Ex Situ Conservation
உயிரிடத்திற்கு அப்பாற்பட்ட பாதுகாப்பு
Nature does not wait for your revision. When a species reaches the brink of extinction, In Situ conservation is no longer an option. Ex Situ is the last line of defense against permanent genetic loss.
The idea
Ex Situ conservation involves placing threatened plants and animals in special settings outside their natural habitats. This includes zoological parks, botanical gardens, and wildlife safari parks. Modern techniques like cryopreservation (using liquid nitrogen at -196°C) and tissue culture are critical for preserving gametes and embryos. These methods ensure the survival of species that cannot thrive in the wild.
Why it matters
It provides a safety net for species facing a high risk of extinction in the wild where immediate intervention is required.
NEET lens
NEET focuses on the distinction between In Situ and Ex Situ. Memorize the list: Botanical gardens, zoological parks, seed banks, and cryopreservation are strictly Ex Situ. Do not confuse Sacred Groves or Biosphere Reserves with Ex Situ. Expect a matching-type question or a 'Which of the following is not' format.
Clinical significance
Genetic diversity is the biological equivalent of a robust immune system. When we lose species, we lose potential medicinal compounds and genetic blueprints that could treat future pandemics. Ex Situ banks act as a 'biological pharmacy' for humanity's future survival.
Introduction
In ex situ (off site) conservation, threatened animals and plants are taken out from their natural habitat and placed in special settings where they can be protected and given special care.
Core concept
Examples (NCERT): zoological parks, botanical gardens, wildlife safari parks and seed banks. Many animals that have become extinct in the wild continue to be maintained in zoological parks. In recent years ex situ conservation has advanced beyond keeping threatened species: gametes of threatened species can now be preserved in viable and fertile condition for long periods using cryopreservation techniques; eggs can be fertilised in vitro, and plants can be propagated using tissue culture methods. Seeds of different genetic strains of commercially important plants can be kept for long periods in seed banks.
Go deeper
Ex situ methods are a safety net, but they cannot fully replace protecting species in their natural habitat.
From Class 10
Keeping rare animals in zoos or storing seeds of rare plants in seed banks is ex situ conservation.