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.

hi my dear students satish sir is back again with the blog. Today I am going to give you the weekly schedule of my subject contents class wise.
Monday and Tuesday                    Class 7
Wednesday and Thursday            Class 8
Friday and Saturday                     Class 9
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Now its time for questions for class 7 based on previous discussion. Copy these questions and solve as assignment.

Q.1   Which is lowest living level of organisation ?
Q.2   In which category would you like to keep following -
          (a) Protein   (b) Human   (c) Glucose
Q.3   How can you explain cellular level of organisation in sponge?
Q.4   Arrange following in the increasing order of complexity :-
          Organ system, cell, Organ, Organism, Tissue.
Q.5   How will you justify that we are made up of atoms?

Dear students I hope you have studied the notes on chapter Tissue where we have discussed about level of organisation starting from non-living atom to living cell.
In following post i am giving you some flow charts and easy to solve exercise questions. Have a good practice and happy learning.
Stay safe , Get connected # Stay at home.

Questions on above discussion will appear tomorrow.

Bye Bye

Notes of class 7

Chapter- Tissues

Tissue :-  Tissue is the group of structurally similar cells that perform similar function.

 In multicellular organisms the tissue group together to form different levels of organizations.

 Organization :- Organization is the manner in which smaller units of any structure or system are arranged into larger units in an hierarchical fashion.

In multicellular organism the level of organisation is important because of division of labour i.e. an organ system perform a specific function ( e.g. digestive system is for nutrition , Respiratory system is for breathing and respiration etc. ). There is a unique coordination among all organ system of an organism.

Atom, Molecule and macromolecule in level of organisation :-
The cell is starting of life. The cells are made up of many macromolecules like carbohydrate, Protein, fat, Nucleic acid etc. These macromolecules are combination of molecules, like :-
                 MACROMOLECULE                 MOLECULE
                 Carbohydrate                                   Glucose
                 Protein                                            Amino acid
                 Fat                                                   Fatty acid
                 Nucleic acid                                    Nucleotide

Now, molecules are made up of atoms like C, H, O, N, P, S, Na, Cl etc.
so, atom is starting point of level of organisation.

Cellular level of organisation :-
Macromolecules club together to form first signal of life called cell. In unicellular organisms like amoeba, bacteria etc. all life activities take place within single cell. 
In multicellular organisms like sponges, Algae cells group together but they do not form tissue. There is no division of labour.
So, these are representing cellular level of organisation.

Tissue level of organisation :-
In complex multicelllar organisms there is beginning of division of labour. The cells group together and perform specific functions. e.g.-

       CELL                               FUNCTION               TISSUE
        Nerve cells                                Conduct message          Nervous tissue
        Muscle cells / Muscle fibre       Contraction                   Muscle tissue