Topics : (1.1) , (1.2)
(1.3)
/ 9 / 2025
Grade (8)
Name:………………………
A,B,C,D,E
Scientific Concepts :
Photosynthesis : plants make glucose and produce oxygen using carbon
dioxide , water and light energy .
-To do photosynthesis , leaves need :
1)water
2)carbon dioxide
3)light energy
-Leaves capture light energy from the sun through a green pigment called
chlorophyll .
-Chlorophyll : is a green pigment in the chloroplast , used to capture light
energy from the sun during the photosynthesis process .
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-Why is photosynthesis important ?
1)provides energy [ chemical energy] stored in nutrients .
The chemical energy passes from plants (producers) to the other animals
through a food chain .
2)provides oxygen to the atmosphere .
-Minerals and plant growth :
Fertiliser :is a substance that contains minerals added to the soil to help plants
growth .
Examples of minerals :
1) Magnesium : needed to make chlorophyll
2)Nitrate : contains nitrogen atoms . It is needed for making protein , and
making chlorophyll .
Carbon cycle :
-All organisms release carbon dioxide during respiration to the air .
Glucose + oxygen
carbon dioxide + water
-Plants take carbon dioxide from air during photosynthesis process .
-When organisms die , their bodies get buried under high pressure and
temperature , and then they have changed into fossil fuel .
-Types of fossil fuel :
1) coal
2) oil
3) natural gas
-Fossil fuels contain carbon , when we burn fossil fuel , carbon combines with
oxygen to produce carbon dioxide .This is called combustion .
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