Question : Answer question numbers (a) -(d) on the basis of your understanding of the followingparagraph andthe related studied concepts :If youcarefully observe a cross-section of a leaf underthe microscope shown in Fig. 6.4, you will notice that some cells containgreendots. These green dots are cell organelles called chloroplasts whichcontain chlorophyll.(a)What is the role of these dots thatcontain chlorophyll.(b)What is the main difference you see between upper and lower epidermis ?(c)What is theroleof air spaces ?(d)Name the layer of cells that contain chloroplasts.

Question : Answer question numbers (a) -(d) on the basis of your under

1.	Question : Answer question numbers (a) -(d) on the basis of your understanding of the followingparagraph andthe related studied concepts :If youcarefully observe a cross-section of a leaf underthe microscope shown in Fig. 6.4, you will notice that some cells containgreendots. These green dots are cell organelles called chloroplasts whichcontain chlorophyll.(a)What is the role of these dots thatcontain chlorophyll.(b)What is the main difference you see between upper and lower epidermis ?(c)What is theroleof air spaces ?(d)Name the layer of cells that contain chloroplasts.
Answer» Solution :(a)These doescontaining chlorophyll are the sites for capturing sunlightresulting in its activation. (b)The main difference between the TWO epidermis is that thetwo epidermis is that the UPPER epidermisis continuouswhile lowerepidermis is discontinuousdue to presence ofstomatawhichallowgaseousexchange. (C) Air spaces just behind the lower epidermis contains `CO_(2)`from outside and removes `H_(2) O`frominside the cells. (d)Mesophyll layer is parenchymatous cells whichcontainchloroplasts and aremainsites ofphotosynthesis.