Distinguish between the following pairs on the basis of words indicated in the brackets ( )

Light reaction and Dark reaction (end products)

Distinguish between the following pairs on the basis of words indicated in the brackets ( )

Producers and Consumers (organisms)

Distinguish between the following pairs on the basis of words indicated in the brackets ( )

Stoma and Stroma (structure)

Given below is a schematic diagram to illustrate some aspects of photosynthesis.

(a) Fill up the gaps, in blank spaces (1-4), by writing the names of the correct items.

(b) What phenomenon do the thick arrows A and B indicate?