Question

Proventriculus is rudimentary or absent in:

• A. Homoptera
• B. Lepidoptera
• C. Coleoptera
• D. Orthroptera

Hint:

The proventriculus acts as a grinding organ (gizzard). It is highly developed in solid feeders (Coleoptera, Orthoptera) and absent or rudimentary in liquid feeders (Lepidoptera).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The proventriculus (or gizzard) is a specialized muscular region of the insect foregut (stomodeum) located between the crop and the midgut.
Its development is closely correlated with the insect's diet and feeding habits.

Step 2: Detailed Explanation:
- Insects that consume solid food (such as Coleoptera and Orthoptera) possess a highly developed proventriculus.
This organ contains internal chitinous teeth, ridges, or spines that grind solid food particles before they enter the midgut for chemical digestion.
- In contrast, insects that feed exclusively on liquid diets do not require a grinding organ.
Adult Lepidoptera (butterflies and moths) feed on liquid nectar using siphoning mouthparts.
As a result, a grinding organ is unnecessary, and the proventriculus is rudimentary or completely absent in this order.
Therefore, the proventriculus is rudimentary or absent in Lepidoptera.

Step 3: Final Answer
The correct option is (B).