Evaluate Basic External Animal Anatomy and Morphology - AgriSETA
Evaluate Basic External Animal Anatomy and Morphology - AgriSETA
Evaluate Basic External Animal Anatomy and Morphology - AgriSETA
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<strong>Evaluate</strong> <strong>Basic</strong> <strong>External</strong> <strong>Animal</strong> <strong>Anatomy</strong> <strong>and</strong> <strong>Morphology</strong>Primary Agriculture NQF Level 1 Unit St<strong>and</strong>ard No: 11617332 HabitatLocusts are l<strong>and</strong> living insects. They feed on green plants <strong>and</strong> can causegreat damage when they form big swarms.A swarm consists of very large numbers of locusts. Body divisionThe body can be divided into three definite regions:• The head• The thorax <strong>and</strong>• The abdomen. The exoskeletonThe body wall is the exoskeleton, which consists mainly of a waterproof,non- elastic substance called chitin. The exoskeleton is thin <strong>and</strong> hardexcept in a few specific places, namely between the segments of theabdomen <strong>and</strong> in the leg joints. Movement is possible at these points.Because the exoskeleton is non-elastic, the locust has to moult (shed) inorder to grow. The headThe head is oval in shape <strong>and</strong> has the following features:• The antennae (feelers)At the top of the head in the front is a pair of feelers.They serve as organs of touch <strong>and</strong> smell.• The eyesTwo large, compound eyes are very conspicuous: there is one on eitherside of the head. They enable the animal to distinguish between light<strong>and</strong> darkness <strong>and</strong> more importantly to see moving objects.Three simple eyes look like small black spots between the compoundeyes - one on each side (above the base of each feeler), <strong>and</strong> one in thecentre of the head.• MouthpartsThe locust has biting mouthparts <strong>and</strong> uses them to eat leaves <strong>and</strong> partsof plants.Version: 01 Version Date: July 2006