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प्रश्न
Observe the picture and answer the following questions.
- The given picture indicates which principle?
- Explain that principle in your language.
- What is the meaning of acquired characteristics?
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उत्तर
- The given picture indicates Lamarckism or inheritance of acquired characters.
- Lamarckism or inheritance of acquired characters:
i. Lamarckism is the theory of inheritance of acquired characters from one generation to another, given by Jean-Baptiste Lamarck.
ii. It states that the morphological changes occurring in living organisms are responsible for evolution. This concept was based on the principle of use and disuse of organs.
iii. Morphological changes may occur gradually, either due to specific activities or laziness of a particular organism.
iv. For e.g. Browsing on leaves of tall plants caused the neck of the giraffe to become long; frequent hammering movements cause the shoulders of ironsmith to become strong; inactivity caused weakening of the wings of birds like emu; legs of swans and ducks have become useful for swimming due to living in water; due to burrowing habits, snakes have lost their legs; etc. - Modification in structure or function acquired by an organism during its life, caused by environmental factors is known as acquired character.
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संबंधित प्रश्न
Write a short note based on the information known to you.
Lamarckism
Mention the two principles through which Lamarck explained his ideas.
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:
Give the common name and the scientific name of the insect involved in this phenomenon.
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.
What is inheritance of acquired characters?
The use and disuse theory of organs’ was postulated by Charles Darwin.
The degenerated wing of a kiwi is an acquired character. Why is it an acquired character?
Observe the following figure and explain the concept.
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?
In which work and year was Lamarck's theory of evolution published?
According to the postulate on the 'Formation of New Organs', a new organ develops in response to which factor?
Under the postulate of 'Inheritance of Acquired Characters', how are traits or modifications acquired during an organism's lifetime transmitted to its offspring?
Which environmental change did Lamarck cite as driving the evolution of the horse?
In the evolution of the horse, the shift from being flat-footed to running on hooves corresponds to which specific change?
