(a) Identify specimens A, B and C Specimen A; Specimen B; Specimen C; %% (b) Give one function of each of Specimen A, B and C (c) State two ways of maintain...

(a) Identification of specimens

• Specimen A: Nut and bolt.
• Specimen B: Knapsack sprayer.
• Specimen C: Identification tag.

(b) One function of each specimen

• A (nut and bolt): Used for tightening, fastening, fixing or holding joints of implements and machines together.
• B (knapsack sprayer): Used for spraying and applying agrochemicals such as fungicides, insecticides, herbicides and liquid fertilizers on crops.
• C (identification tag): Used for the identification of animals.

(c) Two ways of maintaining each of specimens A and B

Specimen A (nut and bolt):

1. Grease or oil it to prevent rusting.
2. Re-thread worn-out threads and store in a cool, dry place. (Straightening a bent bolt or nut is also acceptable.)

Specimen B (knapsack sprayer):

1. Wash and clean the tank, filters and nozzles with water after every use, and drain the tank by turning it upside down.
2. Check for leakages and block them, replace damaged or worn parts such as filters and nozzles, and store the sprayer under cover.

(d) Three other farm implements that perform the same function as specimen B

1. Motorized sprayer
2. Boom sprayer
3. Hand sprayer (electrodyne/knapsack-type sprayers are also acceptable)

(e) Two precautions to be observed when using specimen B

1. Wear protective clothing and a nose mask, and do not eat, drink or smoke while spraying.
2. Ensure that spraying is done along the direction of the wind, not against it, and never blow a blocked nozzle with the mouth.