Science [4 marks Questions]

What are trophic levels ? Explain each trophic level with the help of example. 

Explain internal structure of heart with the help of neat and labelled diagram. Explain blood circulation in it. 

What are blood vessels ? Explain its types. 

Explain transportation in plants. 

Explain the following terms with one example each. 

Explain the oxidation and reduction reactions with the help of examples in terms of gain or loss of Oxygen. 

Name the chemical compound commonly used by your mother in kitchen for making crispy pakoras or cake. state its chemical formula and write the chemical equation of its production.

Write the importance of PH in our digestive system, and cause of tooth decay.

Write the preparation of baking soda with reaction and uses.

Write the preparation of bleaching powder with reaction and write five uses.

Write the preparation plaster of paris with reaction and uses.

Write the preparation of washing soda with reaction and uses.

Explain sodium hydroxide with reaction and uses.

Write practical applications of heating effect of electric current.

Write the Joule's law of heating? state the factors on which heat generated in a conductor due to electric current depends.

What is ohm's law? and verify ohm's law.

What is parallel resistor? and Derive the formula of equivalent resistance for parallel combinstion of resistors.

What is series combination. Derive the formula of equivalent resistance for series combination of resistors.