Neck and fore limbs in African giraffe increased in length as a result of:
A.Variation in these organs
B.Mutations in these organs
C.Use and disuse
D.None of these
Category: Organic Evolution Theories Mcqs
Increase in the length of neck and fore legs in African giraffe was explained by Lamarck due to the fact that ancient giraffes stretched their neck and fore legs generation after generation and the character acquired as a result of use was inherited. Darwin also explained the phenomenon. Can you point out the way in which Darwin described it:
A.There was sudden mutation due to use and disuse and it lead to evolution in neck and fore legs
B.There was effect of temperature on these animals and as a result the change occurred
C.Only those members which had longer necks and fore legs were selected by nature
D.There were variations in population
Mutations are mainly respobsible for:
A.Variations in the organism
B.Constancy in the organism
C.Genetic continuity between parents and offsprings
D.Increase in the population rate
Greatest drawback of Darwin’s Theory was that it could not offer suitable explanation for:
A.Survival of fittest
B.Struggle for increase
C.Enormous fertility leading to over production
D.Variations
Neolamarckism states that:
A.There is enormous fertility in organisms but their number always remains constant
B.Like begets Like
C.All the beritable characters are carried by ‘genes’ which become incorporated in the genotype and are heritable
D.The life cycle of an individual repeats the characters which were present in its ancestors
According to the Theory of Continuity of Germplasm which was put forward by August Weismann:
A.The acquired characters of organisms that have passed to somatoplasm are inherited in their offsprings
B.The acquired character of organism which have passed only to germplasm are inherited in their offsprings
C.The acquired characters of organism that have passed only to somatoplasm and not to germplasm are inherited in their offsprings
D.The acquired characters of organism are inherited due to principle of recapitulation
Which of the following facts make Lamarckism doubtful:
A.Neck of giraffe elongated for grazing from high trees
B.Trees of high altitudes have sloppy branches to avoid deposition of snow
C.Deer is fast runner for protection from predators
D.Indian ladies have been getting their ears pierced since ages but pierced ears are not inherited
Which of the following facts Darwin and Wallace deduced from the observed fact Struggle for existence, variations and their transmission:
A.Structural modifications forming new species
B.Struggle for existence
C.Survival of fittest or natural selection
D.All of these
One of the evolutionary concept in Biology was projected by Darwin in his book Origin of Species. It has been discussed as:
A.Germplasm Theory
B.Theory of use and disuse of body parts
C.Theory of Natural Selection leading to Survival of Fittest
D.Theory of gene mutations
If a population of organisms is introduced into a new territory where environmental conditions are favourable to it, the population grows rapidly because of:
A.Increase rated of reproduction
B.Absence of predators
C.Unlimited food supply available
D.More survival of offsprings
