Chapter 29, Problem 2STP

Summary Introduction

Introduction:

The given figure shows life cycle of two insects. One depicts the complete metamorphosis where the insect goes through a series of changes in body structures as it develops from an egg into an adult. There are four stages of development; egg, larva, pupa and adult. The adult insect bears very little resemblance to its juvenile stage. The other insect shows incomplete metamorphosis in which the insect goes through only three stages of development; egg, nymph and adult.

Answer to Problem 2STP

Correct answer:

The correct answer is option A. 1, 5

Explanation of Solution

Explanation/justification for the correct answer:

Option A. 1, 5 −The stages 1 and 5 represent the first stage in the life cycle of an insect, the egg stage. Both the insects have this stage common to them. Insects begin life as a fertilized egg. The egg hatches either into a nymph (incomplete metamorphosis) or a larva (complete metamorphosis).

Hence this is the correct option.

Explanation for incorrect answer:

Option B. 2, 7 −The stage 2 is a nymph stage of an insect that undergoes incomplete metamorphosis whereas stage 7 is the pupa stage of the insect undergoing complete metamorphosis. Both stages are different.

Hence this is not the correct option.

Option C. 3, 8- The stage 3 is the advanced nymph stage of an insect that undergoes incomplete metamorphosis whereas stage 8 is the adult stage of the insect undergoing complete metamorphosis. Both stages are different.

Hence this is not the correct option.

Option D. 4, 7− The stage 4 is an adult stage of an insect that undergoes incomplete metamorphosis whereas stage 7 is the pupa stage of the insect undergoing complete metamorphosis. Both stages are different.

Hence this is not the correct option.