February 2025

The structure of the leaf and photosynthesis

By |2025-02-12T08:56:55+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The external structure of the leaf. Image credit passmyexams.co.uk The external structure of the leaf. Image credit passmyexams.co.uk ZIMSEC O Level Combined Science Notes: The structure of the leaf and photosynthesis

  • The leaves are the main organs of photosynthesis.
  • Their structure is adopted for the process of photosynthesis.
  • Veins-vein networks support the physical structure […]
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Photosynthesis

By |2025-02-12T09:33:37+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science: Photosynthesis

  • Green plants are the food and oxygen producers of the living world.
  • They manufacture organic molecules from inorganic raw materials.
  • Animals rely on green plants to make food that provides them with energy and oxygen.
  • Green plants are thus known as producers and animals are in turn known as consumers.
  • Only green plants […]
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The Test for starch

By |2025-02-12T09:35:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

  • During the process of photosynthesis, a plant absorbs, a process which is aided by the presence of chlorophyll in the leaf
  • This enables the plant to convert carbon dioxide and water into glucose
  • Some of this glucose is used up by the plant however
  • Any excess is turned into starch for storage
  • You can, therefore, test a plant’s leaf for starch in […]
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Factors,Inputs and outputs of photosynthesis

By |2025-02-12T09:36:23+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science: The test for starch

The requirements of photosynthesis

  • As already mentioned the food making process in plants is called photosynthesis.
  • In order for a plant to […]
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Carbon Dioxide and Photosynthesis

By |2025-02-12T09:37:48+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science: Carbon Dioxide and Photosynthesis

Aim: To test whether carbon dioxide is necessary for photosynthesis.

Materials: Potted green plants, potassium hydroxide solution (soda lime), two polythene bags/two bell jars, string, apparatus and reagents for the start test.

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Chlorophyll and Photosynthesis

By |2025-02-12T09:41:18+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A green leaf. Image credit wallconvert.com A green leaf. Image credit wallconvert.com ZIMSEC O Level Combined Science: Chlorophyll and Photosynthesis

Aim: To test whether chlorophyll is necessary for photosynthesis.

Materials

Two plants with variegated leaves i.e. leaves that are partly green, permanent marker  and equipment for the start test. A [...] </p srcset=

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End products of photosynthesis and their fate

By |2025-02-12T09:44:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit arboday.org Image credit arboday.org ZIMSEC O Level Combined Science Notes: End products of photosynthesis and their fate

  • Green leaves manufacture starch or sugar during the photosynthesis process
  • Oxygen is also given out.
  • The oxygen passes out of the leaves by the process of diffusion.
  • It diffuses into the surrounding air.
  • There are microscopic […]
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