Question

According to Lamarck the intense use of organ results in its
A. Decreased size
B. Development
C. Extinction
D. None of the above

Answer 1

According to Lamarckism the theory of evolution is based on retaining the concept that acquired characteristics are inherited. Such as, the theory that evolutions result from the action of natural selection upon acquired characters and the evolutionary change is the direct product of the interaction of organism and environment.

Complete answer:
The French zoologist Jean-Baptiste Lamarck proposed the theory that the evolution of life had formed but driven by the use and disuse of the organs. According to this theory, all the physical changes that occurred during the lifetime of an individual are inherited to its offsprings.
Lamarck said that the frequent use of an organ by the organism develops them and opposite to that they seldom use an organ is lost in the succeeding generations. He gave the examples of giraffes who stretched his neck to eat leaves on the tall tree had to adapt by elongation of their necks and passed on this acquired character of elongated neck to succeeding generations. Giraffes, slowly over the years came to acquire long necks.
According to Lamarck, the organisms get influenced by the environmental changes, the small change brings the change in the organisms, which produces the new structures or changes the habit of the organisms. Few examples of Lamarckism are as follows-
The duck, an aquatic animal is believed to have evolved from the terrestrial animal.
The snakes are believed to have evolved from the lizard-like ancestor that has two pairs of limbs.
Ostrich were able to fly but due to the availability of enough food and protection they stopped using their wings and as a result, their wings became vestigial.
According to Lamarck the intense use of the organ results in its development.

So, option B is the correct answer.

Note: The major drawbacks of Lamarckism are there were no experimental proof of the theory. There were no possibilities for the transmission of the acquired characters. According to Lamarckism “natural tendency toward perfection” was not explained.