Nature of Matter: Elements, Compounds, and Mixtures — Science STD 8 — Question

How do lenses refract light?

Give the reason for the drafting of Red Data Book.

Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?

Where do Rhizobium bacteria live? What is their function?

What is the unique feature of the biodiversity found in Pachmarhi Biosphere Reserve ?

Why does the increased level of nutrients (or fertilizers) in the lake water affect the survival of aquatic organisms (like fish)?

Name the product of coal which is thick black liquid having an unpleasant smell.

Name any five substances used in everyday life which are manufactured starting from the products of coal tar.

Is it correct to worry about the bodily changes that occur during adolescence?

If the materials used for constructing a building were good conductors, do you think lightning will strike the building? Will the lightning conductor be still required to be installed in the building?