FBISE Class 9th (SSC-l)
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FBISE Class 9th (SSC-l)
Answer: Individuals with advantageous variations are better able to survive and reproduce, passing these traits to offspring.
Answer: Molecular data such as DNA sequences provide the most direct evidence of evolutionary relatedness.
Answer: Natural selection is often described as survival of the fittest, where the best-adapted individuals survive.
Answer: The main difference is the selecting agent: humans in artificial selection and the environment in natural selection.
Answer: Bat and bird wings share a similar bone pattern inherited from a common ancestor, so they are homologous.
Answer: Geographical isolation separates populations, allowing them to evolve independently and eventually form new species.
Answer: Fossils are the preserved remains or impressions of organisms from past geological ages.
Answer: Geographical isolation by physical barriers prevents interbreeding, leading to independent evolution and possibly speciation.
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Answer: Convergent evolution causes unrelated species to develop similar adaptations when exposed to similar environments.
Answer: The fossil record shows a sequence of organisms that lived at different times, supporting the idea of change over time.
Answer: Homologous organs share a common basic structure and origin but may perform different functions, like the forelimbs of mammals.
Answer: Adaptations accumulate over generations as natural selection favours individuals with beneficial variations.
Answer: Vestigial organs are reduced, non-functional remnants of organs that were functional in ancestral organisms.
Answer: Destruction of habitat removes the conditions needed for a species to survive, often leading to extinction.
Answer: Divergent evolution occurs when related species gradually become different as they adapt to different environments.
Answer: If a species cannot adapt to changes in its environment, its members die out and the species may become extinct.
Answer: The appendix is a vestigial organ in humans, a remnant of a larger organ used for digestion in plant-eating ancestors.
Answer: Fossil evidence indicates that human evolution began in Africa.
Answer: Homologous organs arise through divergent evolution from a common ancestor into different functions.
Answer: Molecular biology compares DNA sequences and proteins; greater similarity indicates closer evolutionary relationships.