(a) Study specimens E and F carefully and use them to answer questions 2(a)(i) to 2(a)(ii).
(i) State the Class to which each of specimens E and F belong.
(ii) List four observable features each of specimens E and F.
(iii) State how each of the observed features in 2(a)(i) adapt each of specimens E and F to their habitats.
(b) Study specimen G and use it to answer questions 2(b)(i) to 2(b)(ii).
(i) Classify specimen G into its phylum and class.
(ii) State four observable features of specimen C.
(iii) Name one habitat of specimen C.
Explanation
(a)(i) Class: Specimen E-Mammalia. Specimen F-Aves.
(ii) Observable features of Specimen E and F: Specimen E - Pinna/External ear.
Body covered with fur/hair,
mammary gland.
Heterodont dentition.
Whiskers; (five) clawed digits/pentadactyl limbs.
Specimen F- Body covered with feathers;
mouth modified into beak;
legs have (horny) Scale.
Fore-limb modified into wings/presence of wings; stream-lined body.
(iii) Features which adapt Specimen E and F to their habitats:
Specimen E- enlarged external ear/Pinna for trapping sound waves.
whiskers for detection of vibration of vibration/feeling its way througn burrows.
- Pear shape head/narrow body with folded legs for easy movement in burrows.
Position of eyes on either side of the head allows wide range of view.
- Long (muscular) hind limbs for hopping/ jumping.
Sharp incisors/heterodont dentition for nibbing vegetation/ mxed diet.
-Limbs end in claws used for scratching/digging.
-Body covered with fur/hair for temperature regulation.
Specimen F- Forelimbs modified to wings for flying.
Streamined body for easy movement through the air during flight.
- Possession of feathers on the body for temperature regulation.
-Tail feathers used for steering/balancing/brake/courtship display.
- Beak adapted for feeding.
-Clawed digits for scratching for food.
- Position of eyes/laterally placed eyes for wide vision.
(b)(i) Classification: Phylum of G- Arthropoda. Class of G Insecta.
(ii) Observable features of Specimen B: (Upper part of) abdomen constricted into a waist/has a narrow waist.
- Two pairs of (membraneous) wings.
- Fore wings wings larger than hind wings.
-Wings are linked together by hooklets.
-Has piercing and biting mouthparts.
- Metameric segmentation.
- Bilaterally symmetrical.
- Three pairs of (thoracic) legs.
- Three body divisions head, thorax and. abdomen.
- Presence of exoskeleton (of chitin)
.- one pair of antennae.
- One pair of compound eyes.
- Presence of jointed appendages.
(iii) Habitat of Specimen G: Mud nest on ceiling of buildings/wall/furniture.