Observe Specimen Q, under a microscope and... | WAEC SSCE - Biology - 2015 (Practical)

Question 1 Report

Observe Specimen Q, under a microscope and specimen R, carefully. Use them to answer questions 3(a) to 3(e).

(a)(i) State the phylum to which each of specimen Q and R belong. (ii) State one reason each for the answers stated in 3(a)(i).

(iii) What is the symmetry of specimen Q and R?

(b)(i) State two observable features each of specimen Q and R. (ii) State one function each of the features mentioned in 3(b)(i).

(c)(i) Name the sex of specimen R. (ii) Give one reason for the answer given in 3(c)(i).

(d) In tabular form, state four observable differences between specimen Q and R.

(e) Make a drawing 10 cm-12 cm long of the lateral view of specimen R and label fully.

Answer

Model Answer

(a)(i) Specimens Q and R belong to Phylum Arthropoda.

(a)(ii) Each specimen has a hard chitinous exoskeleton and jointed appendages.

(a)(iii) Both specimens possess bilateral symmetry.

(b)(i) Observable features and their functions

Specimen	Observable feature	Function
Q, cockroach	Long, segmented antennae	They detect touch, odours and vibrations in the surroundings.
Q, cockroach	Flattened body with a hard exoskeleton	The exoskeleton protects the body and reduces water loss.
R, grasshopper	Large, muscular hind legs	They are used for jumping and escape from danger.
R, grasshopper	Two pairs of wings	They aid movement by flight.

(c)(i) Specimen R is female.

(c)(ii) It has a distinct ovipositor at the posterior end of the abdomen for laying eggs.

(d) Observable differences between specimens Q and R

Feature	Specimen Q, cockroach	Specimen R, grasshopper
Body shape	Body is dorsoventrally flattened.	Body is elongated and laterally compressed.
Hind legs	Hind legs are not greatly enlarged.	Hind legs are long, enlarged and adapted for jumping.
Wings	Forewings are leathery and lie flat over the abdomen.	Forewings are narrow tegmina; the broad hind wings are folded fanwise.
Antennae	Antennae are very long and thread-like.	Antennae are relatively short and stout.

(e) Lateral view of specimen R

Title: Lateral view of a female grasshopper, specimen R.

Drawn to a length of 10–12 cm and fully labelled:

Lateral view of a female grasshopper, with major external features labelled.

Read lesson note on Tissues And Supporting Systems: (WAEC)

Answer Details

Model Answer

(a)(i) Specimens Q and R belong to Phylum Arthropoda.

(a)(ii) Each specimen has a hard chitinous exoskeleton and jointed appendages.

(a)(iii) Both specimens possess bilateral symmetry.

(b)(i) Observable features and their functions

Specimen	Observable feature	Function
Q, cockroach	Long, segmented antennae	They detect touch, odours and vibrations in the surroundings.
Q, cockroach	Flattened body with a hard exoskeleton	The exoskeleton protects the body and reduces water loss.
R, grasshopper	Large, muscular hind legs	They are used for jumping and escape from danger.
R, grasshopper	Two pairs of wings	They aid movement by flight.

(c)(i) Specimen R is female.

(c)(ii) It has a distinct ovipositor at the posterior end of the abdomen for laying eggs.

(d) Observable differences between specimens Q and R

Feature	Specimen Q, cockroach	Specimen R, grasshopper
Body shape	Body is dorsoventrally flattened.	Body is elongated and laterally compressed.
Hind legs	Hind legs are not greatly enlarged.	Hind legs are long, enlarged and adapted for jumping.
Wings	Forewings are leathery and lie flat over the abdomen.	Forewings are narrow tegmina; the broad hind wings are folded fanwise.
Antennae	Antennae are very long and thread-like.	Antennae are relatively short and stout.

(e) Lateral view of specimen R

Title: Lateral view of a female grasshopper, specimen R.

Drawn to a length of 10–12 cm and fully labelled:

Read lesson note on Tissues And Supporting Systems: (WAEC)

Tissues And Supporting Systems:

View Answer

Observe Specimen Q, under a microscope and specimen R, carefully. Use them to answer questions 3(a) to 3(e). Specimens Q and R (a)(i) State the phylum to wh...

Model Answer

(b)(i) Observable features and their functions

(d) Observable differences between specimens Q and R

(e) Lateral view of specimen R

Model Answer

(b)(i) Observable features and their functions

(d) Observable differences between specimens Q and R

(e) Lateral view of specimen R

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Observe Specimen Q, under a microscope and specimen R, carefully. Use them to answer questions 3(a) to 3(e). Specimens Q and R (a)(i) State the phylum to wh...

Model Answer

(b)(i) Observable features and their functions

(d) Observable differences between specimens Q and R

(e) Lateral view of specimen R

Model Answer

(b)(i) Observable features and their functions

(d) Observable differences between specimens Q and R

(e) Lateral view of specimen R

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