Rose chafer: internal structure
The rose chafer eats flowers, young leaves and unripe fruit: it tears with its upper jaws and crushes with its lower jaws (chewing mouthparts). The digestive tract: mouth, pharynx, gullet, muscular stomach, intestine and anus. Insects that feed on liquids have a proboscis-like mouth (sucking or piercing-sucking). Circulation is open; the heart is a tube on the back of the abdomen and the blood does not carry oxygen in breathing. Breathing is by tracheae: air enters through openings mainly on the sides of the abdomen and reaches every organ along branching tubes. The excretory organs, the Malpighian tubules, open into the intestine. The nervous system is a ring around the pharynx and a ventral nerve cord, with a brain formed in the head; it is highly developed in bees and ants. Insects sense colour, smell (some moths from 11 km) and taste well; crickets and similar insects have sound-producing and hearing organs.
Draw a diagram: “Air → opening → trachea → cells”. With a lens look for the breathing openings on a dried specimen (with the teacher). Safety: stay away from live bees and nests.