Science Group
Explore subjects and practice MCQs
7
Chapters
1,610
Total MCQs
Science Group
Answer: Artificial selection is the intentional breeding by humans of organisms with desirable characteristics.
Answer: During human evolution, brain size increased greatly, enabling tool use, language, and complex thought.
Answer: Artificial selection is commonly called selective breeding because humans select which individuals breed.
Answer: Bipedalism, the ability to walk on two legs, was a major step in human evolution.
Answer: Analogous organs form through convergent evolution as unrelated organisms adapt to similar environments.
Answer: Galapagos finches evolved different beak shapes suited to different food sources, demonstrating natural selection.
Answer: In natural selection, the environment naturally selects organisms best suited to survive and reproduce.
Answer: During the Industrial Revolution, dark-coloured moths survived better on soot-darkened trees, showing natural selection.
Answer: Alfred Russel Wallace independently formulated the theory of natural selection and presented it jointly with Darwin.
Answer: Speciation is the evolutionary process by which new species arise from existing ones.
1571
Answer: Adaptations are inherited characteristics that increase an organism's chances of survival and reproduction in its habitat.
Answer: Individuals with favourable traits survive and reproduce more, so those traits become more common over generations.
Answer: Camouflage helps the chameleon hide from predators and also to ambush prey, improving its survival.
Answer: Without genetic variation there is nothing for natural selection to act upon, so evolution cannot occur.
Answer: Overhunting and destruction of habitat drove dodos and passenger pigeons to extinction.
Answer: Cacti have long roots and succulent stems that store water, adapting them to dry desert conditions.
Answer: Thick fur and fat layers insulate polar bears against the extreme cold of their Arctic environment.
Answer: The similar underlying bone structure of these forelimbs is evidence that all mammals share a common ancestor.
Answer: The generally accepted sequence of human ancestors runs from Australopithecus through Homo habilis and Homo erectus to Homo sapiens.
Answer: Extinction is the permanent loss of a species when its last individuals die out.