No. Question 3. (2014 D) 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. over water. Answer: Answer: Geographical isolation of a population caused by various types of barriers such as mountain ranges, rivers and seas, etc. 1. Answer: Before getting into the details of NCERT Solutions For Class 10 Science Chapter 9 Heredity and Evolution, let’s have an overview of the list of topics and subtopics under class 10 biology heredity and evolution NCERT solutions: Free download NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution PDF in Hindi Medium as well as in English Medium for CBSE, Uttarakhand, Bihar, MP Board, Gujarat Board, and UP Board students, who are using NCERT Books based on updated CBSE Syllabus for the session 2019-20. (d) All of the above, Question 3. (b) Birds have evolved from reptiles as the connecting link between reptiles and birds is Archaeopteryx (flying dinosaur). The other three colour of eye and skin and nature of hair are characters inherited from the parents. Question 40. Answer: Natural selection selects the individuals having useful variations which ensure their survival in the prevailing conditions of environment. 1. Wings of a bird and wings of a bat are homologous organs because they have similar basic design. simplest life forms; bacteria inhabits the most inhospitable habitats like hot springs, deep-sea thermal vents & ice in Antarctica. Why or why not ? Females have XX & males have XY. Since the extent of variations is much larger in sexually reproducing organisms, therefore, the chances of evolution is also much in sexually reproducing These variations enable the organisms to adapt themselves to the changing conditions and also help to face the struggle for Over the time, they and rise to new species. Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics ? Question 3. There is 1 pair of sex chromosomes present in human beings. (a) a Chinese school-boy. Mendel took two pairs of alternate expression of two traits and carried out dihybrid crosses by crossing them. Analogous organs : Those organs which have different basic structure (or different basic design) but have similar appearance and perform similar functions are called analogous organs. Question 9. (a) In Mendel’s experiment with pea plants, when he crossbred a round seed plant with a wrinkled seed plant, he found that the first generation (F1) was only round seed plants. Classification is the most important term to explain evolution. (a) Analogous organs Question 12. Question 9. (d) All of the above Homologous organs, analogous organs and vestigial organs help to identify evolutionary relationships amongst the species. the temperature at which fertilised eggs are kept determines the sex of developing animals in the eggs. (2013 OD, 2014 OD) Students can practice free MCQs as have been added by CBSE in the new Exam pattern. Answer: (c) a spider It occurs because dominant traits (round and yellow) express themselves, whereas recessive traits (wrinkled and green) get suppressed. All Chapter 9 - Heredity and Evolution Exercise Questions with Solutions to help you … If we cross pure-bred tall (dominant) pea plant with pure-bred dwarf (recessive) pea plant we will get pea plants of F1 generation. (b) List any two contrasting characters other than roundness of pea plants that Mendel used in his experiments with pea plants. Same is the equal genetic contribution of Charles Darwin in the progeny of first generation offspring... 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