Question : (a)Identify the parts A-D(b)i.Name the layer where light is trapped.(ii)What determines the function of 'C' and how ?(c)Give reason why A is present where it is and not on D ?(d)How are leaves best adaptated to perform theirfunctions.

Question : (a)Identify the parts A-D(b)i.Name the layer where light

1.	Question : (a)Identify the parts A-D(b)i.Name the layer where light is trapped.(ii)What determines the function of 'C' and how ?(c)Give reason why A is present where it is and not on D ?(d)How are leaves best adaptated to perform theirfunctions.
Answer» Solution :(a)A - Waxy cuticle , B - CHLOROPLAST, C - Guard cell , D - Lower epidermis (i)Since .B. - Chloroplasts are presentin Mesophyll, hencephotosynthesis occurs here only because light is TRAPPED here. (ii).C. are guard cells and their functionis to regulate opening and closing of stomata. This is regulated by water. The guard cells stretchoutward thusopeing the stomata whentheytake up water from neighbouringcells and close them by giving up water. (c) .A. iswaxycuticlewhich frflectsbackexcess light, thushelps in loweringthe temperatureon leaf surface as theupper epidermis is DIRECTLY exposed to sunlight. It is for this reason that it is not present on lower epidermis. (d) Adaptations of leaves are :(i)Leaves are flattened ORGANS which provides more surface areafor maximu absorption of sunlight . (ii)Theyare green because of large number of chloroplastspresent which have chlorophyll necessaryfor photosynthesis . (iii)Stomata on lower epidermis help in exchange ofgases but also transpiration as not presenton upper epidermis. (iv)Large number of veins for good conduction of water and also food.