Spm Est Essay

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SAMPLE QUESTION

TASK
     Write a report Make a choice Compare the 2 methods Give reasons for choice of one over the other Add any relevant information

Methods Insecticides


Advantages Save great quantities of food from pests and diseases before harvest or during storage. Increase crop yield. • •

Disadvantages Kills useful insects. Adverse effects on wildlife for many years to come.



Biological control



Using natural predators to control pests. Host resistance is not a problem.



Expensive to find biological control agents. Can never eradicate a pest completely.







Advantage : Save great quantities of food from pests and diseases before harvest or during storage.

harvest and storage - the critical period that determines a farmer’s income reliability of insecticides ensures that the quantities of food that is harvested and stored is maintained at the most maximum.



Choice Made : INSECTICIDES

Advantage : Increase crop yield.



a variety of insecticides to choose from on the market, such as DDT, malation and furadan able to make a choice as to the most effective at the most affordable also increase their profit margin.





useful insects that help pollination and pest control, such as butterflies, bees and ladybugs. can be resolved by spraying the insecticides after pollination has occurred and when plants are in bud.



Disadvantage : Kills useful insects.

Choice Made : INSECTICIDES



can easily be reduced by using the insecticides which are lowest in the toxicity range

Disadvantage : Adverse effects on wildlife for many years to come.

Advantage : Save great quantities of food from pests and diseases before harvest or during storage. Choice Made : INSECTICIDES

Disadvantage : Kills useful insects.

Advantage : Increase crop yield.

Disadvantage : Adverse effects on wildlife for many years to come.

Methods Insecticides


Advantages Save great quantities of food from pests and diseases before harvest or during storage. Increase crop yield. • •

Disadvantages Kills useful insects. Adverse effects on wildlife for many years to come.



Biological control



Using natural predators to control pests. Host resistance is not a problem.



Expensive to find biological control agents. Can never eradicate a pest completely.







ladybugs will be used to control aphids short-term resolve to the problem because artificial introduction of natural predators to an area will cause an imbalance in the food chain in the end the predators themselves will end up being the pests, due to the lack of food.

Advantage : Using natural predators to control pests.





Compare & give reasons over other: Biological Control
• pests will never become resistant to their predator pests become resistant to insecticide after a period of time. easily resolved if the insecticides used are changed before pests become resistant to them.

Advantage : Host resistance is not a problem.

• •



Research needs to be done on whether the weather conditions and surrounding environment are suitable for the control agents to thrive Research costs money



Disadvantage : Expensive to find control agents

Compare & give reasons over other: Biological Control



in the long run, the pests and predators will achieve a balance in numbers the cycle of destruction begins



Disadvantage : Can never eradicate a pest completely

A

SAM PLE
of an excellent answer

A

SAM PLE
of an almost excellent answer

A

SAM PLE
of a poor answer

Another

SAM PLE
of a poor answer

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