Advertisements
Advertisements
प्रश्न
Observe the following figure and explain the concept.
उत्तर
- The figure depicts the concept proposed by 'Lamarck'. Lamarck proposed that the activities of organisms are responsible for their evolution.
- This French naturalist proposed that each animal or plant undergo some changes in its life span and those changes are transferred to the next generation and such changes occur in the next subsequent generations too.
- The giraffe's neck has grown too long as a result of 'acquired characters'. For several generations, they have been browsing on the leaves of tall plants by extending their neck.
APPEARS IN
संबंधित प्रश्न
Write short notes based upon the information known to you.
Lamarckism
Survival of fittest : Darwin : : Acquired characters : ..............................
a) Explain in brief - Lamarck’s principle of ‘use or disuse of organs’.
b) Give two examples.
c) What are ‘acquired characters’?
The first scientist who proposed his theory for evolution was ______.
Briefly discuss Lamarckian Theory of Inheritance citing an appropriate example.
Explain the occurrence of vestigial organs on the basis of Lamarck's theory of use and disuse.
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:
Briefly mention why the changes shown in the two figures appeared.
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?
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?
The ‘use and disuse theory’ was proposed by ______.
The characters developed by the animals during their life time, in response to the environmental changes are called ______.
The use and disuse theory of organs’ was postulated by Charles Darwin.
