Study carefully specimen E and F and use them to answer questions 2(a) to 2(d).
(a) (i) What class of organism do specimen E and F belong to?
(ii) State three similarities between specimen E and F.
(iii) In a tabular form, state three differences between specimens E and F;
(b) State two ways each in which: (i) Specimen E (ii) Specimen F are of economic importance.
(C)(i) State one observable feature each of specimens E and F and how these features adapt the specimens against predation.
(ii) Name the habitats of specimens E and F.
(d) Remove all the wings of specimen E. Make a drawing 8-10 cm long of the dorsal view of specimen E and label fully.
Explanation
(a)(i) Specimens E and F belong to Class insecta.
(ii) Similarities: Both specimens A and B Possess 6 legs/3 pair of legs; Both specimens A and B have 3 body d thorax and abdomen/segmented body.
Both specimens A and B are bilaterally symmetrical; Both specimens A and B possess mandibles/mandibulate mouth parts;
Both specimens A and B have jointed appendages/ Jointed legs; Both specimens A and B have a pair of antennae.
(iii) Differences:
|
Specimen E/ Cockroach |
Specimen F/Soldier Termite |
|
Small head relative to the body, |
Large head related to the body; |
|
Wings present |
Wings absent; |
|
Has compound eyes/has sight; |
No eyes /blind/has no sight; |
|
Dark brown colour, |
light brown colour; |
|
Small mandibles present |
Large mandibles present; |
(b) Economic Importance:
(i) Specimen E/Cockroach Destroys clothes/ books/ boxes; - contaminates food/ reduces the quality of food; - gives foul odour, serves as a vector of diseases;
(ii) Specimen F/Soldier Termite: Speeds up decaying process/by breaking down of dead trees to form humus which increases soil fertility;
-They destroy wood in roofs/houses /furniture;
-The mud from the termitarium is used in constructing lawn tennis courts/construction of houses;
-For poultry feed/source of protein; Improves soil drainage/aeration through their channels;
- Destroy crops/ timber.
(c)(i) Adaptation of Specimen E/Cockroach Against Predation:- Specimen E has wings to fly away from predators;
-Its brown colour matches with the environment as camouflage against predators; -the flattened shape make it easy to hide in crevices to escape.
Adaptation of Specimen F Against Predation: Presence of mandibles for defense/protection.
-Possesses snout-like projection that produces a poisonous substance for protection.
(ii) Habitat: Specimen E/Cockroach- dark boxes/cupboards, cesspits/any other correct habitat.
(ii) Specimen F/Soldier Termite-Termitarium/termite mold/hill
