hi
Today is turn of class 7. So here is continuation of notes :-
Organ level of organisation :- Tissue of body combine to form well coordinated organ. Each organ of plant body or animal body is the combination of tissue. For example -
1.  Leaf is the organ of plant body. It is made up of xylem tissue (carry water), phloem tissue (carry food) , Stomata etc.
2.  Heart is the organ which has cardiac muscle tissue, blood vessels, blood etc.

Organ system level of organisation :- Organ system is the combination of many organs which perform a specific function. For example :-
1.  Shoot system of plant includes organs like - stem, leaf, flower etc.
2.  Digestive system of human includes organs like - stomach, liver, intestine etc. In digestive system the organs perform process called nutrition.
Organ system represents the organ system level of organisation.

Organism :- Every organism is the combined package of many organ systems which work together in well coordinated manner. Very interesting example is your body in which digestive system, respiratory system, circulatory system, skeletal system etc. work together and controlled by nervous system.
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Notes of this week is over for class 7. Now my dear students it's time for some assignment .
On page no. 10 of your book there are three activities read it and prepare it as project in the file.