AIIMS Zoology Evolution Class 12 Questions

Assertion : Heterospory and retention of female gametophyte are responsible for origin of seed habit in Selaginella

Reason: Psilotum is a living fossil

Hardy Weinberg equilibrium is affected by-

Assertion: Species are groups of potentially interbreeding natural populations which are isolated from other such groups.

Reason: Distinctive morphological characters are displayed due to reproductive isolation.

What was the reason for mass extinction during the Mesozoic era?

Which of the following explained evolution in most acceptable form?

Radioactive C⁻dating and living fossils are used for-

Reproductive isolation in sympatric speciation develops without a

From the statements given below, which one most likely represents an example of disruptive selection. I. Industrial melanism in peppered moth. II. Population of butterflies that are either all yellow or all blue. III. Population of rabbits that evolves more body fat in response to a cold climate. IV. Population of wrens that evolves to be smaller at sexual maturity in response to predation pressure.

The best description of natural selection is

The correct sequence of stages in the evolution of modern man (Homo sapiens), is

Which of the following is the relatively most accurate method for dating fossils?

Wings a pigeon, bat and mosquito shows

The extinct human ancestor, who ate only fruits and hunted with stone weapons was

Which of the following statements is correct?

Which of the following evidences does not favour the Lamarckian concept of inheritance of acquired characters?

The concept of chemical evolution is based on

Homo erectus evolved during

Assertion: Jave Ape-man, Peking man and Heidelberg man are the fossils of Homo erectus. Reason: Homo erectus evolved from Homo habilis.

"Homo sapiens" implies

Wings of pigeon, mosquito and bat show

Assertion (A): The earliest fossil form in the phylogeny of horse is eohippus.

Reason (R): Eohippus lived during the early pliocene epoch.

Assertion: The earliest organisms that appeared on the Earth were non-green and presumably anaerobes.

Reason: The first autotrophic organisms were the chemoautotrophs that never released oxygen.

Assertion : Human ancestors never used their tails and so the tail expressing gene has disappeared in them.

Reason : Lamarck's theory of evolution is popularly called theory of continuity of germ plasm.

Assertion : Comparative biochemistry provides a strong evidence in favour of common ancestry of living beings.

Reason : Genetic code is universal.

Assertion : Darwin's finches show a variety of beaks suited for eating large seeds, flying insects and cactus seeds.

Reason : Ancestral seed-eating stock of Darwin's finches radiated out from South American mainland to different geographical areas of the Galapagos Islands, where they found competitor-free new habitats.

A baby has been born with a small tail. It is a case exhibiting

Assertion : Coacervates are believed to be the precursors of life.

Reason : Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.

Assertion : Among the primates, chimpanzee is the closest relative of the present day humans.

Reason : The banding pattern in the autosome numbers 3 and 6 of man and chimpanzee is remarkably similar.

Assertion : From evolutionary point of view, human gestation period is believed to be shortening.

Reason : One major evolutionary trend in humans has been the larger head undergoing relatively faster growth rate in the foetal stage.

Assertion : Natural selection is the outcome of differences in survival and reproduction among individuals that show variation in one or more traits.

Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.

The cranial capacity was largest among the

Which of these are considered most essential in the origin of life?

Genetic drift operates only in:-

“They have raised cheek bones, oblique eyes and yellowish skin colours”. Here they refers to

One of the possible early sources of energy were/was

Assertion: Amphibians have evolved from fishes.

Reason: Take the example of the fossil Archaeopteryx.