Question

Mark the incorrect statement for cockroach
A.Nymph undergoes 3-4 moults to reach adult form
B. Spermatophore is the bundle of sperm discharged during copulation.
C. Each ootheca has 15-16 eggs.
D. Its development is paurometabolous.

Answer 1

Hint: Cockroach is a terrestrial organism as well as omnivorous insect under phylum arthropoda. In cockroaches, paurometabolous or commonly known as gradual metamorphosis development takes place and cockroaches do have spermatophores for mating. Oxygen is absorbed passively through the moist skin and it feeds on food grains and even other animals.

Complete step-by-step answer:

The correct option is nymph undergoes 3-4 mouths to reach adult form.

1. A protective packet that contains a bundle of sperms is known as spermatophore and these are generally a male reproductive structure. Some accessory glands help in secreting structural proteins that are necessary for the construction of spermatophores. And with the help of spermatophores, many insects transfer sperm to females. So, in cockroaches also, spermatophores are discharged during copulation.

2. Ootheca is a sort of egg case, secreted by female cockroaches, commonly known as ootheca and each ootheca contains 15-16 eggs. It is enveloped by a protein substance that slowly hardens into a strong and protective casing. The species of some cockroaches drop the egg case while some other species carry the egg case with them until the eggs get ready to hatch.

3. Paurometabolous or also known as gradual metamorphosis is the development present in cockroaches in which immature stages look similar to the small adults. So, the nymph undergoes 13 moults to become adult form.

Therefore, Option ‘A’ is correct

Note: Person should have insights regarding phylum Arthropoda as well as should be aware of the concept of classification of animals including all phylum, classes, and families.