List two items which can be easily recycled, but we generally throw them in the dust- bins.

Write the atomic numbers of two elements 'X' and 'Y' having electronic configuration 2,8,2 and 2,8,6 respectively.

What is heredity?

"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.

The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should the position of the object' be relative to the mirror? Draw ray diagram to justify your answer.