2017 WAEC Biology Practical Study specimens F and G carefully and answer questions 2(a) and 2(b). (a) State three...

Study specimens F and G carefully and answer questions 2(a) and 2(b).

(a) State three observable features of biological importance in: (i) specimen F; (ii) Specimen G.

(b) (i) Classify specimens F and G as either stem tuber or root tuber. (ii) Give two reasons each for the answer in 2(b)(i).

Study specimens H and J and answer questions 2(c) to 2(e).

(d) (i) state four observable differences between specimens H and J. (ii) State four observable similarities between specimens H and J.

(e) (i) State the feeding habits of each of specimens H and J. (ii) Name two observable features used for feeding in specimen J.

(bi. Classification of Specimen F/Carrot Root tuber

Specimen G / lrish potato Stem tuber

ii. Reasons for classification Specimen F/Carrot -Swollen tap root - lateral roots present has a reduced stem (above the swollen tap root).

Specimen G / irish potato swollen stem/ tuber -presence of bud(s)/eye -presence of scale leaves/leaf -presence of lenticel(s).

(d(i). Observable differences between specimens Hand J

H/adult mosquito	J/adult cockroach
- smaller in size	big/large in size
-a pair of wings	two pairs of wings
-absence of hard hind wing	presence of hard hind wing/elytra
-shorter antennae	longer antennae
-proboscis	mandible
absence of maxillary palp/maxilla	presence of maxillary palp/maxilla
- body is cylindrical	body is dorso-ventraly flattened
-thin legs	thick large legs
-absence of spines on legs	presence of spines on legs

ii. Similarities between specimens H adult mosquito and J/ adult cockroach:

-presence of a pair of compound eyes -body is divided into three divisions/head, thorax and abdomen - three pairs of /six (walking) legs

- presence of jointed appendages -presence of a pair of membraneous wings -presence of a pair of antennae

-both have exoskeleton made of chitin -segmented body

(e) Feeding habit of Specimen H / adult mosquito -piercing and sucking Specimen J / adult cockroach Biting and chewing.

(ii) Observable features used for feeding in specimen J adult /cockroach Mandible; maxillae; labium; labrum

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