Study Specimens P(Cockroach), and Q(Grasshopper) 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).
(ii) State three adaptations each of specimens P and Q to their habitats.
(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.
(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)
(ii) 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
- (membranous) 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)
-(Membranous) wings; for flight (from predators)
- Eyes; for vision/sight.
c)
i) Differences between specimens P and Q:
Specimen P (Cockroach) |
Specimen Q (Grasshopper) |
-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:
- Membranous 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.
