List of top Science Questions

Which substance cannot be decomposed in the environment?
Which of the following is an artificial ecosystem?
At what stage of foetus does safe abortion occur?
The hormone that controls the symptoms of puberty in adolescents is
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.
What is the difference between xylem and phloem ?
Write the names of four organelles of a cell.
What is pollination ?
How is DNA the basis of heredity ?
What is phototropism ?
What is photosynthesis ? Describe it with a suitable diagram.
What are the harmful effects of aerosol chemicals ?
Define respiration.
What is excretion ? Write the names of its two main parts.
What are fossil fuels ?
What is energy crisis ? Mention the measures to resolve it.
Why have detergents replaced soap ?
What is the difference between an atom and an ion ?
Define ores.
What do you understand by short and long periods of periodic table ?
What is an indicator ? Write the name of an indicator.
Describe the structure and working method of a biogas plant.