Question:
Given below are two statements
Statement I: In an insect, the anterior margin of the wing is called the coastal margin
Statement II: In an insect the angle at the base of the wing is called the humeral angle
In light of the above statements, choose the most appropriate answer from the options given below
Given below are two statements
Statement I: In an insect, the anterior margin of the wing is called the coastal margin
Statement II: In an insect the angle at the base of the wing is called the humeral angle
In light of the above statements, choose the most appropriate answer from the options given below
Statement I: In an insect, the anterior margin of the wing is called the coastal margin
Statement II: In an insect the angle at the base of the wing is called the humeral angle
In light of the above statements, choose the most appropriate answer from the options given below
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To remember wing terminology, associate margins with veins (costal margin is anterior) and angles with locations (humeral angle is at the base near the humeral crossvein).
Updated On: Aug 7, 2026
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is incorrect but Statement II is correct
- Statement I is correct but Statement II is incorrect
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Insect wings are flat, membranous structures supported by a network of sclerotized veins.
To describe wing morphology and venation patterns, entomologists use standard terms for the margins, angles, and regions of the wing.
Step 2: Detailed Explanation:
Let us analyze the boundaries and orientation of a generalized insect wing:
1. Wing Margins: A typical triangular insect wing has three main margins:
- Costal margin (anterior margin): This is the leading edge of the wing during flight, which is reinforced by the costal vein.
- Apical margin (outer margin): This is the margin opposite to the body attachment, extending from the wing tip downward.
- Anal margin (posterior or inner margin): This is the trailing edge of the wing nearest to the body.
Therefore, Statement I, which refers to the anterior margin as the costal (coastal) margin, is correct.
2. Wing Angles: A typical insect wing has three main angles:
- Humeral angle: This is the angle located at the anterior base of the wing, near the body attachment along the costal margin.
- Apical angle: This is the angle located at the apex or tip of the wing.
- Anal angle: This is the angle located posteriorly between the outer and inner margins.
Therefore, Statement II, which identifies the angle at the anterior base of the wing as the humeral angle, is correct.
Step 3: Final Answer:
Both Statement I and Statement II are correct.
Insect wings are flat, membranous structures supported by a network of sclerotized veins.
To describe wing morphology and venation patterns, entomologists use standard terms for the margins, angles, and regions of the wing.
Step 2: Detailed Explanation:
Let us analyze the boundaries and orientation of a generalized insect wing:
1. Wing Margins: A typical triangular insect wing has three main margins:
- Costal margin (anterior margin): This is the leading edge of the wing during flight, which is reinforced by the costal vein.
- Apical margin (outer margin): This is the margin opposite to the body attachment, extending from the wing tip downward.
- Anal margin (posterior or inner margin): This is the trailing edge of the wing nearest to the body.
Therefore, Statement I, which refers to the anterior margin as the costal (coastal) margin, is correct.
2. Wing Angles: A typical insect wing has three main angles:
- Humeral angle: This is the angle located at the anterior base of the wing, near the body attachment along the costal margin.
- Apical angle: This is the angle located at the apex or tip of the wing.
- Anal angle: This is the angle located posteriorly between the outer and inner margins.
Therefore, Statement II, which identifies the angle at the anterior base of the wing as the humeral angle, is correct.
Step 3: Final Answer:
Both Statement I and Statement II are correct.
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