Here, you'll find important questions related to Chapter 13 Human Evolution For ICSE Class 10 Biology. These questions have been crafted to assist students in their preparation for the ICSE Class 10 Biology Examination in 2023–24. By practising various question types, students can clarify their doubts, enhance their exam readiness, boost their confidence, and refine their problem-solving skills
The study of human evolution is a captivating journey through the annals of biological history. It not only sheds light on our ancient ancestors and their remarkable adaptations but also provides crucial insights into the fundamental concepts of biology. For students of Class 10 ICSE, grasping the intricacies of human evolution is a key aspect of their curriculum, and the pursuit of answers to important questions in biology holds great significance. In this exploration, we will embark on a fascinating voyage into the world of human evolution, delving into the origins of Homo sapiens, the processes of natural selection, and the remarkable fossil evidence that supports our understanding of this scientific narrative. Furthermore, we will underscore the value of addressing important questions for Class 10 ICSE biology, as they serve as guiding lights on this intellectual journey, helping students build a solid foundation in this compelling field of study.
Human evolution refers to the process of development and transformation of the human species, Homo sapiens, from ancestral primates over millions of years. It is a fascinating scientific journey that explores how modern humans have evolved from common ancestors shared with other primates, including apes and early hominins.
Key aspects of human evolution include:
Human evolution is a dynamic and ongoing process. While the majority of changes in our species occurred in the distant past, it continues through small-scale genetic variations and adaptations in contemporary human populations. Understanding human evolution is not only a scientific pursuit but also provides valuable insights into the history, diversity, and nature of the human species.
Ans. (a) Neanderthal man
Homo erectus neanderthalensis, also called as Neanderthal man evolved during the late Pleistocene epoch.
Ans. (b) 900 c.c.
The stage of Homo erectus lived about 1.5 million years ago. They had an average cranial capacity of about 1000 cc, significantly larger than that of early hominids.
So, it can be concluded that Homo erectus had a large brain having cranial capacity around 900 cc.
The characteristics are :
(i) Cranial cavity was about 735 cm3
(ii) Smaller moderately-prognathic face and smaller teeth
(iii) Showed bipedal gait
The two adaptations were :
(i) Modern human-like body proportions
(ii) Relatively elongated legs and shorter arms
The study of human evolution stands as a testament to our enduring quest for knowledge about our origins and the remarkable journey that has led to the emergence of Homo sapiens. Moreover, in our quest for knowledge, resources such as oswal.io provide invaluable support. Oswal.io offers a valuable resource in the form of a comprehensive collection of questions, aiding students in their preparation and deeper understanding of this crucial aspect of biology.
Ans: An example of natural selection in humans is the prevalence of sickle cell anaemia in Africa. They are resistant to malaria infection in heterozygous conditions.
Ans: Human beings have remnants of the third eyelid called the nictitating membrane. It is a vestigial organ. It was present in our ancestors.
Ans: The palmar grasp reflex, wisdom teeth, tail bone, ear muscle, appendix etc. are the vestigial structures in humans.
Ans: Ape-like, hairy primates called Dryopithecus and Ramapithecus existed 15 mya. Australopithecus existed 2 mya. They used stone weapons to hunt.
Then came the first human-like hominid called Homo habilis who had brain capacities of 650-800 cc.
Homo erectus existed 1.5 mya. They had a larger brain (900 ccs) and ate meat.
Neanderthals lived 1-0.4 mya. They used hides to protect their bodies.
The modern man i.e Homo sapiens came into existence 0.75-0.1 mya.
Ans: Speciation is a very slow process and it results in evolution. Speciation is the process of the formation of new species. Small variations in the gene pool of an organism, because of various factors such as mutation, sexual reproduction, geographical isolation, genetic drift, etc. result in the formation of distinct species. This process is very slow and takes millions of years.
Speciation-The formation of new and distinct species in the course of evolution. Evolution-The gradual development of something, especially from a simple to a more complex form.