According to Ecologists and Evolutionary Biologists, the probable reason for speciation in tropics is not
Speciation is generally a function of time, more time without environmental disturbances better chance of speciation
No frequent glaciation unlike temperate regions in the past
Constant environment supports niche specialisation
Tropics had more adapted animals and had a high rate of reproduction so there is more diversity
……a… have remained relatively undisturbed for millions of years and thus had a long evolutionary time for……b..The constant environments promote…c..and had a greater species diversity.
Which of the following is correct?
a-Tropical latitudes
b-niche specialization
c- species diversity
b- constant environment
The higher diversity of tropics is actually favoured by all except
High solar energy
Constant and predicatable environment
No environmental disturbances like glaciations
Animals with high reproductive rates
Alexander Von Humboldt:
Find the wrong one out.
German Naturalist
German Geographer
First one to explore South American Jungles
Gave Rivet Popper Hypothesis
The idea of Species Area Relationship was given by
Edward Wilson
Paul Ehrlich
A.V. Humboldt
Katherine Esau
According to Species-Area relationship-
(1) Within a region, species richness increased with increasing explored area, but only up to a limit
(4) Both and (2)
Within a region, species evenness increased with an increasing explored area without limit
Within a region, species diversity increases with increasing area.
For which of the following the relationship between species richness and area turn out to be rectangular hyperbola?
Gymnosperms
Pteridophytes
Marine Fishes
Bats
The graph for species-area relationship is actually plotted between
Species richness and area
Species evenness and area
Species diversity and area
Species diversity and space
On a logarithmic scale, the relationship of species richness and area is a straight line described by the equation
logS= logC+logZ
logS= logZ+logA
logS= logC+ZlogA
logS= logZ+ClogA
. logS= logC+ZlogA
What would be the equation for rectangular hyperbola?
Note: the information in brackets actually defines the superscript in each option.
S=C^ZA
S=C A^Z
S=Z A^C
S=Z^A C
. logS= logC+ZlogA
Find the wrong one.
S= Species diversity
A= Area
Z= regression coefficient
C=Y intercept
In the logarithmic equation of species area relationship, The Z implies except
Slope of the line
Regression Coefficient
Y intercept
Value generally 0.1-0.2
The value of Z depends upon
(2) Different Regions
Type of taxonomic group
(4) Both and (3)
Area
Which of the following pairs will have Z value in between 0.1 to 0.2?
Birds of California and frugivorous birds of tropical forests
Birds of California and Molluscs in New York state
Molluscs in New York state and Frugivorous birds of tropics forests
Molluscs in New York state and mammals in tropical forests
If Z value is found to be 1.15, which of the following species richness was actually studied?
Frugivorous birds in the tropical Forests of different continents
Plants in Britain
Birds in California
Molluscs in New York state
If Z value is in between 0.6 to 1.2,This implies
Steeper slope
More towards the horizontal axis
The value of species richness decreases must faster than the area explored
Plants of Britain can have this value
If the area explored is the entire continent, then the slope of the line for species-area relationship would be
(2) Much reasonable
Much gentle
(4) Both and (3)
Much steeper
Who among the following gave tentative answers to the question that how do the attributes of a stable community are linked to species richness in a community?
Paul Ehrlich
David Tilman
A V. Hamboldt
Edward Wilson
Which of the following is not an attribute of stable community?
Resistant to occasional disturbances
Resistant to invasions by alien species
Resilient to occasional disturbances
High productivity with great variation year to year
Rich biodiversity is not important for
(1) Healthy ecosystem
(4) Both and (2)
Survival of human race on this planet
Alien species
Paul Ehrlich
Which of the following is wrong about him?
Stanford Ecologist
Rivet Popper Hypothesis
Importance of species actually affects the extent of stability of ecosystem
Worked on Outdoor plots for the apology he proposed
David Tilman actually proposed that
The long term ecosystem experiments using out door plots with less species showed less year to year variation in total number
The long term ecosystem experiments using out door plots with more species showed less year to year variation in total biomass
The long term ecosystem experiments using out door plots with more species showed more year to year variation in total number
The long term ecosystem experiments using indoor plots with less species showed less year to year variation in total biomass
According to Rivet Popper Hypothesis, which of the following is not correct?
Airplane: ecosystem
Rivets: species
Popping a rivet: causing a species to become extinct
Flight safety: number of species
Which of the following loss of rivet will be more crucial for the flight safety?
Loss of rivets on the wings
Loss of rivets on the seats
Loss of rivets on Windows inside the plane
Both A and C
Which of the following is not correct according to analogy given by Paul Ehrlich?
Loss of the key species that drive the major ecosystem functions is a more serious threat to flight safety than loss of other less important species
Proper functioning of ecosystem is initially may not be affected by species loss
Over a period of time, if the species loss is continuous, the ecosystem gets affected after a time
Even the loss of not much significant species lead to crtical damage to ecosystem.
The colonisation of tropical Pacific Islands by humans is said to have led to the extinction of more than
5000 species of native birds
2000 species of native birds
1500 species of mammals
3500 species of mammals
Which of the following data is not according to IUCN Red List (2004)?
Vertebrates-338
Invertebrates-359
Plants-87
Bacteria-104
The extinctions of 784 species recorded in IUCN Red List (2004) happened over
Last 240 years
Last 500 years
Last 300 years
Last 400 years
Which of the following is wrongly matched recent extinction?
Dodo-Mauritius
Quagga-Africa
Thylacine-Australia
Steller's Sea Cow- Stanford
Which of the following is not recently extincted subspecies of tiger?
Bali
Javan
Caspian
Sumata