WAEC GCE 2019 - BIOLOGY ANSWER

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ANSWERS:

(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 - Pollen grain is transferred from anther to stigma of the same flower
II - Pollen grain is transferred from anther of one flower to stigma on another flower in the same plant
III - Pollen grain from the anther of one plant is transferred to the stigma of a different plant

(4b)
(i) Sexual reproduction
(ii) Flowers have reproductive organs

(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)

(4e)
It will lead to formation of new hybrid

(4f)
(i) Maturation of stamens and stigmas
(ii) Self-sterility and incompatibility
(iii) Positions of stigma and anthers

(4gi)
(i) Flowers are often scented
(ii) Flowers have nectaries t the base which secretes nectar or flower juice
(iii) Pollen grains are rough, spiny or sticky
(iv) Broad stigmas for effective retension of pollen grains after pollination

(4gii)
(i) Bees
(ii) Butterflies

(4h)
(i) Androecium
(ii) Gynoecium







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