______ is the occurrance of two or more type of flowers having different length of styles and stamens.

The ore having two different metal atoms is

Large unit of land having different types of plants and animals is known as :

What is the androecium called when stamens are arranged in one whorl and of different length ?

Consider the following three statements and select the correct option starting which ones are tube (T) and which ones are false (F). (i) Hybridisation is crossing of two or more types pf plants for bringing their traits together in progeny. (ii) Semi-dwarf rice varieties were derived from IR-8 and Taichung Native -1. (iii) Hybrid breeding have led to the development of several high yeilding resistant to water stress.

Fill in the blanks: When stamens and carpels of the same flowers mature at different times, it is called __________.

Name two different types of 'smog'. Explain briefly how are they formed ?