Which reaction is very useful to plants?

Which isotope is very useful to treat goitre?

Some flowers of common pancy do not require pollinators for their pollination but still this property is not very useful for plants because

Some flowers of common pancy do not require pollinators for their pollination but still this property is not very useful for plants because

Which of the following drug is a very effective sedative and pain killer, and is very useful in patients who have undergoes surgery ?

Name the method which is very useful for producing semiconductors.

Write a material , which is very useful to show dispersion of light ?

Which is very useful from the audio visual point of view

Which of the following is used in plants?