The 'devonian period' is considered to be as

  • age of fishes

  • age of amphibians

  • age of reptiles

  • age of mammals.

The random changes in the allele frequency occurring by chance is termed as

  • genetic variability

  • genetic drift

  • gene migration

  • mutation

The first living organisms that appeard on the planet, according to the most accepted

view, were

  • anaerobic

  • aerobic

  • photosynthetic

  • none of the above

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

  • Enzymes

  • Nucleic acids

  • Carbohydrates

  • Proteins

Genetic drift operates only in

  • island population 

  • smaller population 

  • larger population

  • none of these.

The cranial capacity was largest among the 

(a) Peking man               (b) Java ape man

(b) African man              (d) Neanderthal man
  • 1
  • 2
  • 3
  • 4

The early-stage human embryo distinctly possesses

  • gills                             

  • gill slits

  • external ear (pinna)       

  • eyebrows                             

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

  • retrogressive evolution

  • mutation 

  • atavism

  • metamorphosis.

Potato and sweet potato 

  • have edible parts which are homologous organs

  • have edible parts which are analogous organs

  • have been introduced in India from the same place

  • are two species of the same genus.

"Homo sapiens" implies

  • Human race

  • Human beings

  • Modern man

  • None of these

Wings of pigeon, mosquito and bat show

  • divergent evolution 

  • atavism

  • convergent evolution 

  • all of these 

Homo erectus evolved during

  • pleistocene           

    (2) miocene

  • 2

  • pliocene                 

    (4) holocene

  • 4

Which of the following postulates is related with Neo-Darwinism?

  • Mutations are believed to help form new species.

  • It incorporates isolation as an essential component of evolution.

  • It can explain the occurrence of unchanged forms over millions of years.

  • All of the above.

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

  • Absence of limbs in snakes

  • Melanization in peppered moth

  • Presence of webbed toes in aquatic birds

  • Lack of pigment in cave-dwelling animals 

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

  • Ramapithecus

  • Australopithecus

  • Dryopithecus

  • Homo erectus

In Miller's experiment, he used a mixture of CH4, NH3, H2 and water vapour in a closed flask to mimic early earth conditions. What was the temperature at which this flask was kept?

  • () 800°C

  • () 1200°C

  • () 200°C

  • () 400°C

Which of the following is reptilian ancestor of birds?

  • Hesperornis

  • Ichthyornis

  • Archaeopteryx

  • Lycaenops

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

  • Homo erectus, Australopithecus, neanderthal man, cro-magnon man, modern man

  • Australopithecus, Homo erectus, neanderthal man, cro-magnon man, modern man

  • neanderthal man, Australopithecus, cro-magnon man, Homo erectus, modern man

  • Australopithecus, neanderthal man, cro-magnon, Homo erectus, modern man

Documented microfossils have been found that are as old as

  • 2.5 billion years

  • 3.5 billion years

  • 1.5 billion years

  • 2.5 billion years

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 rabits 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.

V. Very tall and very short pine trees being removed from a population by herbivorey.

  • Only II                             

  • II and III

  •  Only IV                             

  •  III and IV        

The best description of natural selection is 

  • the survival of the fittest

  • the struggle for existence 

  • the reproductive success of the members of a population best adapted to the environment

  • a change in the proportion of variation within a population 

Reproduction isolation in sympatric speciation develops without a 

  • Geographic barrier

  • Barrier to gene flow

  • Change in chromosome number

  • Barrier to mating

Which of the following sets do not have homologous organs? 

  • Mouth parts of cockroach and butterfly

  • Wings of butterfly and bird

  • Wings of mosquito and butterfly 

  • Forelegs of horse and paddles of whale

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

  • Pottasium-argon method

  • Uranium-lead method

  • Electron-spin resonance method

  • Radio-carbon method

At a particular locus, frequency of 'A' allele is 0.6 and that of 'a' is 0.4. What would be the frequency of heterozygotes in a randomly mating population of equilibrium ?

  • 0.16

  • 0.36

  • 0.48

  • 0.24

Speciation of sympatric species is due to

  • geographic isolation

  • reproductive isolation

  • isolation/separation

  • migration

Flame cells and Malpighian tubules are the analogous organ in 

  • insects and arthropods respectively 

  • arthropods and echinodermates respectively

  • helminths and arthropods with other insect respectively

  • arthropds and other insect with helminths respectively

Tendrils in plants are an exapmle of 

  • Convergent evolution

  • Radiation

  • Divergent evolution

  • Co-evolution 

Basis of life are 

  • nucleic acids

  • proteins

  • nucleoproteins

  • amino acids

Theory of 'Saltations' was given by 

  • G Mendel

  • Hugo de Vries

  • J B S Haldane

  • H J Miller

0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Zoology Quiz Questions and Answers