NCERT Solutions for Class 10 Science Chapter 9

NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution Page 143 or Page 147 or Page 150 or Page 151 or Page 156 or Page 158 or Exercises in English Medium or पेज 157 or पेज 161 or पेज 165 or पेज 166 or पेज 171 or पेज 173 or अभ्यास के प्रश्न उत्तर in हिंदी मीडियम  in PDF form to free download. Download NCERT Books Solutions apps for offline use.


Class:10
Subject:Science – विज्ञान
Chapter:Heredity and Evolution

NCERT Solutions for Class 10 Science Chapter 9

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10 Science Chapter 9 Page 143 Answers

10 Science Chapter 9 Heredity and Evolution Intext questions on page 143 are given below. For the other questions, please visit to Page 147 or Page 150 or Page 151 or Page 156 or Page 158 or Exercises or go for हिंदी मीडियम Solutions. Visit to Class 10 Science  main page or Top of the page.

10 Science Chapter 9 Heredity and Evolution Intext questions on page 143

10 Science Chapter 9 Page 147 Answers




10 Science Chapter 9 page 147 are given below. For the other questions, please visit to Page 143 or Page 150 or Page 151 or Page 156 or Page 158 or Exercises or go for हिंदी मीडियम Solutions. Visit to Class 10 Science  main page or Top of the page.

10 Science Chapter 9 page 147



10 Science Chapter 9 page 147 intext question answers pdf
10 Science Chapter 9 page 147 all answers guide

10 Science Chapter 9 Page 150 Answers





Class 10 Science Chapter 9 Intext questions on page 150 are given below. For the other questions, please visit to Page 143 or Page 147 or Page 151 or Page 156 or Page 158 or Exercises or go for हिंदी मीडियम Solutions. Visit to Class 10 Science  main page or Top of the page.

Class 10 Science Chapter 9 Intext questions on page 150

10 Science Chapter 9 Page 151 Answers




NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution Intext questions on page 151 are given below. For the other questions, please visit to Page 143 or Page 147 or Page 150 or Page 156 or Page 158 or Exercises or go for हिंदी मीडियम Solutions. Visit to Class 10 Science  main page or Top of the page.

NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution Intext questions on page 151

10 Science Chapter 9 Page 156 Answers




Class 10 Science Chapter 9 Heredity and Evolution Intext questions on page 156 are given below. For the other questions, please visit to Page 143 or Page 147 or Page 150 or Page 151 or Page 158 or Exercises or go for हिंदी मीडियम Solutions. Visit to Class 10 Science  main page or Top of the page.

Class 10 Science Chapter 9 Heredity and Evolution Intext questions on page 156

10 Science Chapter 9 Page 158 Answers





10 Science Chapter 9 page 158 are given below. For the other questions, please visit to Page 143 or Page 147 or Page 150 or Page 151 or Page 156 or Exercises or go for हिंदी मीडियम Solutions. Visit to Class 10 Science  main page or Top of the page.

10 Science Chapter 9 page 158

10 Science Chapter 9 Exercises Answers




NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution Exercises are given below. For the other questions, please visit to Page 143 or Page 147 or Page 150 or Page 151 or Page 156 or Page 158 or go for हिंदी मीडियम Solutions. Visit to Class 10 Science  main page or Top of the page.

NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution Exercises
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10 विज्ञान पाठ 9 पेज 157 के उत्तर




NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution Intext questions on page 157 are given below. For other questions, please visit to पेज 161 or पेज 165 or पेज 166 or पेज 171 or पेज 173 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit to Class 10 Science  main page or Top of the page.

NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution Intext questions on page 157

10 विज्ञान पाठ 9 पेज 161 के उत्तर





10 Science Chapter 9 page 161 are given below. For other questions, please visit to  पेज 157 or पेज 165 or पेज 166 or पेज 171 or पेज 173 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit to Class 10 Science  main page or Top of the page.

10 Science Chapter 9 page 161

10 विज्ञान पाठ 9 पेज 165 के उत्तर




Solutions for Class 10 Science Chapter 9 Heredity Intext questions on page 165 are given below. For other questions, please visit to  पेज 157 or पेज 161 or पेज 166 or पेज 171 or पेज 173 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit to Class 10 Science  main page or Top of the page.

Solutions for Class 10 Science Chapter 9 Heredity Intext questions on page 165

10 विज्ञान पाठ 9 पेज 166 के उत्तर





10 Science Chapter 9 Page 166 are given below. For other questions, please visit to  पेज 157 or पेज 161 or पेज 165 or पेज 171 or पेज 173 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit to Class 10 Science  main page or Top of the page.

10 Science Chapter 9 Page 166

10 विज्ञान पाठ 9 पेज 171 के उत्तर




10 Science Chapter 9 page 171 are given below. For other questions, please visit to  पेज 157 or पेज 161 or पेज 165 or पेज 166 or पेज 173 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit to Class 10 Science  main page or Top of the page.

10 Science Chapter 9 page 171

10 विज्ञान पाठ 9 पेज 173 के उत्तर





Class 10 Science Chapter 9 Heredity Intext questions on page 173 are given below. For other questions, please visit to  पेज 157 or पेज 161 or पेज 165 or पेज 166 or पेज 171 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit to Class 10 Science  main page or Top of the page.

Class 10 Science Chapter 9 Heredity Intext questions on page 173

10 विज्ञान पाठ 9 अभ्यास के उत्तर




NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution अभ्यास के प्रश्न उत्तर are given below. For other questions, please visit to  पेज 157 or पेज 161 or पेज 165 or पेज 166 or पेज 171 or पेज 173 or go for English Medium Solutions. Visit to Class 10 Science  main page or Top of the page.

NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution अभ्यास के प्रश्न उत्तर




10 science ch. 9
ch. 9 science for class 10 guide

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Important Questions with answers

Heredity and Evolution

Question 1:
Difference between Inherited and Acquired traits.
Answer 1:
Inherited Traits
1. The traits which are inherited by the parents (father and mother) by the off springs (progeny) are called inherited traits.
2. These traits cannot be acquired in the life time but are inherited from parent to the progeny.
3. These traits are due to genetic make-up of the progeny.
Acquired Characters
1. The traits which an individual does not inherit from its parent.
2. These traits are acquired by the individuals due to life time experiences. They are not transmitted
3. These traits are not inherited over generations. Because these traits or experiences are not incorporated in the germ cells (genome or DNA make up) of the individual.

Question 2:
How is the equal genetic contribution of male and female parents ensured in the progeny?
Answer 2:
Genetic material in most organisms is present in pair of chromosomes. Gametes in sexually reproducing organisms are formed by the process of meiosis (a type of cell division occurring mainly in reproductive cells for the formation of gametes) during which half of the genetic material goes into each gamete. When the gametes from male and female parents fuse with each other during sexual reproduction, the normal complement is restored. Half of the genetic material comes from female and half from the male. Thus, process of meiosis is necessary to ensure equal genetic contribution of male and female parents through gametes.



Question 3:
Experiences of an individual during its lifetime cannot be passed on to its progeny and cannot direct evolution. Justify this statement giving an example.
Answer 3:
Experiences of an individual during its life time are in the somatic cells of the body. That is, in non-reproductive tissues that cannot be passed to the next generation. Thus, they cannot contribute directly in evolution.
For inheritance of traits over generations and involvement in direct evolution, they must be passed to the DNA of the germ cells (reproductive tissues). The characteristics of DNA are passed to the progeny and also can play direct role in evolution.

Question 4:
Differentiate between Homologous Organs and Analogous Organs.
Answer 4:
Homologous organs
1. Organs with similar basic plan of origin but different in function.
2. Fundamental plan of structure is similar e.g., fore-limb of man, horse and whale.
Analogous organs
1. Organs with similar function but different in origin.
2. Fundamental plan of structure is different e.g., wings of butterfly and bat.


More Questions for Exams

Question 1:
What are fossils? State their importance in the study of evolution with the help of a suitable example.
Answer 1:
Fossil: A fossil is the record of an organism that lived in the geologic past. Remains, impressions, cast , mould and traces of organisms of past have been preserved in the earth’s crust as fossils. Fossils help us to build up broad historical sequence of biological evolution. For example, the study of fossils of Equidae (horse) family provides reliable records of evolution. The dawn horse-five-toed Echippus, gave rise to Mesohippus which in turn developed into several lines of evolution. The modern Equus (one-toed horse) evolved from Pliohippus.

Question 2:
What is organic evolution?
Answer 2:
Evolution can be defined as the changes in the genetic composition of a population with the passage of each generation. Evolution can be defined as the gradual unfolding of the organism from pre-existing organism through change since the beginning of life. The origin of life is very much associated with evolution. Evolution or organic evolution is the study of how complex organisms of today evolved (formed) from the simpler forms of the past.

Question 3:
How are fossils formed? State two methods of determining the age of fossils.
Answer 3:
Fossil: Remains, impression, casts or traces of organisms of past geologic ages have been preserved in earth’s crust called fossils.
Determining age of a fossil: There are two methods:
(i) This is relative, the fossils we find closer to the surface are more recent than the fossils we find in deeper layers of earth’s crust.
(ii) The second way of dating fossils is by the ratios of different isotopes of same element in the fossil material.

Question 8:
Define the following: (a) Analogous Organs (b) Evolution (c) Genetic Drift
Answer 8:
(a) Analogous: Organs which look similar because they have common use but differ in their structure and components are called analogous organs
(b) Evolution: The gradual unfolding of events by which new organisms evolved from pre-existing organisms through changes since the beginning of life, is said to be evolution.
(c) Genetic Drift: The random change in gene frequency and gene number by chance only, irrespective of its being advantageous or not in a population is called genetic drift. The effect of genetic drift is very small in a large if population is small.

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