'Invasive Species Specialist Group' (that develops Global Invasive Species Database) belongs to which one of the following organizations?

Answer: (a) The International Union for Conservation of Nature

The ISSG is part of IUCN’s Species Survival Commission and runs the Global Invasive Species Database.

The idea

IUCN does its science through expert commissions of volunteer scientists. The largest is the Species Survival Commission. Inside it are more than a hundred specialist groups, one for each group of species or problem (cats, crocodiles, invasive species). So any “Specialist Group” in a question points to IUCN.

A species is carried to a new region → No natural enemies there → It spreads fast → Native species lose food and space → The specialist group records it in the Global Invasive Species Database

Why the others are wrong

(c) The World Commission on Environment and Development (Brundtland) was a 1983–87 commission, now dissolved.

Also know

The group also publishes the list “100 of the World’s Worst Invasive Alien Species”. Well-known invasive species in India: lantana, parthenium (congress grass), water hyacinth and Prosopis juliflora (vilayati kikar). Invasive alien species are one of the main causes of biodiversity loss, along with habitat loss, over-use, pollution and climate change.