Question

The reduction of mandibles in insects is a type of ............... variation.

• A. Allometric
• B. Climatic
• C. Parasitic induced
• D. Physiological

Answer 1

The correct option is A Allometric

Allometry is the relation of size of an organism to the aspects of its morphology, physiology and life history. There may be many reasons for the change in shape of an organism in the evolution period. For example, mandibles in insects which got reduced with the period of time. Mandibles (jaws) are very important for insects. With the change in food eating habits, mandibles got reduced as per the change in their functions. For example, when insects ate hard food mandibles were needed but as the insects changed the food habits, mandibles got reduced.

So, the correct answer is A.