The historic convention on biological diversity held in Rio de Janeiro in 1992 is known as
CITES Convention
The Earth Summit
G-16 Summit
MAB Programme
What is common to the techniques
(i) in vitro fertilisation
(ii) cryopreservation
(iii) tissue culture?
All are in situ conservation methods.
All are ex situ conservation methods.
All require ultra modern equipment and large space.
All are methods of conservation of extinct organisms.
What characteristics make a community stable?
The characteristics that make a community stable are
(i) Less variation in productivity from year to year.
(ii) Resistance or resilience to occasional disturbances (natural or man-made).
(iii) Resistance to invasions by alien species.
What could have triggered mass extinctions of species in the past?
Nobody knows the real reason but the scientists believe that any one of the following could have triggered mass extinction of species in the past.
(i) Fall of sea levels.
(ii) Change in temperature (freezing or warming).
(iii) Asteroid/meteorite hitting the planet.
(iv) Poisonous hydrogen sulphide emissions from the sea.
(v) Nova/super nova/gamma ray burst.
(vi) Plate tectonics.
What accounts for the greater ecological diversity of India?
The greater ecological diversity of India is because of the geographical diversity in terms of varying topography, e.g., deserts, rain forests, mangroves, coral reefs, wetlands, estuaries and alpine meadows all are present in India. This results in building of different varieties of ecosystems with greater ecological diversity.