Followings are the features of a stable community
[A] Resistant or resilient to occasional disturbances (Natural or Anthropogenic)
[B] Not show much variation in productivity
[C] Resistant to invasion by alien species
[D] All of the above
There are two plots Plot’ 1′ has less species and Plot ‘2’ has more species. Which statement is true regarding the two plots?
[A] Plot ‘1’ shows less year to year variation in total biomass.
[B] Plot ‘2’ is less resistant to natural disturbance.
[C] Plot’ 1′ has more productivity than plot ‘2’.
[D] Plot ‘2’ has more productivity than plot’ 1′.
Rivet popper hypothesis was proposed by
[A] Robert May
[B] A. Von Humboldt
[C] Paul Ehrlich
[D] Edward Wilson
Tropical environments, unlike temperate ones, are
[A] Less seasonal
[B] Relatively more constant
[C] More predictable
[D] All of the above
Find the incorrect statement.
[A] Constant environment promote niche specialization.
[B] Key species are those which derive major ecosystem functions.
[C] Increase in diversity generally increases productivity.
[D] Increased steepness in species-area relationship curve decreases species richness in a given area.
The colonization of tropical Pacific Islands by humans led to extinction of more than, ______ species of native birds
IUCN Red list (2004) documents the extinction of how many species in last 500 years?
Match the Column-I (Recently extinct animals) with Column-II (Places from where they are extinct).
A. Dodo 1) Russia
B) Quagga 2) Australia
C. Thylacine 3) Africa
D. Steller’s sea cow___4) Mauritius
[B] A:4, B:3, C:2,D:1
[C] A:4,B:2, C:3,D:1
[D] A:4, B:1, C:2, D:3
Find the false statement.
(A) In the last 20 years alone there is a disappearance of 27 species.
(B) Three species (Bali, Javan and Caspian) of tiger are included in recently extinct animals.
(C) If we apply May’s estimate then there are probably more than 1,00,000 plant species in India that are yet to be discovered and described.
(D) There is more solar energy available in tropics, which contribute to higher productivity; this in turn contributes directly to greater diversity,
[A] A only
[B] C, D only
[C] B,D only
[D] A and C only
According to the IUCN Red list (2004) how many vertebrates became extinct in the last 550 years?
According to IUCN Red list (2004) how many invertebrates became extinct in the last 500 years?
Which group is most vulnerable to extinction?
Approximately how many species face the threat of extinction?
Presently ______ % of all bird species, ______ % of all mammals species, ______ % of all amphibian species and ______ % of all gymnosperm species in the world face the threat of extinction.
[D] 23, 12,32,81