2019/2020 WAEC GCE BIOLOGY PRACTICAL Obj & Essay Answer (Nov/Dec) Expo

WAEC GCE Nov/Dec 2019 BIOLOGY PRACTICAL Expo Answer
 The 2019 WAEC GCE Aug/Sept BIOLOGY PRACTICAL (Obj & Essay) Solution Expo Questions and Answer=====================================

(1ai)
X – Eating
Y – Blowing
Z – Drinking
(1aii)
X
Biological System: Digestive system
Organs: Mouth, Tongue, Oesophagus
Y
Biological system: Expiratory system
Organs: Lungs, Nostrils, Mouth
(1aiii)
(i) Digestive system
(ii) Transport system
(iii) Excretory system
(iv) Muscular system
(1b) 
(i) It helps in excretion of unwanted materials
(ii) It forms saliva and mucus which helps to digest our food and keeps the mouth, nose, and eyes moist.
(iii) It delivers oxygen throughout the body
(iv) It boosts skin health and beauty by preventing it from with dehydration. 
(1c)
Bread – increased weight
Beans – intestinal discomfort
Vegetable – indigestion
Orange- Diarrhea
Water – hyponatremia 
Butter – obesity
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(2a)
I – Queen 
II -Soldier 
III – Male (king) 
IV – Worker 
V – Nasute 
(2aii) 
I – Lay eggs and produce the young 
II – Defend the territory 
III – Mate with the queen 
IV – Search for foods and feed the colony 
V – Clean the territory or the colony 
(2aiii) 
I – Queen : possession of eggs
II – Possession of power mandible 
V – Possession of strongly built walking legs
(2bi)
Social behavior adaptation 
(2bii)
Works or duties are shared among the castes 
(2biii)
Bees 
(2c)
– Cause decomposition of materials eg wood 
– Serves as food 
– Promotes nutrients availability in the soil
(2d)
Tabular Form;
Under I
(i)it has small head
(ii) the abdomen is large and 
(iii)it has no walking legs 
Under II
(i)it has big head
(ii)the abdomen is small
(iii)it has walking legs
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(4ai)
Pollination 
(4aii)
I. Self pollination 
II. Self pollination
III. cross pollination 
(4aiii)
I. Transfer of pollen grain from the anther of one flower for the stigma of the same flower 
II. Transfer of pollen grains from the anther of one flower to the stigma of another flower on the same plant 
III. Transfer of pollen grains from the anther of a flower to the stigma of another flower on a different plant of the species
(4bi)
(i) Sexual reproduction
(4bii)
(i) Flowers have reproductive organs
(ii) It involves the production of gametes 
(4c)
(i) Produces healthier seeds
(ii) Plants produced from III are more likely to survive changes in environmental conditions
(iii) It leads to greater variations among species and a faster rate of evolution
(4d)
(i)butterfly (insect)
(ii)birds (aves)
(iii)man (mammals) 
(iv)bat
(4e)
It will lead the formation of a new hybrid 
(4f)
(i)the pollens are rough and sticky 
(ii)the stigma is flat with sticky surface to recures the pollens 
(iii)the way the petals are arranged 
(iv)maturation of stamens and stigmas 
(4g)
(i)the plants have large conscious petals and sepal 
(ii)the flower are brightly colored 
(iii)the flower possess scent 
(iv)the flower have nectar.
(4gii)
(i)bees
(ii)butterflies 
(4h)
(i)androecium
(ii)gynoecium
(iii)stigma
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Completed
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