Biology

A cockroach is being an insect posse an open circulatory system. They are equipped with an open type circulatory system. Blood vascular system of cockroach…

The alimentary canal present in the body cavity is divided into three regions: foregut. midgut and hindgut (Figure). The mouth opens into a short tubular…

The adults of the common species of cockroach, Periplaneta americana are about 34-53 mm long with wings that extend beyond the tip of the abdomen…

Cockroaches are brown or black bodied animals that are included in class Insecta of Phylum Arthropoda. Bright yellow, red and green coloured cockroaches have also…

The vacuum part found within the cytoplasm is called cell vacuole. Characteristics: (i) In immature cells, vacuoles are numerous and minute, but in matured cells,…

The coiled thread-like structures suspended in the nucleoplasm is called chromatin fiber. A single coiled thread is called a chromosome. It is located in the…

The dense and round part present in the nucleus is called nucleolus. Scientist Fontana in 1781 first observed it. Structure: It is made of protein,…

Sensory system does not have eyes but does possess light and touch sensitive organs (receptor cells) to distinguish the light intensities and to feel the…

The nervous system of the earthworm is basically represented by ganglia arranged segment wise on the ventral paired nerve cord. The nerve cord in the…

Earthworms have a pair of excretory organs called nephridia in almost all segments. The excretory organs occur as segmentally arranged coiled tubules called nephridia (sing.:…