Question

(7) Lamarckism.
Ans.() Lamarckism consists of two theories
which were proposed by Jean Baptiste Lamarck,
These are as follows: (a) Use and disuse of the organs
(b) Inheritance of acquired characters.
(2) In theory of use and disuse of organs, Lamarck
ways: The characters of organs develop because
specific activities that the organisms perform. If
such organ is not used it gets degenerated. Thus the
morphological changes take place due to activities
or laziness of a particular organism.
(3) To emphasise this theory, he quoted following
examples. Due to constant extension of neck to eat
foliage from the top of the trees, giraffe's neck became
long. Similarly blacksmith has strong arms due to
constant work. He further adds that flightless ostrich
and emu did not fly and hence their wings became
useless. Aquatic birds like swan and duck made
their feet suitable for swimming by living in water,
Snake lost limbs as it tried burrowing mode.
(1) Such acquired characters are passed from one
parental generation to the offspring. This is called
inheritance of acquired characters.
(5) The theory of inheritance of acquired
haracters is not accepted as such transmission of
acquired character does not take place. Only genetic
haracters are transmitted,
(8) Speciation​

Answer 1

Answer:

(1) Such acquired characters are passed from one

parental generation to the offspring. This is called

inheritance of acquired characters.

(5) The theory of inheritance of acquired

haracters is not accepted as such transmission of

acquired character does not take place. Only genetic

haracters are transmitted,

(8) Speciation