Question
State the differences between in situ and ex situ conservation. Give two examples of each from India. Why do we need both approaches?
This question shows up almost every year in CBSE Class 12 boards and NEET — either as a 2-mark or 3-mark question. The marks are easy if you keep your examples India-specific.
Solution — Step by Step
In situ means “on-site” — we protect a species within its natural habitat. The organism stays in its ecosystem, with all its natural food, predators, and interactions intact.
Think of it as protecting a tiger in the wild, not moving it anywhere.
The two major categories are biosphere reserves and wildlife sanctuaries/national parks.
| Type | India Examples |
|---|---|
| National Parks | Jim Corbett (Uttarakhand), Kaziranga (Assam) |
| Wildlife Sanctuaries | Bharatpur Bird Sanctuary, Chinnar (Kerala) |
| Biosphere Reserves | Nilgiri, Sundarbans |
For exams, Jim Corbett (Project Tiger) and Kaziranga (one-horned rhinoceros) are the safest examples to cite.
Ex situ means “off-site” — the organism is removed from its natural habitat and protected in a controlled environment. We use this when the species is critically endangered or when its habitat is too damaged.
The trade-off: the animal is safe, but it loses its natural behaviour over generations.
| Type | India Examples |
|---|---|
| Zoological Parks (Zoos) | National Zoological Park (Delhi), Mysore Zoo |
| Botanical Gardens | Indian Botanical Garden (Howrah), Ooty |
| Seed Banks | National Bureau of Plant Genetic Resources (NBPGR), Delhi |
| Cryopreservation | Gametes of endangered species stored at -196°C |
NBPGR is a high-value NEET example — it stores seeds of wild relatives of crop plants.
In situ is the gold standard — species thrive best in their natural ecosystems. But when habitat destruction is severe (deforestation, urban expansion), ex situ acts as a safety net.
The IUCN calls this a complementary strategy: ex situ buys time while we work to restore habitats for eventual reintroduction.
Why This Works
Natural selection shaped every species to fit its ecosystem. When we protect an organism in situ, we’re preserving the entire web — soil microbes, pollinators, prey-predator balance, seasonal behaviour. A tiger in Jim Corbett isn’t just a tiger; it regulates the deer population, which in turn controls vegetation.
Ex situ conservation is essentially emergency medicine. When the gharial (Gavialis gangeticus) was down to 200 individuals in the 1970s, captive breeding programmes at Kukrail Gharial Rehabilitation Centre in Lucknow saved the species from near-extinction. You cannot wait for habitat restoration when a species is at that threshold.
The long-term goal is always reintroduction into the wild. Ex situ creates the genetic reservoir; in situ provides the home to return to.
Alternative Method — Memory Table for Quick Revision
For a 2-mark question, examiners want two clear columns. Memorise this contrast:
| Feature | In Situ | Ex Situ |
|---|---|---|
| Location | Natural habitat | Outside natural habitat |
| Example | National Park, Biosphere Reserve | Zoo, Botanical Garden, Seed Bank |
| Ecosystem preserved? | Yes | No |
| Suitable for | Species with viable habitat | Critically endangered species |
| Cost | Lower (protect the area) | Higher (maintain facilities) |
In NEET MCQs, a question will often name a specific conservation method and ask you to classify it. Remember: sacred groves (like Devarakadus in Karnataka) are in situ — they’re natural habitats protected by community tradition, not government parks.
Common Mistake
Students write “Botanical Gardens are in situ conservation because plants are growing there.” This is wrong. A botanical garden is an artificial, managed environment — the plants were brought there. In situ means the species is growing in its original, undisturbed natural habitat. A forest patch where wild plants grow naturally is in situ; a botanical garden is ex situ.
The same logic applies to aquaria (ex situ, not in situ) even though the fish are “in water.”
Final Answer:
- In situ conservation = protection within natural habitat → National Parks, Wildlife Sanctuaries, Biosphere Reserves (e.g., Jim Corbett, Kaziranga, Nilgiri Biosphere Reserve)
- Ex situ conservation = protection outside natural habitat → Zoos, Botanical Gardens, Seed Banks, Cryopreservation (e.g., National Zoological Park Delhi, NBPGR New Delhi)
- Both are needed: in situ preserves ecological function; ex situ serves as a genetic safety net for critically endangered species.