Which of the following features is not present in Periplaneta americana?
Exoskeleton composed of Nacetylglucos amine
Metamerically segmented body
Schizocoelom as body cavity
Indeterminate and radial cleavage during embryonic development
Which of the following statements is incorrect?
Which is correct sequence for ootheca formation?
$(1)$ Ova enter into genital chamber
$(2)$ Cover around a fertilized eggs.
$(3)$ Ovum fertile by sperms.
Consider the following statements regarding cockroach and mark the correct option.
$(i)$ Head is formed by the fusion of $6$ -segments.
$(ii)$ Mouth parts are biting and chewing type.
$(iii)$ Crop is the part of mid gut.
Describe circulatory system of cockroach.
If the head of cockroach is cut off, it will still be alive for as long as one week. This is because of