Life Cycle of Cockroach
Anatomy of Earthworm,Cockroach & Frog of Class 11
Life cycle of cockroach is simple.
Copulation : Female secretes yellow coloured pheromones for attracting males. During copulation spermatophore of male is attached with spermatheca of female.
Fertilization : Fertilization takes place in female genital chamber. From 16 ovarioles, 16 ova are released, which are arranged in ootheca after fertilization.
Formation of ootheca : Secretion of collaterial glands form ootheca. Wall of ootheca is formed of scleroproteins.
Developement : Eggs are polylecithal, centrolecithal and cleidoic. Cleavage begins in ootheca. Cleavage is meroblastic and superficial. Within ootheca, 16 nymphs develop in 5 to 12weeks. Ootheca ruptures and nymphs are liberated.
Metamorphosis: In cockroach metamorphosis is paurometabolous or gradual metamorphosis. Metamorphosis is completed in about 2 years.
Ecdysone stimulates moulting or ecdysis. Juvenile hormone secreted from corpora allata regulates rate of growth and tissue differentiation. Moulting in nymph occurs 8 to 10 times.