Advertisements
Advertisements
प्रश्न
Given alongside are two figures (A and B) showing a phenomenon that was first observed in Manchester before and after the year 1850.
Answer the following:
The following phenomenon provides a classical explanation of a scientific theory given by a certain scientist.
(i) Name and explain the said theory.
(ii) Give the name of the scientist who gave this theory.
Advertisements
उत्तर
- Natural selection: During the struggle for existence, only individuals with advantageous variations survive, while those who lack these variations are wiped out. Nature selects only those variations which are suitable for existence. This process is called natural selection.
- Charles Darwin proposed the idea of natural selection.
संबंधित प्रश्न
Survival of fittest : Darwin : : Acquired characters : ..............................
Mention the two principles through which Lamarck explained his ideas.
Explain the occurrence of vestigial organs on the basis of Lamarck's theory of use and disuse.
What is inheritance of acquired characters?
The use and disuse theory of organs’ was postulated by Charles Darwin.
The theory proposed by Lamarck is ______.
Observe the figure given below and answer the questions that follow:
- What is the figure depicting?
- What was the reason that the giraffe stretched their neck and forelimbs?
- What is the name of the theory that is being depicted in the figure?
- Who explained the theory?
- What is the conclusion of this theory?
Under the postulate of 'Inheritance of Acquired Characters', how are traits or modifications acquired during an organism's lifetime transmitted to its offspring?
In the evolution of the horse, the shift from being flat-footed to running on hooves corresponds to which specific change?
A newborn rat in Weismann's experiment was born with a normal tail even though its parents' tails had been cut off. This outcome directly contradicts which postulate of Lamarckism?
