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Chapter – 6
Life Processes
The main fundamental functions performed by living organisms to maintain their
life are called life processes
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Autotrophs
Heterotrophs
* Able to prepare their own food by
*They depend on autotrophs for food
Photosynthesis
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*Use in-organic simple materials like water,CO2
to prepare food
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Complex materials
broken
Simpler
ones by using enzymes
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*eg: animals, fungi
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*Carbohydrates are stored as starch
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* Internal energy reserve in our body – Glycogen
chlorophyll
6CO2 +12H2O
sunlight
C6H12O6 +6O2 + 6H2O
Events during photosynthesis:i)Absorption of light energy by chlorophyll
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iii)Reduction of CO2 into carbohydrate
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Design an experiment to demonstrate that chlorophyll is essential for
photosynthesis
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Design an experiment to demonstrate that CO2 is essential for photosynthesis
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Design an experiment to demonstrate that sunlight is essential for
photosynthesis
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^ Functions:- *gaseous exchange
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^ Opening and closing of stomata is controlled by guard cells
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Guard cells shrink - stomata closed
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Eg: yeast, mushroom,
Bread moulds etc:
Parasites :- Derive nutrition from plants / animals
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)
* Which fuse over food and forms food vacuole
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*Undigested materials are thrown out
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Has definite shape
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simpler ones
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What are the differences between autotrophic nutrition and heterotrophic
nutrition?
2
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a)Draw the diagram to show open stomatal pore and label the parts
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c)How do guard cells regulate the opening and closing of stomatal pore?
4
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5
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6
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Will this plant remain healthy for long
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7
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What is this green
colour due to?
8
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How the organisms like bread moulds and mushrooms obtain their food?
10
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b)Design an
experiment to show that “cholorophyll is essential for photosynthesis