The plant of arid regions with flat green stem carrying out photosynthesis is

Stems of which plant contain chlorophyll & become flat to carry out photosynthesis ?

Answer the following question How can you prove that the leaves other than green also carry out photosynthesis ?

Look at the acivities listed below. Reason out whether or not, work is done in the light of your understanding of the term work. A green plant is carrying out photosynthesis.

If a green plant is kept in dark with proper ventilation, can this plant carry out photosynthesis ? Can anything be given as supplement to maintain its growth or survival ?