Question

Give two significant differences between:

(i) Transpiration and Guttation 

(ii) Chlorophyll ‘a’ and Chlorophyll b

Answer 1

(i)

Transpiration	Guttation
(i) Water loss in the form of vapour (ii) Occurs through stomata lenticel and cuticle (iii) Occurs through all aerial parts (iv) Dry conditions favour it	(i) Water lost in the form of water droplets (ii) Occurs through hydathode (iii) Occurs at vein end on the margin/tip of leaves (iv) Occurs in humid condition, do not favour transpiration

 (ii)

Chlorophyll ‘a’	Chlorophyll ‘b'
(i) Presence of methyl group (-CH3) at carbon atom 3 of pyrrolring 11. (ii) Chi. ‘a’ has molecular formula C55H72O5N4 Mg (iii) Blue-green in colour (iv) Soluble in petroleum ether (v) Primary photosynthetic pigment	(i) Instead of methyl group, there is present CHO group (ii) Chi ‘b’ has a molecular formula C55H70O6N4 Mg (iii) Yellow-green (iv) Soluble in methyl alcohol (v) Accessory pigment