Along with reduction in the number of toes in the modern horse, the other most significant evolutionary change is
increase in the size of eyes
increase in the size of brain
straightening of back
change in dentition from browsing to grazing
Correct Answer :
D. change in dentition from browsing to grazing
Related Questions
Appearance of ancestral characters in the new born, such as tail, monstral face, gill slits, multiple mammale etc. are known as
homologous
analagous
ativistic
vestigeal
A connecting link between Annelids and Arthropods is
Peripatus
Palaemon
Limulus
Heteronereis
The concept of use and disuse of organs was given by
Darwin
Wallace
Mendel
Lamarck
The book "Voyage of the Beagle" is concerned with which one of the following ?
Lamarckism
Theory of natural selection
Bird flight mechanisms
Both and
Fossilisation occurs where
animals are destroyed by environment
animals are destroyed by scavangers
animals are burried by natural " processes
organisms are burried and preserved by natural processes
Fossil Archaeopteryx was discovered and preserved as
a petrified specimen
a mineralised specimen
a mould
embedded in amber
Peking man is known as
Homo sapiens
Pithecanthropus
Sinanthropus
None of these
The first fossil man was
Australopithecus
Homo erectus
Sinanthropus
Ginganlo pithecus
A kind of mimicry which presumably works as a double insurance is
batesian mimicry
mullerian mimicry
warning colouration
concealing colouration
The first mammal arose
after the extinction of dinosaurs
before the origin of dinosaurs
along with dinosaurs
from the dinosaurs
The idea of spontaneous generation is essentially correct in regard to
origin of life
evolution
mutations
embryology
The function affected by point mutation in p-globin in sickle cell anaemia is
protein folding
transcriptional control
nonsense mutation
none of these
We use the term hybrid breakdown when the
offspring of hybrids are inviable or sterile
a hybrid zygote is formed but it fails to develop
hybrid adults fail to produce functional gametes
sperms and ova of different species of animals are unable to fuse
Geological evidence of most primitive mammals is found in
Centred Africa
China
India
Australia
Survival due to geographic isolation is best exemplified by mammalian fauna of
Oriental region
Ethiopian region
Australian region
Palaearctic region
Co-worker of Darwin was
Bateson
Mendel
Wallace
Lamarck
Connecting link between nonchordata and chordata is
Peripatus
Archaeopteryx
Tachyglossus
Balanoglossus
Fire was first used for protection and cooking by
Java man
Neanderthal man
Peking man
Cromagnon man
Which is a vestigeal organ of python
Nose
Scales
Teeth
Hindlimbs
The diploid number of chromosome in Chimpanzee, Gorilla and Orangutan is
2n = 44
2n = 46
2n = 48
none of these
Ontogeny recapitulates phylogeny is the statement relating to
morphology
physiology
taxonomy
embryology
The first life on earth came in water and evidences indicate that life originated in one of the following eras :
Paleozoic
Mesozoic
Cenozic
Proterzoic
Species were regarded as unchangeable by
Lamarck
Morgan
Charles Darwin
Many biologists of 19th century
An example of analogy is
wings of a bird and butterfly
wings of pigeon and bat
limbs of horse and man
paddles of dolphin and fins of a fish
The recent ancestors of modem man were
Java Ape and Peking man
Peking man and Rhodesian man
Cromagnon man and Rhodesian man
Cromagnon man and Neanderthal man
Some of the important evidences of organic evolution are
occurrence of homologous and vestigeal organs
occurrence of analogous and vestigial organs
occurrence of homologous and analogous organs
occurrence of analogous oragans only
Which animals dominated in Paleozoic era ?
Fishes
Amphibians
Reptiles
Birds
The earliest ancestor of horse from early Eocene period is
miobibbus
eohippus
merychippus
pliohippus
Doubis in 1891 found the fossil of Java ape man. It is
Sinanthropus pekinensis
Homoerectus
Homo rhodesiensis
Homo spisaens
Which of the following gases were absent in free form when life originated on earth?
Oxygen
Hydrogen
Methane
Ammonia