2018/19 WASSCE MAY/JUNE BIOLOGY PRACTICAL QUESTIONS AND ANSWERS

*BIOLOGY PRACTICAL ANSWERS

1ai) 

A- water 

B- decaying plant and animal matter 

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1aiii) 

A) A phylum is Artropoda, class is insecta 

B- phylum is Artropoda,  class is insecta 

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1b) 

A)

i) well developed head with mouth brushes 

ii) on large thorax with no legs 

iii) segmented abdomen 

B) 

i) reduced head 

ii) legless

iii) mouth parts at the pointed end

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1c)  in tabular form 

A-

I) mosquito larvae can only survive in water 

ii) well developed head 

iii) mouth part in sucking 

B

i) maggots do not need a water habitat to survive 

ii) reduced head 

iii)  mouth parts for biting and chewing 

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1cii) 

i) both are legless 

ii)  both have thorax 

iii)  both have mouth parts 

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(2ai)

C - Fish 

D - Mammal

E - Flowering plant 

(2aii) 

They are used for respiration. 

(2aiii) 

(i) Possession of two rows of fine finger like Gill filament. 

(ii) Possession of gill rakers. 

(iii) Possession of richly supplied blood capillaries. 

(2bi)

(i) Both are supplied with blood capillaries. 

(ii) Both of them are used for respiration. 

(2bii)

In a tabular form; Specimen C and specimen D

Under specimen C

(i) Possession of gill rakers. 

(ii) Possession of gill filament.

(iii) Possession of gill arch.

Under specimen D

(i) Possession of bronchus.

(ii) Possession of alveoli. 

(iii) Possession of alveolar cavity.

(2c)

Draw the 6cm-8cm long of specimen C ie Gill of fish

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(4)

(ai) Sepals, Petals, Carpels and Stamens

(ii) Sepals - 5

(iii) Petals - 5

(iv) Carpels - 1

(v) Stamen - 10

(4bi) Sex - monoecious 

(ii) presence of both Carpels and Stamens

(4c)

i - Bilateral

ii - it can be cut vertically into two similar halves through one plane

(4d)

K - insect

L - wind

(4e)

In a tabular form; K and L

Under K

(i) Has very bright colours.

(ii) Single flower per stalk.

(iii) Has petals.

(iv) Lacks bracts.

Under L

(i) Lacks bright colours.

(ii) Bears many flowers per stalk(influorescence).

(iii) Lacks petals.

(iv) Has bracts.