NCERT Books for Class 10 Science - Heredity and Evolution - Free PDF Download
NCERT Books for Class 10 Science Chapter 9
FAQs on NCERT Books for Class 10 Science Chapter 9
1. How to download Class 10 Science Chapter 9 NCERT Book for CBSE?
Students can download it from NCERT official website. On this page, Students can download Class 10 Science Chapter-9 PDF Solutions of the Book.
2. What does the word Speciation mean?
It's a gradual evolutionary process in which populations develop into different species.
In the process of speciation, reproductive and geographical isolation are crucial factors. Genetic drift occurs when the frequency of an existing gene variant in a population changes.
Genetic drift, combined with natural selection, results in the development of new species over generations.
Other causes that can cause speciation include sudden severe DNA changes (mutation), such as chromosomal number alterations, and variance, such as female green beetles refusing to mate with male red beetles. Her actions secure reproductive isolation between them, resulting in the emergence of new species. It's a gradual evolutionary process in which populations develop into different species.
In the process of speciation, reproductive and geographical isolation are crucial factors.
3. In Chapter 9 of the NCERT book for Class 10 Science, what are similar organs?
Analogous organs are organs from different animals that perform similar activities. The structural appearance of these organs may differ, but their functions are the same in all creatures. While answering textbook questions, students can refer to Chapter 9 to acquire a better understanding of the ideas. There are topic-by-topic and exercise-by-exercise options available for students to use based on their needs. You can find further answers in the books and solutions of class 10 Science NCERT which are easily available for free on the Vedantu website. Also, one can find the answers readily available in the Vedantu app that can be downloaded from the Google Play Store.
4. What are the topics that are covered in the Chapter 9 of the class 10 NCERT Science book?
The topics in Chapter 9 are as follows:
Accumulation of Variation During Reproduction
Evolution
Acquired and Inherited Traits
Evolution and Classification
Evolution by Stages
Tracing Evolutionary Relationships
Fossils
Speciation
Evolution Should Not Be Equated With ‘Progress'
Human Evolution
Heredity
How do these Traits get Expressed?
Inherited Traits
Rules for the Inheritance of Traits – Mendel’s Contributions
Sex Determination
5. Why shouldn’t progress be associated with Human Evolution?
Progress should not be associated with human evolution because of the following given reasons:
Evolution is simply the generation and shaping of diversity through environmental selection.
The only apparent progressive trend in evolution appears to be the formation of increasingly complex body forms throughout time. However, this does not imply that previous designs are ineffective.
Bacteria, for example, live in the most inhospitable environments, such as hot springs, deep-sea thermal vents, and ice in Antarctica.
6. How are Evolution and classification interlinked?
Classification is the process of grouping organisms into useful categories based on plainly observable characteristics. Cell type (prokaryote or eukaryote), single-cell or multicellular, presence or lack of a nucleus, autotrophic (such as photosynthesis) or heterotrophic, sexual or asexual reproduction, and other characteristics are used to categorise organisms. The more features two species share, the more closely related they are. And the closer they are linked, the more recent a common ancestor they will have had. A brother and sister, for example, are more closely related than a female and her first cousin.