What part of brain is responsible for regulation of posture
What part of brain is responsible for regulation of posture/ Biology
Answer in a word or sentence:
- Who gave the theory of natural selection and the concept of ‘organic evolution’?
- What idea is proposed by J.B.S Haldane about the origin of life on earth?
- Give an example where environmental factors play a major role in sex determination.
- What is the requirement if a change has to be inherited?
- What is the basic most common characteristic of all animals, plants and humans?
- Name an organism that has rudimentary eyes?
- What kind of characteristics is considered helpful in tracing the evolutionary relationships among species?
- Who was the first person to devise the principles of inheritance?
- Give an example of homologous organs?
- Fossil remains of which organism shows characteristics of both birds and reptiles?
Answer the following:
- Describe the mechanism that determines the sex of a child.
- Explain the concept of acquired trait with the help of an example?
- Explain the theory of natural selection given by Darwin?
- Mention the contribution of Lamarck in understanding the concept of evolution?
- Explain the meaning of term speciation? Mention its significance also?
- What will happen if due to some accident changes occur in the gene frequency of members of sub population of a species? Also identify the name of this phenomenon?
- Mention some of the tools for tracing evolutionary relationships among species?
- Define the term “characteristics”. Why study of characteristics of species is considered helpful?
- What do you understand from tissue level of organization?
- How can it be said that birds are closely related to reptiles?
- “A brother and sister are more related to each other as compared to the case when any one of them is related with his/her cousin.” Through this statement what will we get to know about their ancestors?
- Describe briefly the origin of earliest members of human species and how they were spread in different parts?
- Why it is more appropriate to compare the process of evolution with branches of a tree rather than with a ladder?
- Why Mendel chose pea plant for his experiments? Mention any two reasons.
- Mention any two advantages of variation in individuals?
- What do you mean by the term “variation”?
- What is a monohybrid cross?
- In Mendel’s experiments what is the meaning of term dominance?
- What will happen when a pea plant with violet flowers is cross bred with pea plant having white flowers?
- What will happen if F1 generation obtained in monohybrid cross is self pollinated? Explain with the help of an example.
- On the basis of Mendel’s experiments what are factors and their significance?
- Describe the law of independent assortment with the help of an example.
- What are fossils? What is the significance of studying fossil records?
- What do you mean by the term evolution?
- Group the following given organs in three divisions; homologous organs, analogous organs and vestigial organs respectively.
- What are the two ways by which we can find out the age of a fossil?
- Explain the term analogous organs with the help of an example.
- Describe the biogenetic law?
- What are the evidences that can be used to study organic evolution?
- A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits − blood group A or O − is dominant? Why or why not?
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