S.6 Biology Cockroach Dissection Caltec S.6

A-Level Cockroach dissection questions -YK 1 COCKROACH ANATOMY (DISECTION) QUESTIONS 1. You are provided with specimen K, which is freshly killed. a) With the help of a hand lens, examine the head of the specimen. Using any four observable features on the head, explain how each of them enables the animal to survive in its habitat. (04mks) b) View the anterior part of the head using a hand lens. Draw and label. (11 mks) c) Cut off the head of the specimen then cut one eye with as little tissue under it as possible. Place the eye on the slide with the cut side facing downwards. View under the low power of a microscope. (i) Describe the arrangement of the eye units. (05 mks) (ii) Draw four adjacent eye uni ts. Do not label. (06 mks) (iii) What is the signi ficance of the arrangement of the units? (02 mks) d) With the dorsal side uppermost, dissect the specimen to remove the digestive system. Display the structures remaining on the ventral cuticle. Draw and label. (12mks) 2. You are provided with specimen K. a) Place the specimen ventral side uppermost and cut off its antennae limbs, observe the head and the first thoracic segment. Draw and label. b) Turn the specimen dorsal side uppermost and examine the wings when pulled outwards. Describe their structure. (i) Outer w ings. (ii) Inner wings. c) Cut off wings. Cut along the right lateral line of the body from the anterior part of the thorax up to the 8th segment. Turn the dorsal cuticle to the left and clear any fat tissues. Carefully displace only exposed structures on the vent ral cuticle. Draw and label your dissection showing; (i) All internal structures on both cuticles. (ii) Parts of the digestive system use for storage, …