Why did this happen ?

Pests are not controlled by the pesticides. Why does this happen?

Why did this athlete get muscle cramps after his running race ?

Some organisms or species adapt better and survive in a community of organisms. Why do you think this may happen ?

Why did the candle extinguish ?

Why did red spots appear on the steam or flower?

If it is raining in a village you don’t find rain in another village. Why do you think it is happening so?

We have conducted experiment that proves the release of oxygen when photosynthesis happens ? i) What are the plants used for this experiment ? Where do they grow ? ii) How did you conduct the above experiment ? In which context are large number of air bubbles released? Did you notice?

Answer the following questions by observing the diagram showing the experiment. Why did we study two leaves in this experiment ?

Priya’s mother said “It is very hard to stay at Vizag during summer” Why did she say so?

Why did the government of india fix the marriage age of boys (21 years) and girls (18 years)?