What does the smog indicate ?

A complex of the type [M(A A)_2X_2]^(n+) is known to be optically active. What does this indicate about the structure of the complex? Give an example of such complex.

Observe the diagram carefully. What does it indicate?

What does 'Red' indicate in the IUCN Red list(2004)?

In a girdled plant, when water is supplied to the leaves above the girdle, leaves may remain green for sometime then wilt and ultimately die. What does it indicate?