Class 12 Biology Chapter 24 Notes

• Important class 12 biology chapter 24 mcqs for Intermediate part-II students.
• What is genetic drift?
• What are hydrothermal vents? How do they support life?
• What are modern synthesis/ Neo-Darwinism? OR Give the concept of Neo-Darwinism.
• Write the name of theories of evolution presented by Lamarck and Darwin.
• What are vestigial organs? Name some important vestigial organs of man. OR What are vestigial organs? Give one example.
• Define the term Neo-Darwanism.
• Important class 12 biology chapter 24 notes pdf download for Intermediate part-II students.
• Define fossil. Where are most of the fossils found?
• Define endosymbiont hypothesis.
• Define endangered species. OR What are endangered species? Give examples. OR Differentiate between endangered and threatened species.
• Define Hardy Weinberg Theorem and give its equation in the form of binomial expansion.
• Differentiate between homology and analogy.
• Differentiate between homologous and analogous organs. OR Define homologous organs by giving examples.
• Important biology class 12 chapter 24 important questions for Intermediate part-II students.
• Name any four factors affecting gene frequency.
• State/define theory of special creation.
• What is membrane invagination hypothesis?
• What is Hardy-Weinberg Theorem?
• Differentiate between homologous and analogous organs.
• Important chapter 24 biology class 12 short questions for Intermediate part-II students.

• Which idea is known as endosymbiont hypothesis?  The eukaryotic cell might have evolved when a large anaerobic amoeboid prokaryotic ingested small aerobic bacteria and stabilized them instead of digesting them. This is known as endosymbiont hypothesis.
• What was the second idea of Lamarck called?  The second idea of Lamarck adopted, was called the inheritance of acquired characteristics. In this concept of heredity, the modifications an organism acquires during its lifetime can be passed along to its offspring e.g., the long neck of the giraffe.
• Important biology class 12 chapter 24 important long questions for Intermediate part-II students.
• What is the important turning point for evolutionary theory?  The origin of species convinced most biologists that species are products of evolution. An important turning point for evolutionary theory was the birth of population genetics, which emphasizes the extensive genetic variation within populations and recognizes the importance of quantitative characters.
• What was the statement or theorem of Hardy-Weinberg?  It states that the frequencies of alleles and genotypes in a population's gene pool remain constant over the generation unless acted upon by agents other than sexual recombination.
• Which mating is called non-random mating?  Individuals with certain genotypes sometimes mate with one another more commonly than would be expected on a random basis. This is called non-random mating.
• Important Ch 10 Biology Class 12 important questions and answers for Intermediate part-II students.
• On what evidence Darwin's theory of evolution was mainly based.  Darwin's theory of evolution was mainly was mainly based on evidence from the geographical distribution of species and from the fossil record.
• What is the concept of special creation?  According to the theory of special creation all living things came into existence in their present forms especially and specifically created by nature. Among the scientists who believed in divine creation was Carolus Linnaeus.
• What is the concept of Evolution.  The idea that organisms might evolve through time, with one type of organism giving rise to another type of organism is called evolution.
• Important Chapter 10 Biology Class 12 notes for Intermediate part-II students.
• What did Lamarck said about the use and disuse of organs?  Lamarck argued that those parts of the body used extensively to cope with the environment become larger and stronger, while those that are not used deteriorate.
• What was Darwin's idea of Origin of Species?  A new species would arise from an ancestral form by the gradual accumulation for adaptations to different environment, separated from original habitat by geographical barriers.