Topics from May 2017 Why is the colour of leaves green? Posted by Keshav Jain on Tuesday, May 9. 2017 Why do trees shed their leaves? Posted by Keshav Jain on Tuesday, May 9. 2017 Why do flowers have fragrance? Posted by Keshav Jain on Tuesday, May 9. 2017 How do we estimate the age of a tree? Posted by Keshav Jain on Tuesday, May 9. 2017 Why are some fruits sweet while others are sour? Posted by Keshav Jain on Tuesday, May 9. 2017 What is the difference between fruits and vegetables? Posted by Keshav Jain on Tuesday, May 9. 2017