Make a list of some luminous objects and substances and classify them into natural and artificial sources of light.

A _____ is an artificial source of light.

A _____ is a natural source of light.

Make a list of the various consumers of the ecosystems, classify them according to mode of nutrition.

Read the ingredients and their proportion printed on bottles of cold drinks and juices and wrappers of ice creams. the natural and artificial ingredients added in them, Which precautions should be taken about their consumption ?

Make a list of 10 items you might use daily and find the rate of GST applicable on them.

Answer the following : Make a list of some examples in which contact and non contact forces are applied . Write the types of force .

Shadows change due to the change in relative positions of source of light and object.

What are the chemcial substances that make cloth, furniture, and elastic objects?

Paragraph based Questions : Read the paragraph and answer the, questions given below: Sulphuric acid is present in the acid rain and materials coming out of mines . You know that erosion of metals present in statues, bridges and buildings occurs due to it. Sulphuric acid is a source of energy for some species of bacteria like Acidophilum spp. and Acidobacillus ferrooxidans Hence. these bacteria can control the soil pollution occurring due to acid rain water soluble salts of uranium are present in the wastes produced during electroplating and in effluent released in the environment from the atomic energy Plant. Geobacter convert these salts of yranium into insoluble salts and thereby prevent those salts from mixing with groundwater sources. Which bacteria prevent these salts from mixing with ground water by converting them into insoluble salts?