the above. \nAnswer: \n(d) All of the above.<\/p>\n
<\/p>\n
Question 3. \nIn evolutionary terms, we have more in common with \n(a) a Chinese school-boy \n(b) a chimpanzee \n(c) a spider \n(d) a bacterium \nAnswer: \n(b) A chimpanzee.<\/p>\n
Question 4. \nA 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 ? \nAnswer: \nThe light coloured eyes of the children is due to dominant genetic character. Because in first generation according to the Menden’s Law of dominance only dominant characters appeared.<\/p>\n
Question 5. \nHow are the areas of study-evolution and classification-interlinkerd ? \nAnswer: \nEvolution of the organisms and classification of the organisms are interlinked because both the processes are in same direction. Both the processes move from simpler one to complex ones. Evolution and classification of organisms never move backwardly.<\/p>\n
Question 6. \nExplain the terms analogous and homologous organs with examples \nAnswer: \nAnalogous organs : Analogous organs are those organs whose structure (origin) is different and function same eg wings of insects, birds etc.<\/p>\n
Homologous organs : Those organs whose origin are same and function different called as homologous organs, eg Forelimbs of a frog bird and a man show the same basic design (or basic structure) of bones but they work differently. Such organs are called as homologous organs.<\/p>\n
Question 7. \nOutline a project which aims to find the dominant coat colour in dogs. \nAnswer: \nTo find the dominant coat colour in dogs the DNA Sequence has to be checked.<\/p>\n
Question 8. \nExplain the importance of fossils in deciding evolutionary relationships. \nAnswer: \nFossils provide the evidence that present animals (and plants) have originated from the previously existing ones. Turough the process. Of continously evolution fossils are the connecting links between many species and phylums.<\/p>\n
Question 9. \nWhat evidence do we have for the origin of life from inanimate matter ? \nAnswer: \nFor the origin of life from inanimate matter are amino acids. From simple elements, amino acids are formed. These amino acids part in the formation of genes. These genes like chemicals are suppose to be ancient living beings. So the amino acids are important for the origin of life.<\/p>\n
<\/p>\n
Question 10. \nExplain how sexual reproduction gives rise to more variable variation than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually ? \nAnswer: \nIn sexual reproduction two individuals are involved, one Male and the other female. Both may have different blood groups and the off springs produced may also vary in blood group. This way sexual reproduction gives rise to more variable variation. Change in DNA sequence and blood group can affect the evolution of their organism that produce sexually. For example, if any partner Suffering from an infection diseases, the off spring might also be affected by this disease.<\/p>\n
Question 11. \nHow is the equal genetic contribution of male and female parents ensured in the progeny? \nAnswer: \nEqual contribution of male and female parents is ensured in the progeny because both parents are involved in the formation of the zygote which leads to the formation of the of spring.<\/p>\n
Question 12. \nOnly variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement ? Why or why not. \nAnswer: \nNo, evolution cannot be said to progress from lower form to higher forms. Rather, evolution seems to have given rise to more complete body designs even while the simple body designs continue to flourish.<\/p>\n
Class 10 Science Chapter 9 Heredity and Evolution Textbook Activities<\/h3>\n Activity 9.1 (Page 143)<\/span><\/p>\nQuestion 1. \nObserve the ears of all students in the class. Prepare a list of students having free or attached ear lobes and calculate the percentage of students having each (Fig.) Find out about the earlobes of the parents of each student in the class. Correlate the earlobe type of each student with that of their parents. Based on this evidence, suggest possible rule for the inheritance of earlobes types. \nAnswer: \nThere are forty students in the class. Out of forty 12 students have attached earlobes and 28 have free earlobes. It means 30% of the students have attached and 70% students have free earlobes. \n \nFig. : (A) free and (B) attached earlobes. The lowest parts of the ear. called the earlobe. Is closely attached to the side of the head in some of us, and not in other. Free and attached earlobes are two variants found in human populations.<\/p>\n
<\/p>\n
Activity 9.2 (Page 144)<\/span><\/p>\nQuestion 1. \nIn Fig, what experiment would we do to confirm that the F2 generation did in fact have a 1 : 2 : 1 ratio of TT, Tt and tt trait combinations ? \nAnswer: \nIn this explanation, both TT and Tt are tali plants, while only tt is a short plant. In other words, a single copy of ‘T’ is enough to make the plant tail, while both copies have to be ‘t\u2019 for the plant to be short. Traits like ‘T\u2019 are called dominant traits, while those that behave like \u2018t\u2019 are called recessive traits.<\/p>\n
Class 10 Science Chapter 9 Heredity and Evolution Additional Important Questions and Answers<\/h3>\n Very Short Answer Type Questions<\/span><\/p>\nQuestion 1. \nWhat is Heredity ? \nAnswer: \nHeredity means the continuity of features from one generation to another. In other words, heredity can be defined as the resemblances among individuals related by descent.<\/p>\n
Question 2. \nName the plant on which Mendel performed his experiment. \nAnswer: \nMendel performed his experiments on garden pea.<\/p>\n
Question 3. \nDefine variation. \nAnswer: \nVariation can be defined as the occurrence of differences among the individuals.<\/p>\n
Question 4. \nDefine a gene. \nAnswer: \nA gene is a segment of D.N.A. on a chromosome occupying specific position and performs specific functions.<\/p>\n
Question 5. \nWrite the expanded form of D.N.A. \nAnswer: \nThe expanded form of D.N.A. is De-oxyribo nucleic Acid.<\/p>\n
<\/p>\n
Short Answer Type Questions<\/span><\/p>\nQuestion 1. \nWhat is a sex chromosome ? \nAnswer: \nThe pair of chromosomes which determines the sex of an individual is called sex chromosomes. In males, the sex chromosome are xy and the gametes they produced are the two types: x and y bearing. On the other hand, in females the sex chromos are xx and the gametes they produce are the only one type : X bearing<\/p>\n
Question 2. \nHow sex is determined in human beings ? \nAnswer: \nIn male individuals, one x-sex chromosome and one y sex chromosomes are present. In female individuals, the part of X sex chromosome is present.<\/p>\n
Question 3. \nDefine homologous organs? \nAnswer: \nHomologous organs are those organs which are formed on the same fundamental and structural plan but they differ in their shape because they have to function differently.<\/p>\n
Long Answer Type Question<\/span><\/p>\nQuestion 1. \nDescribe the principle of inheritance as explained by Mendel. \nAnswer: \nThe principle of inheritance was first of all explained by scientist named Mendel studied the inheritance of contrasting characters (or traits) like tallness, dwarfness etc. of the garden pea plant (Pisumsatum) in various generations of garden pea and came to the conclusion that the various contrasting characters or traits of the pea plant (like tallness; dwarfness etc.) are controlled by certain factors. Mendel considered these factors as the carriers of hereditary information from one generation of the pea plants to the next. We now know that the Mendel’s factors which were considered to be the carriers of hereditary information are actually genes. The term ‘gene’ was coined by a scientist named Johnson in 1909.<\/p>\n
<\/p>\n
Multiple Choice Questions<\/span><\/p>\nQuestion 1. \nLaws of inheritance were formulated by \n(a) Strass Burger \n(b) Mendel \n(c) Watson and Crick \n(d) Darwin \nAnswer: \n(b) Mendel<\/p>\n
Question 2. \nWhich was the material for Mendel’s work ? \n(a) Drosophila \n(b) Neuropteran \n(c) Pea plants \n(d) None of these \nAnswer: \n(c) Pea plants<\/p>\n
Question 3. \nA tall pea plant when crossed with a dwarf pea plant it produces tall offspring. This proves that tallness is: \n(a) Dominant factor \n(b) Recessive factor \n(c) Hybrid factor \n(d) Non-genetic factor \nAnswer: \n(a) Dominant factor<\/p>\n
Question 4. \nWhat is the name of discipline which deals with studies about inheritance of characters? \n(a) Cylology \n(b) Evolution \n(c) Genetics \n(d) Embryology \nAnswer: \n(c) Genetics<\/p>\n
Question 5. \nAccording to Mendels law of independent assortment in a dihybrid cross: \n(a) It is possible to calculate the rate of reproduction in animals. \n(b) The F generation contains 16 phenotypes. \n(c) Only one among 16 offsprings of F, generation exhibit both recessive characters. \n(d) F2 generation contains 4 genotypes in the ratio of 9 : 3 : 3 : 1. \nAnswer: \n(c) Only one among 16 offsprings of F, generation exhibit both recessive characters.<\/p>\n","protected":false},"excerpt":{"rendered":"
These NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams. Heredity and Evolution NCERT Solutions for Class 10 Science Chapter 9 Class 10 Science Chapter 9 Heredity and Evolution InText Questions and Answers In-text …<\/p>\n
NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","spay_email":""},"categories":[2],"tags":[],"yoast_head":"\nNCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution - MCQ Questions<\/title>\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\t \n\t \n\t \n