Question

Given below are two statements
Statement I: Rasping and sucking type mouth parts are present in Thrips
Statement II: Chewing and lapping type mouth parts are present in honey bees
In light of the above statements, choose the most appropriate answer from the options given below

• A. Both Statement I and Statement II are correct
• B. Both Statement I and Statement II are incorrect
• C. Statement I is incorrect but Statement II is correct
• D. Statement I is correct but Statement II is incorrect

Hint:

Thrips are characterized by asymmetrical rasping-sucking mouthparts (only the left mandible is functional), while honey bees use chewing-lapping mouthparts to chew wax and lap nectar.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Insects possess diverse mouthpart designs modified to feed on different food sources.
These modifications are used as diagnostic features in insect classification.

Step 2: Detailed Explanation:
Let us analyze both statements regarding mouthpart types:
1. Statement I: Rasping and sucking mouthparts are asymmetrical structures unique to the order Thysanoptera (thrips).
The right mandible is embryonic or vestigial, while the left mandible is modified into a sclerotized stylet.
During feeding, the insect rasps the plant surface with its single left mandible to damage the epidermal cells, then inserts its maxillary stylets to suck up the exuded sap.
Therefore, Statement I is correct.
2. Statement II: Chewing and lapping mouthparts are found in hymenopterans, primarily honey bees (Apis spp.).
These mouthparts feature well-developed, non-dentate mandibles used for chewing wax, manipulation, and defense.
The galeae of the maxillae and the labial palps are elongated and fit together around the elongated glossa (tongue) to form a tubular structure.
This tube is used to lap up or suck nectar from flowers.
Therefore, Statement II is correct.

Step 3: Final Answer:
Both Statement I and Statement II are correct.