Class 11 Anthropology Important Chapter 4 Human Evolution

Class 11 Anthropology Important Chapter 4 Human Evolution Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters ASSEB Class 11 Anthropology Important Solutions and select need one. AHSEC Class 11 Anthropology Additional Notes English Medium Download PDF. HS 1st Year Anthropology Important Solutions in English.

Class 11 Anthropology Important Chapter 4 Human Evolution

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. ASSEB Class 11 Anthropology Additional Question Answer are part of All Subject Solutions. Here we have given HS 1st Year Anthropology Important Notes in English for All Chapters, You can practice these here.

Human Evolution

Chapter: 4

IMPORTANT QUESTION AND ANSWER

Answer The Following Questions:

1. What is organic evolution?

Ans: Organic evolution is the gradual change and development of life forms from simple organisms to more complex ones due to environmental changes.

2. What is Lamarckism?

Ans: Lamarckism is the theory that organisms can inherit traits acquired during their lifetime due to environmental changes.

3. What is the main principle of natural selection?

Ans: The organisms with favorable traits are more likely to survive and reproduce, passing on these traits.

4. What is the theory of special creation?

Ans: The theory that life was created by a supernatural power, like God.

5. What is the role of mutations in evolution?

Ans: Mutations are sudden changes in genetic material that introduce new traits, which may lead to the formation of new species.

6. What are the two types of Neanderthal man?

Ans: Conservative Neanderthal and Progressive Neanderthal.

7. How does genetic drift differ from natural selection?

Ans: Genetic drift is random changes in gene frequencies, while natural selection is the non-random survival of organisms with advantageous traits.

8. What was the role of Charles Lyell’s work in shaping Darwin’s theory?

Ans: Lyell’s geological theories showed that Earth’s features changed over time, which influenced Darwin’s ideas about evolution.

9. What is organic evolution?

Ans: Organic evolution refers to the gradual change and development of life forms over time. Initially, life was composed of simple, single-celled organisms. Over millions of years, these organisms adapted to their changing environment, evolving into more complex, multicellular forms. Organic evolution explains the transition from simple life forms to the complex diversity of species present today, driven by mechanisms like natural selection and genetic variation.

10. What is Lamarckism? Explain its main ideas.

Ans: Lamarckism, proposed by Jean-Baptiste Lamarck, is a theory of evolution that suggests organisms change during their lifetime due to environmental influences, and these changes are passed down to offspring. 

The main ideas include:

Use and Disuse: Organs used frequently become more developed, while unused organs diminish.

Inheritance of Acquired Traits: Traits acquired by an organism during its lifetime (due to environmental pressures) are inherited by the next generation.

For example, Lamarck suggested that giraffes developed long necks by stretching to reach higher branches, and this trait was passed to future generations.

11. Describe Darwin’s theory of natural selection.

Ans: Darwin’s theory of natural selection is the process through which species evolve over time due to variations in traits. In a population, individuals with traits that give them an advantage in their environment (e.g., better camouflage or access to food) are more likely to survive and reproduce. These beneficial traits are then passed on to the next generation. Over time, this leads to the gradual accumulation of these advantageous traits, while less advantageous traits decrease in frequency. This process results in the adaptation of species to their environment.

12. Explain the concept of bipedalism and its importance in human evolution.

Ans: Bipedalism refers to the ability to walk on two legs. It is one of the key characteristics that distinguish humans from most other primates. Bipedalism allowed early human ancestors to travel more efficiently across open landscapes, freeing up their hands for tool use, carrying objects, and later, the development of complex tools. This form of locomotion also played a significant role in the development of the human brain and the ability to use tools, as it required changes in the structure of the pelvis, spine, and legs.

13. Discuss the importance of the fossil Ardipithecus ramidus.

Ans: Ardipithecus ramidus is one of the earliest known hominids, dating back to about 4.4 million years ago. Its fossil provides crucial evidence of the transition from tree-dwelling to ground-dwelling life. Ardipithecus had both ape-like and human-like features, showing traits of bipedalism but also retaining the ability to climb trees. The position of its foramen magnum (the hole in the skull where the spinal cord enters) suggests it walked upright. This fossil is significant because it shows the early stages of human evolution and the shift to a more terrestrial lifestyle.

14. What is the significance of Homo erectus in human evolution?

Ans: Homo erectus is one of the most significant species in human evolution because it shows major advancements in both anatomy and behavior. First appearing around 1.9 million years ago, Homo erectus is characterized by a larger brain size compared to earlier hominids (about 800-1100 cc). It is also the first species to exhibit fully upright posture and is believed to have used fire and created tools. Homo erectus was likely the first hominid to migrate out of Africa, spreading to Asia and Europe, marking a major step in the global spread of human ancestors.

15. What is the role of genetic drift in evolution?

Ans: Genetic drift is a mechanism of evolution that involves random changes in the frequency of alleles (gene variants) in a population. Unlike natural selection, which favors traits that improve survival, genetic drift occurs by chance. It is most significant in small populations, where random events can have a large effect on the gene pool. For example, if a natural disaster kills a large portion of a population, the alleles in the surviving individuals may not represent the full genetic diversity of the original population, leading to changes in allele frequencies.