Tag: evolution of life

Questions Related to evolution of life

As per Lamarck, well developed auricle muscles of rabbit have evolved due to

zoology evolution of life darwin's theory of evolution process of evolution lamarckism

  1. Continuous use

  2. Internal vital force

  3. New need

  4. All the above

Show answer
Correct Option: A
Explanation:

Lamarckism is the theory of acquired characters, it includes :

  • Internal vital forces. 
  • Effects of environment and new needs. 
  • Use and disuse of organs. 
  • Inheritance of acquired characters.

So, the correct option is 'Continuous use'

The scientist who first stressed on adaptation as a means of evolutionary modification was 

zoology evolution of life darwin's theory of evolution process of evolution lamarckism

  1. Huxley

  2. Weismann

  3. Charles Lyell

  4. Lamarck

Show answer
Correct Option: D
Explanation:

The first theory of evolution was proposed by Jean Baptiste de Lamarck. Lamarckism proposed

  • Some internal forces are present in all organisms. By the presence of these forces, the organism has the tendency to increase the size of their organs or the entire body.
  • Environment influences all type of organisms. Changing environment give rise to new needs. New needs or desires produce new structure and change habits of the organism.
  • If an organ is constantly used, it would be better developed whereas disuse of organ results in its degeneration.

So, the correct option is 'Lamarck'

Lamarckism cannot explain

zoology evolution of life darwin's theory of evolution process of evolution lamarckism

  1. Webbed toes in aquatic birds

  2. Weak muscles in the son of a wrestler

  3. Long narrow and limbless body of snakes

  4. Heterophylly

Show answer
Correct Option: B
Explanation:

Lamarck in his use and disuse theory proposed that any body part used vigorously caused it to become stronger and inherited in descendants. Lamarckism was failed to explain the reason behind weak muscles of wrestler’s son. Which was later on explained by August Weismann in his germ plasm theory. The germplasm theory claimed that only those changes would be inherited that affects germplasm (now called DNA) and any change in the body would not affect germplasm, so could not be inherited. Thus, the correct answer is ‘Weak muscles in the son of a wrestler.’

Choose the correct answers from the alternatives given.
Lamarck believed that certain parts of the body became more complex through the generations because they

zoology evolution of life darwin's theory of evolution process of evolution lamarckism

  1. are most similar to Gods perfection

  2. contribute to greater reproductive success

  3. are predetermined to do so

  4. are used more extensively than other parts

Show answer
Correct Option: D
Explanation:

Lamarck believed that evolution occurs when an organism uses a body part in such a way that it is altered during its lifetime and this change is then inherited by its offspring. For example, Lamarck thought that giraffes evolved their long neck s by each generation stretching further to get leaves. This theory was called the Use and Disuse of Organs.

Hence, the correct answer is 'are used more extensively that other parts'

According to Neo Darwinism, evolution is due to :

zoology evolution of life darwin's theory of evolution process of evolution lamarckism

  1. Gene flow

  2. Change in gene structure

  3. Change in size of gene pool

  4. Change in gene frequency

Show answer
Correct Option: D

The theory of natural selection was given by

biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

  1. Lamarck

  2. Alfred Wallace

  3. Charles Darwin

  4. Oparin and Haldane

Show answer
Correct Option: C
Explanation:
The characteristics that enable enable some organism to survive better than others in the same environment, are said to be selected by nature. Darwin use the phrase 'Natural selection' for this.
So, the correct option is 'Charles Darwin'

Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?

biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

  1. Overproduction, variations, constancy of population size, natural selection

  2. Variations, constancy of population size, over-production, natural selection

  3. Overproduction, constancy of population size, variations, natural selection

  4. Variations, natural selection, overproduction, constancy of population size

Show answer
Correct Option: C
Explanation:

Organisms tend to increase the number of offsprings in the individual for survival in number. Then the interspecific, intraspecific, extra specific struggle for existence occurs. Then small changes occur from the parent generation to the next progenies which acts as a raw material for a source of evolution. And nature selects the useful or adaptive variation.

So, the correct answer is 'Overproduction, the constancy of population size, variations, natural selection'.

Fitness according to Darwin refers to______________.

biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

  1. Number of species in a community

  2. Useful variation in population

  3. Strength of an individual

  4. Reproductive fitness of an organism

Show answer
Correct Option: D
Explanation:
According to Darwin's theory fitness refers to the Reproductive fitness of an organism because it describes the reproductive success of an individual which is measured as the number of offsprings produce by an individual with respect to specific genotype or phenotype. Fitness theory of Darwin doesn't depend on strength of an organism to survive but the ability of an organism to pass on its genetic material to its offsprings. 
So, the correct answer is 'Reproductive fitness of an organism'.

The ship used by Charles Darwin during his sea voyages was _____________.

biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

  1. HMS Beagle

  2. HSM Beagle

  3. HMS Eagle

  4. HSM Eagle

Show answer
Correct Option: A

Darwinism explains all the following except.

biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

  1. Offspring with better traits that overcome competition are best suited for the environment

  2. Variations may or may not be inherited from parents to offspring through genes

  3. Within each species, there are variations

  4. Organisms tend to produce more number of offspring than can survive

Show answer
Correct Option: B
Explanation:

The main drawback of Darwinism is lack of knowledge of heredity. Darwin's theory could not explain the inheritance of variations from parents to offsprings through genes.

So, the correct answer is 'Variations may or may not be inherited from parents to offspring through genes'.