January 2023

Plant pests and diseases

By |2022-09-15T12:41:52+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

A grasshopper. Image credit nutrainigridients.com

A grasshopper. Image credit nutrainigridients.com ZIMSEC O Level Combined Science Notes: Plant pests and diseases
  • In the wild there is a balance in nature.
  • The are few pests and diseases that destroy plants.
  • In crop plants there are more pests that cause and spread disease.
  • This is because there […]

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Pest control

By |2022-09-15T12:41:52+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Tomato plant with red mite. Image credit thedemogadern.org

Tomato plant with red mite. Image credit thedemogadern.org ZIMSEC O Level Combined Notes: Pest Control
  • Pests cause damage to plants and spread diseases.
  • This results in a reduction in crop yields.
  • Control measures can be taken to minimise this damage.
  • The control measures can be either […]

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Safety when using chemicals

By |2022-09-15T12:41:51+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Safe use of chemicals. Image credit montana.edu

Safe use of chemicals. Image credit montana.edu ZIMSEC Combined Science Notes: Safety when using chemicals
  • Pesticides are almost always harmful to human beings.
  • They are graded according to their level of toxicity i.e. how dangerous they are to humans.
  • There are no safe pesticides all are […]

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Pesticide Warning Symbols

By |2022-09-15T12:41:51+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit incomdirect.com

Image credit incomdirect.com ZIMSEC O Level Combined Science Notes: Pesticide Warning Symbols
  • Pesticides are graded according to their toxicity i.e.
  • According to how harmful they are to humans.
  • Every pesticide must have a label that clearly shows its “danger” level show.
  • There are four common danger levels of chemicals.

Purple […]

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Safety wear

By |2022-09-15T12:41:51+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Safety Equipment Image credit nextmundo.com

Safety Equipment Image credit nexomundo.com ZIMSEC O Level Combined Science Notes: Safety wear
  • Pesticides are dangerous and need to be handled with care.
  • The following equipment ought to be used when handling chemicals depending on the instructions of each chemical’s label and its usage directions.

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