What is C/N ratio ?

C/N ratio is the ratio of carbohydrates and nitrogenous compounds which regulate the growth in plants. 
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Would a defoliated plant respond to photoperiodic cycle ? Why ?

No, a defoliated plant will not respond to photoperiodic cycle or stimulus. The photoperiodic is perceived by leaves as, the site of perception of light/dark duration are the leaves, which have been removed in a defoliated plant.
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Who isolated auxin and from where ?

Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedling.

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Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?


Different plant parts, tissues and cells grow at different rates in various stages of the life cycle of a plant. Moreover it is difficult to measure the increase in the protoplasm directly. Therefore, a number of parameters are taken into account to demonsstrate growth thrught out the life a flowering plants, so that a approximate growth rate. 
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What would be expected to happen if :

(a) GA3 is applied to rice seedlings.

(b) Dividing cells stop differentiating.

(c) A rotten fruit gets mixed with urripe fruits.

(d) You forget to add cytokinin to the culture medium


(a) The elongation of stem will occur at fast rate.

(b) An undifferentiated mass of cells is formed.

(c) The unripe fruits will ripen quickly.

(d) There will be no differentiation of shoot buds.

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