List of top Science Questions

Waste can be managed by which of the following?
The substances which get decomposed by biological process are
Which disease may primarily be caused in humans by ultraviolet (UV) rays of the Sun?
The correct food chain is
Which substance cannot be decomposed in the environment?
At what stage of foetus does safe abortion occur?
Which of the following is an artificial ecosystem?
The hormone that controls the symptoms of puberty in adolescents is

Select from the following a statement which is not true about the burning of magnesium ribbon in air:

Differentiate between metals and non-metals on the basis of physical and chemical properties.
What is called absolute refractive index ?

The changes that occur during adolescence are called
 

Explain recycling of waste materials with examples.
Define respiration.
What is excretion ? Write the names of its two main parts.
What is pollination ?
Write the names of four organelles of a cell.
What are the harmful effects of aerosol chemicals ?
How is DNA the basis of heredity ?
What is phototropism ?
What is photosynthesis ? Describe it with a suitable diagram.
What is the difference between xylem and phloem ?
What is an indicator ? Write the name of an indicator.
What do you understand by short and long periods of periodic table ?
What is energy crisis ? Mention the measures to resolve it.