(b) Give an example where environmental factors like temperature determines the sex of the offspring. Answer: The trait of other parent plant, dwarfness, being recessive did not show up in the progeny of first generation. MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. However, on selfing the F1 generation pea plants, he obtained both tall and short plants in F2 generation. DNA – (Deoxyribo Nucleic Acid) is the information source for making proteins in the cells. The rapid environmental changes cannot be favouable for them. (b) In some reptiles, the temperature at which the fertilised egg is incubated before hatching plays a role in determining the sex of the offspring. Will geographical isolation be a major factor in the speciation of a self- pollinating plant species ? Past Year Question Papers. The study of heredity and variations is known as genetics. The females carry two X-chromosomes. Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics ? Question 32. It is through the constant process of evolution taking place in the organisms since the origin of life that such an enormous variety of plants and animals have come to exist on this earth at present. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. There is an inbuilt tendency to variation during reproduction due to errors in DNA copying and as a result of sexual reproduction. Y-chromosome IV X-chromosome (a) TTWW Two factors that could lead to speciation: Question 3. Question 8. All NCERT textbook questions have been solved by our expert teachers. When two DNA … (i) Speciation: The process by which new species develop from the existing species is known as speciation. Thus, fossils have importance in deciding evolutionary relationships. If a sperm carrying X chromosome fertilises an ovum, then the child bom will be a girl. For palaeontological studies a scientist will gather the evidences from 3 docs. So fossils are such remains or impressions of dead animals or plants that lived in the remote past but which were not decomposed completely. Question 3. Give the respective scientific terms used for studying:  (2014 D) “The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it”. This law explains expression of only of the parental character which is dominant trait in F1 generation and expression of both in F2 generation. ‘Two areas of study namely ‘evolution’ and ‘classification’ are interlinked”. (a) Mendel in one of his experiments with pea plants crossed a variety having round seeds with one having wrinkled seeds. Here, one is a normal-sized X-chromosome while other is a short Y-chromosome. In other words, the variation if given survival advantage, it will be naturally selected. Variations caused in individuals due to a natural selection. Answer: Genetic drift caused by drastic changes in the frequencies of particular genes by chance alone. (a) Genes are specific sequence of bases in a DNA molecule. Answer: Heredity and Evolution Notes For Class 10 Formulas Download PDF 1. The wings of a butterfly and the wings of a bat cannot be regarded as homologous because they have different basic design though they are used for the same purpose of flying. Evolution is the sequence of gradual changes which take place in the primitive organisms over millions of years in which new species are produced. Question 1. Conclusion. (d) All of the above The mixture was maintained at a temperature just below 100◦C and sparks were passed through the mixture of gases. Geographical isolation cannot be a major factor in the speciation of an asexually reproducing organism because it does not require any other organism to carry out reproduction. Homologous: Similar structure different functions. Answer: Question 3. Question 11. 6 docs. In the F1 progeny, no dwarf plants were obtained. If these changes are not controlled, tigers would be wiped out. This suggests that the genetic make-up of the tall parent can be depicted as Answer: (2012 OD) Habits and behaviour of extinct species can be inferred. You may Re-attempt the test any number of times. • The zygote develops into a particular type of offspring only. However, these organs perform different functions in different organisms. At the end of Multiple Choice Questions, the answer key has also been provided for your reference. (2012 OD, 2013 D, 2015 D, 2016 D) Why or why not? Some of the variations may be so drastic that the new DNA copy cannot work with the cellular apparatus it inherits. (a) Frequency of certain genes in a population changes over several generations resulting in evolution. Archaeopteryx has feathered wings like birds but teeth and tail like those of reptiles. (d) Both organs in all options have same basic structural design but have different functions and appearance. Can the wing of a butterfly and the wing of a bat be considered homologous organs ? Question 37. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Question 4. The geographical isolation leads to reproductive isolation due to which there is no flow of genes between separated groups of population. Answer: Question 5. Inference: This indicates that both the tallness & shortness traits were inherited in the F, plants, but only the tallness trait was expressed. For example: The wings of an insect and a bird have different structures but they perform the same function of flying. Evolution and classification are interlinked with each other in many ways. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question … IV. Flow chart depicting Mendel’s experiment. (2011 OD) (b) Analogous organs. Secondary School. 4. So the experiences of an individual during its lifetime cannot be passed on to its progeny. 3. (b) If flowers of F1 plants are self-pollinated Therefore, DNA copying is accompanied by the creation of an additional cellular apparatus, and then DNA copies separate, each with its own cellular apparatus. (a) Name any four varieties of vegetables which have been produced from ‘wild cabbage’ by the process of artificial selection. Characters or features or traits are inherited from one generation to the next during reproduction. Question 8. Answer: Why is DNA copying necessary during reproduction? The more characteristics two species will have in common, the more closely they are related. DNA copying is accompanied by the creation of an additional cellular apparatus. Her behavior ensures the reproductive isolation between them and thus results in generation of new’ species. For example, The wing of a bat, flipper of a seal, front leg of a horse and arm of a man are homologous organs. (d) TtWw Question 9. And the more closely they are related, the more recently they will have had a common ancestor. Out of two contrasting traits only one expresses itself in an individual. It is the carrier of hereditary information from parents to the next generation. Question 3. Question 10. In evolutionary terms, we have more in common with [NCERT] Thus, a common evolutionary origin can be established. Yellow colour and round shape is dominant over green colour and wrinkled shape. Answer: There may be variations due to interchange of homologous chromosomes during crossing over of male and female. (2011 OD) Answer: Answer: If a sperm carrying X-chromosome fertilises an ovum carrying X-chromosome, then the child born will be a girl. The acquired traits of an organism cannot be passed on to its future generations. When this generation reproduces, the offspring would have differences they inherit from previous generation as well as newly created differences. The geographical isolation cannot be major factor in the speciation of a self-pollinating plant species because it does not have to look the plants for its process of reproduction to be carried out. humans. Dronstudy provides free comprehensive chapterwise class 10 Science notes with proper images & diagram. (2011 D) According to this law, the characteristics (or traits) of an organism are determined by internal ‘factors’ which occur in pairs. Inference: The tall/short trait and the round seed/wrinkled seed trait are independently inherited. Answer: Free Question Bank for 10th Class Science Heredity and Evolution Heredity and Evolution Answer: 10th Class - CBSE - Biology - 1955 Questions - 0 Concepts. Give an example of body characteristics, used to determine how close two species are in terms of evolution and explain it. Describe, in brief, two methods of determining the age of fossils. Homologous organs are those organs which have the same basic structural design and developmenta’ origin but have different functions and appearance. (c) TtWW, Question 2. (a) The cross between RRyy and rrYY seeds will produce RrYy (round and yellow) seeds in F1-generation, because round and yellow are the dominant traits. State two methods of determining the age of fossils. Gametes in the sexually reproducing organisms are formed by the process of meiosis during which half of the genetic material goes into each gamete. What are homologous organs? For example: Birds have evolved feathers as a means of providing insulation to their bodies in cold weather but later on these feathers became more useful for the purpose of flying. (2011 OD) 48 docs 6 tests. Bacteria is a primitive organism as they came into being very early in evolution. These two may be identical (TT or tt) or may be different (Tt), depending on the parentage. This is because each individual is carrying two alleles. CLICK HERE to watch them HEREDITY AND EVOLUTION Heredity- Heredity is the phenomena of inheritance of traits/features from the parents to their offspring’s/progeny. tall & round are dominant. Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species ? Thus the surviving newborn cells are similar to but subtly different from each other. (b) TTww When the gametes from male and female parents fuse with each other during sexual reproduction, the normal complement is restored. carry Y-chromosome (22 + Y). How is the sex of the child determined in human beings ? These heredity and evolution class 10 exercise answers were prepared by the best faculty in India to score good marks in the subject Science. If the progeny has all black dogs then the dominant coat colour is black. When organisms reproduce asexually, a basic event in reproduction is the creation of a DNA copy. (b) What must be the percentage of white flower plants in F2 generation if flowers of F1 plants are self-pollinated? Question 5. Answer: Natural selection selects the individuals having useful variations which ensure their survival in the prevailing conditions of environment. 10 Science Chapter 9 Heredity and Evolution Intext questions and exercises question answers are given below in English and Hindi Medium updated for academic session 2020-21. For example, The wings of an insect and a bird are analogous organs. Geographical isolation of a population caused by various types of barriers like mountain ranges, river, sea etc. Thus the surviving cells are similar to but subtly different from each other. Males contain one X chromosome and one Y chromosome (XY), while females contain two X chromosomes (XX). Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 10 Biology Heredity and Evolution. (a) a Chinese school boy (b) round and green Drastic change in the genes or DNA called mutation is also a cause of speciation. (b) In the F2 generation, both the tall and dwarf traits are present in the ratio of 3 :1. The process by which new species develop from the existing species is known as speciation. This is because the cut tail of mice is an acquired trait which is never passed on to their progeny. Question 14. How do Mendel’s experiments show that traits may be dominant or recessive ? Question 21. Deoxyribonucleic acid is a genetic material found in all the living organisms. (c) fossils Archaeopteryx is, therefore, a connecting link between the reptiles and birds, and hence suggests that the birds have evolved from the reptiles. However, that doesn’t mean that the older designs are inefficient. III. Environment: for e.g. 3 docs. (2014 D) List four factors that could lead to speciation. Answer: During sexual reproduction there is ‘crossing over’ of chromosomes, that gives rise to variations. It helps in revising the important topics related to the chapter. Sometimes, the conditions in the environment like oxygen, moisture, etc. Class 10 Science Chapter 9 Heredity and Evolution Explanation in Hindi, Imp Questions and Answers. 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(i) Reproduction genetic drift. Find an answer to your question Heredity and evolution class 10 notes 1. we all come from Africa. Question 6. At the end of a week, 15% of the carbon (from methane) had been converted to complex compounds of carbon including amino acids which make up protein molecules in the living beings. Question 1. Explain with the help of suitable examples why certain traits cannot be passed on to the next generation? [CBSE 2011, 2014] The process of copying of DNA brings some variations each time. How is the equal genetic contribution of male and female parents ensured in the progeny ? Explain with the help of an example. . (ii) the development of new type of organisms from the existing ones. Study of heredity is termed as Genetics. Fossils were once living objects and all living objects contain some carbon-14 atoms which are radio-active. Evolution. 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