Study specimens L and M and answer questions 4(a) to 4(e). (a) Classify each of specimens L and M into its: (i) Phylum L: ________ M: _______(ii) Class L:_______ M:_______ (b)(i) State three observable features of members of the class of specimen L. (ii) Name three other classes of the phylum to which specimen L belongs. (c)(i) State two ways each by which specimens L and M are of economic importance. L: _______ M: ________ (ii) State five ways by which specimen L can be controlled. (d)(i) State five observable differences between specimens L and M.
(ii) State four observable similarities between specimens L and M. (e) Name one habitat each of specimens L and M. L:_______ M:_______
Explanation
(a) Classification: (i) Phylum L: Arthropoda M: Arthropoda (ii) Class: L:insecta: M: insecta, (b)i) Observable Features of Members of the Class of Specimen L:-Three body divisions: head, thorax, abdomen;-Three pairs of jointed walking legs;-Presence of wings;-A pair of jointed antennae -Spiracles present;- A pair of compound eyes; -Exoskeleton of chitin/chitinous exoskeleton. (ii) Other classes of phylum of specimen L:-Crustacea-Chilopoda-Diplopoda-Arachnida. (c) Economic Importance of Specimen: (i) L: -Vector/transmits diseases; -Buzzing noise disturbs(sleep)-Causes discomfort through its bites. M: -Has aesthetic value/used as ornament, Pollinates flowers: -Destroys(citrus) fruits by feeding on them; (ii) Ways by which Specimen L/Mosquito can be Controlled -Sleeping under nets ( to prevent adult mosquito bites); Clearing the bushes around the house ( to eliminate places where mosquitoes hide and breed); -Removing all stagnant water bodies around the house ( to prevent mosquitoes from breeding); -Using/spraying insecticides in the rooms/around the house (to kill adult mosquitos) -Pouring oil on stagnant water bodies (to suffocate the larvae),-Introducing fish/bacteria, e.g. Bacillus species into water bodies (to eat up mosquito larvae and pupae); -Using mosquito repellents(to prevent adult mosquitos from biting); -Using light to attract and kill adult mosquitoes/use of mosquito trap: -Using genetically modified mosquitoes to result in early death of larvae/eggs that do not hatch.
(d)(i) Observable differences between specimens L and M
(ii)Similarities between specimens L and M: Both have -three body divisions/head, thorax and abdomen-proboscis; -wings: Six legs/three pairs of legs:- one pair of compound eyes; - one pair of antennae - Exoskeleton of chitin chitinous exoskeleton; - Segmented abdomens - three thoracic segments.
(c) Habitat of specimens L and M: L: Houses/land/swamp/marshy areas/ dark places/tall grasses/ pond(s) M: Garden/on trees/leaves/flowers/rock surfaces/bare ground/grassland