FBISE Class 9th (SSC-l)
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FBISE Class 9th (SSC-l)
Answer: The law of use and disuse states that organs used frequently develop more, while organs not used gradually degenerate.
Answer: Paleontology is the scientific study of fossils, which provides evidence for evolution.
Answer: Lamarck used the giraffe's long neck as an example of use and disuse leading to an acquired characteristic.
Answer: Sedimentary rocks form in layers over time and are the most common rocks in which fossils are preserved.
Answer: The principle of superposition states that in undisturbed rock layers, older fossils lie below younger ones.
Answer: Similar basic structures in homologous organs suggest that the organisms evolved from a common ancestor.
Answer: Charles Darwin proposed the theory of natural selection in his book 'On the Origin of Species'.
Answer: Analogous organs develop independently in unrelated organisms adapting to similar environments, a process called convergent evolution.
Answer: Dinosaurs went extinct around 65 million years ago, possibly due to an asteroid impact and climate change.
Answer: Natural selection favours organisms best suited to their environment, allowing them to survive and pass on their traits.
Answer: Variations are the differences that exist among individuals of the same species, which are important for natural selection.
Answer: These structures are vestigial remnants left over from evolutionary ancestors and have lost their original functions.
Answer: Variation provides the raw material on which natural selection can act, favouring some individuals over others.
Answer: Embryology studies embryos; similar early embryos of different vertebrates provide evidence of common ancestry.
Answer: Fossils of Australopithecus are considered among the earliest known human ancestors that walked upright.
Answer: Similarities in early embryonic stages among diverse vertebrates point to a shared evolutionary ancestry.
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Answer: Overproduction means that organisms produce more offspring than the environment can support, leading to competition.
Answer: The more similar the DNA or protein sequences of two organisms, the more recently they likely shared a common ancestor.
Answer: Homo habilis, meaning 'handy man', is associated with the earliest stone tools.
Answer: Because of overproduction, individuals compete for limited resources, which is called the struggle for existence.