There are two columns, column 1 contains a set of words & column 2 contains a set of sentences. Write the number of sentence from column 2 in the boxes given after the words in column 2 to match the write that defines the sentences of column 2 completely.
1 -study of relation of plants and animals to their surroundings.
2 -one who believes in god.
3 -blocking of light from one heavenly body by another.