Q.Conservation of biodiversity within their natural habitat is

Step 1. In-situ conservation is defined in the chapter as conservation of genetic resources through protection within the natural or man-made ecosystem in which the organism occurs — exactly matching 'conservation within their natural habitat' in the question.

Step 2. Ex-situ conservation (b) is the opposite: protecting selected rare plants/animals in places outside their natural homes, such as zoos and gene banks — so it does not match.

Step 3. 'In vivo' (c) and 'in vitro' (d) are laboratory/experimental terms describing whether a process occurs inside a living organism or in a controlled lab environment respectively; neither is a conservation-strategy term used in the chapter.

Match the question's phrase 'within their natural habitat' directly to the chapter's definition of in-situ conservation.

• Confusing the biology-lab terms in vivo/in vitro with the conservation-strategy terms in-situ/ex-situ.
• Reversing in-situ and ex-situ conservation.