2018/2019 Waec Gce Agricultural Science 3 (Alternative to Practical Work) Questions And Answers Now Available Here

Use this for Nigerians

(NUMBER 1)

(1a)
To determine the moisture content in the soil

(1b)
I=Evaporating dish
II=Garden soil
III=Tripod stand
IV=Bunsen burner

(1ci)

Weight of the water lost =original weight of sand and container – weight of container

80 – 35=45g

(1cii)
Weight of water lost=original weight of sand and container – Final weight

60 – 45 =15g

(1ciii)percentage of water lost from the soil=
Mass of water / mass of fresh soil × 100 / 1

=15/80 × 100/1
=18.75%

(1d)
(i)Rainfall
(ii)Condensation
(iii)percipitation

(NUMBER 2)

(2a)
Area of farmland = 1/2(70+90)40
=1/2(160)×40
80×40=3200m²

(2b)
The spacing will take an area of 4×4 = 16cm²
The number of banana plants in the farmland =
Total area of farmland/Area taken by each banana
=3200m²/16m²
=200

(2ci)
I – Raging pole
II – Survey Pin

(2cii)
Uses of I:
(i) For mark out area to be measured
(ii) It guides the surveyor

Uses of II:
(i) For marking out chain length as measured
(ii) For making out areas that are not straight

(2ciii)
(i) Rub oil on the metal surface before storage
(ii) Store in a dry place

(3a)
I – Grasshopper
II – Weevil
III – Cotton stainer

(3b)
I – Grasshopper exhibits incomplete metamorphosis that is Egg-nymph-adult

(3c)
(i) Transmission of diseases which are harmful to crops.
(ii) It means to stunted growth of plants.
(iii) It leads to yellowing of leaves due to the absence of micro nutrients like phosphorous
(iv) It leads to death of plants

(3d)
(i) Setting traps like funnel entrance traps with trigger mechanism
(ii) Use of avicides
(iii) Use of fenced traps
(iv) Use of poison baits

4a)
i Duct
ii. Tectis
iii. Penis
iv. Seminal viscule
v. Penis Coat
vi Epidemis

4b)

Duct – it move the sperm cell from testis to penis

Tectis – it helps in store the sperm cells or spermatozoa

Penis – it’s used to introduce the sperm cell into the female

Seminal viscoule – it helps to form a fluid in which the sperm cell can move

Peniscoat – it’s protect the penis

Epidemis – it produces the sperm cells

4ci)
Castration

4cii)
– Duct will be cut
– The epidermis will be removed

Completed