TEST OF PRACTICAL KNOWLEDGE QUESTION Study Specimens P(Cockroach), and Q(Grasshopper) and answer questions 4(a) to 4(e). (a)(i) State the sex of specimen P....

TEST OF PRACTICAL KNOWLEDGE QUESTION

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).

(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.

Answer Details

(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:

(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.