OBJECTIVE LIFE SCIENCE
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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continual increases in population size.
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Aquired Characteristics that come from the actions of organisms as they use or fail to use body structures (neck stretching)
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an unchanging local environment.
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the natural variations already present within the population of organisms.
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Detailed explanation-1: -According to Lamarck, new needs (besoins) arise in animals as a result of a change in the environment. This leads to new types of behaviour involving new uses of pre-existing organs. Their use leads to an increase in size or to other methods of functioning. Conversely, the disuse of other parts leads to their decline.
Detailed explanation-2: -Lamarck believed that the long necks of giraffes evolved as generations of giraffes reached for ever higher leaves. Lamarck was struck by the similarities of many of the animals he studied, and was impressed too by the burgeoning fossil record. It led him to argue that life was not fixed.
Detailed explanation-3: -The crucial difference between “Darwinian” and “Lamarckian” mechanisms of evolution is that the former emphasizes random, undirected variation whereas the latter is based on variation directly caused by an environmental cue and resulting in a specific response to that cue (Figure 1).
Detailed explanation-4: -Change Through Use And Disuse. Organisms Driven To Greater Complexity. Inheritance of Acquired Characters. Effect of Environment and New Needs. Evolution of giraffe. Aquatic Birds with Webbed Toes. Extinction of Limbs in Snakes. Flightless Birds. More items •21-Apr-2022