IGCSE Biology - Photosynthesis (6.1)

Cambridge IGCSE Biology (0610/0970)
Chapter 6 - Plant nutrition
Topic 6.1 - Photosynthesis
For exams in 2023, 2024 & 2025 (core and extended)

As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam!

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@igpecomplete - Cambridge IGCSE PE
@ocrpecomplete - OCR GCSE PE

Timestamps:
0:00 Contents
0:53 Photosynthesis
1:46 Use and storage of carbohydrates
2:55 Mineral requirements
3:13 Experiments
9:02 Photosynthesis (extended)
9:23 Limiting factors (extended)

Core content:
- Describe photosynthesis as the process by which plants synthesise carbohydrates from raw materials using energy from light.
- State the word equation for photosynthesis as: carbon dioxide + water → glucose + oxygen, in the presence of light and chlorophyll.
- State that chlorophyll is a green pigment that is found in chloroplasts.
- State that chlorophyll transfers energy from light into energy in chemicals, for the synthesis of carbohydrates.
- Outline the subsequent use and storage of the carbohydrates made in photosynthesis, limited to:
(a) starch as an energy store
(b) cellulose to build cell walls
(c) glucose used in respiration to provide energy
(d) sucrose for transport in the phloem
(e) nectar to attract insects for pollination
- Explain the importance of:
(a) nitrate ions for making amino acids
(b) magnesium ions for making chlorophyll
- Investigate the need for chlorophyll, light and carbon dioxide for photosynthesis, using appropriate controls.
- Investigate and describe the effects of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis.
- Investigate and describe the effect of light and dark conditions on gas exchange in an aquatic plant using hydrogencarbonate indicator solution.

Extended content:
- State the balanced chemical equation for photosynthesis as:
6CO2 + 6H2O → C6H12O6 + 6O2
- Identify and explain the limiting factors of photosynthesis in different environmental conditions.

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[karunyap]

love your work can you please try to add a Cambridge question about the topic to practice because I find really hard to get the exact term, they want me to write.

[ksumar]

Good summary. You covered a Ton of stuff in 10 minutes. Nice work!
Just curious at 7:00 you say :
Decrease in CO2 agreed as Photosynthesis takes place, then you say
Decrease in CO2 again? Should that say increase in O2 (oxygen), as O2 is released as by product?

Also, when adding a leaf to the test tube in boiling hot water, NO BUNSEN Burner is required as Ethanol boils at 78C. The water beaker generates enough heat at 100C at 4:04

[AHidris..]

Are we supposed to revise these experiments again for paper 2??

[sarangadbb]

sir if it is possible for you. can you do paer4 and paper6. because I am doing Cambridge igcse biology in 2024. and I need help with those.

[AHidris..]

Am I supposed to memorize all these experiments for paper 6?