In the context of economically important organisms and the useful products they provide, which of the following pairs is mismatched?

Introduction / Context:
Biology based general knowledge questions often ask about economically important species and the products humans obtain from them, such as honey, silk, or lac. A popular exam pattern is to give a list of organism product pairs and ask you to spot the incorrect or mismatched pair. This question follows that pattern and checks whether you can distinguish the true producer of pearls from unrelated organisms that are important for other products like lac, honey, and silk.

Given Data / Assumptions:
- The question lists four organism product pairs and asks for the mismatched pair.
- The given pairs are:
- Pila globosa - pearl
- Kenia lacca - lac
- Apis indica - honey
- Bombyx mori - silk
- We assume that the intention is to test standard zoology facts about common commercial products.

Concept / Approach:
You need to recall which organisms actually produce pearl, lac, honey, and silk. Pearls are produced mainly by certain species of bivalve molluscs known as pearl oysters. Lac is a resinous secretion of a scale insect (Kerria lacca). Honey is produced by honey bees such as Apis indica. Silk is produced by the silkworm Bombyx mori. Pila globosa, however, is an apple snail and is not a pearl oyster. Therefore, connecting Pila globosa with pearl is incorrect, making that pair the mismatched one.

Step-by-Step Solution:
Step 1: Check the pair Pila globosa - pearl. Pila globosa is a freshwater apple snail, not a pearl oyster, so this seems suspicious. Step 2: Check the pair Kenia lacca - lac. The lac insect is commonly referred to as Kerria lacca, which secretes lac, a resin used in varnishes and shellac, so this pair is essentially correct in meaning. Step 3: Check the pair Apis indica - honey. Apis indica is a species of honey bee that produces honey and beeswax, so this is correct. Step 4: Check the pair Bombyx mori - silk. Bombyx mori is the domesticated silkworm used widely in sericulture to produce silken threads, so this pair is correct. Step 5: Since only Pila globosa is wrongly paired with pearl, identify Pila globosa - pearl as the mismatched pair.

Verification / Alternative check:
To verify, think of common textbook tables listing “useful animals and their products”. You will find lac insect and Kerria lacca grouped with lac, honey bees such as Apis indica associated with honey, and silkworm Bombyx mori with silk. For pearls, names such as Pinctada and other pearl oysters are mentioned, not Pila globosa. This cross check confirms that Pila globosa is not a standard pearl producer and that the pair is indeed mismatched.

Why Other Options Are Wrong:
- Kenia lacca - lac: Although the spelling might vary slightly from Kerria lacca, the intention is clearly the lac insect that produces lac, so the pair is conceptually correct, not mismatched.
- Apis indica - honey: Apis indica is a well known honey bee species used for honey production in many parts of Asia, so the organism and product match correctly.
- Bombyx mori - silk: Bombyx mori is the classic silkworm species whose cocoon threads are processed to obtain natural silk, so this pair is accurate.

Common Pitfalls:
A common trap is to be distracted by the slightly unusual spelling “Kenia lacca” and think that this is the mismatched pair, but conceptually it refers to the same lac insect associated with lac production. Another mistake is to assume that any mollusc or snail could be linked with pearl, without recalling that pearl oysters are specialized bivalves and not all molluscs produce commercial pearls. To avoid errors, focus on whether the basic biological relationship between organism and product is correct, rather than being misled by minor spelling variations.

Final Answer:
The mismatched organism product pair is Pila globosa - pearl, because Pila globosa is an apple snail and not a pearl producer.