Study Specimens Y, amd Q and answer questions 4(a) to 4(e).
(a)(i) State the sex of specimen P.
(ii) Give one reason tor the answer in 4(a).
(b)(i) Name the habitats of each of specimens P and Q (ii) State three adaptations each of specimens P and Q to their habitats. (c)(i) State one observable structural differences between specimens (ii) State three observable structural similarities between P and Q. (d)(i) Observe the mouthpart of specimen Q and state its feeding mechanism.
(ii) List one food which specimen Q feeds on.
(e) Remove carefully one of the legs on the right side of the metathorax of specimen P. Make a drawing, 6 cm to 8 cm long of the removed leg and label fully.
Explanation
SECTION C
(a(i) Sex of specimen P (cockroach): Male. (ii) Reason: Presence of anal style
(b)(i) Habitat of Specimen P (Cockroach) and Specimen Q (Grasshopper):
Specimen P (Cockroach): Pit toilet/dark boxes/soak away/wardrobe/kitchen/dark cupboard/book shelves/crevices cracks.
Specimen Q (Grasshopper): Garden/farmland/vegetation/grassland.
(b(i) Adaptations of Specimens P and Q to their Habitats:,
Specimen P (Cockroach): - flat/dorsoventral flattened body; to move between small cracks/spaces/crevices.
Jointed legs; for fast movement (to escape from predators); -tiny legs to crawl
(membraneous) wings for flight, dark brown colour of body; serves as camouflage (from predators);
;- well developed mandibles/mouth parts; - for feeding; - compound eyes; for vision/sight/wide view
hardened forewings/chitinous exoskeleton; for protection; spiracles for gaseous exchange; -antenna for detection
Specimen Q (Grasshopper):-(Green) colour of body/for camouflage (from predators),
(A pair of) antenna to detect vibrations and smell/sensitivity;-(numerous abdominal) spiracles; for gaseous exchange/breathing
;- well developed mandibles/mouth parts; - for chewing / feeding / tearing
Jointed legs for fast movement (to escape from predators); -(membraneous) wings; for flight (from predators); eyes; for vision/sight.
ci) Differences between specimens P and Q:
|
Specimen P (Cockroach) |
Specimen Q (Grasshopper) y |
|
-It has brown coloured body |
Green coloured bod |
|
Dorsoventral flattened body |
Cylindrical body |
|
- Short hind leg/limb |
-Elongated hind leg/limb |
|
-Has two pairs of wings |
One pair of wings |
|
- Slender hind leg (s) |
Large/muscular/stout hind legs |
|
- Long antennae |
Short antennae |
|
Spines on every side of hind leg |
Row of spines on the inner Side of the hind leg |
(ii) Similarities between Specimens P and Q both have: - membraneous Wings; segmented body; - three body division/head, thorax and abdomen
- three pairs of walking legs: have jointed appendages;
presence of antennae: -biting chewing mouthparts/mandible;- exoskeleton of chitin: -compound eyes..
(d) (i) Feeding mechanism of Specimen Q (Grasshopper): Biting and chewing (mouthparts).
(ii) Food items Specimen Q (Grasshopper):, Feeds on foliage leaves, young/tender stem/green stem/ grass.
