Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in

(a) vessels and tracheid differentiation
(b) leaf abscission
(c) annual plants
(d) floral parts

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Importance of day length in flowering of plants was first shown in 
(a) Lemna
(b) tobacco
(c) cotton
(D) Petunia

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Opening of floral buds into flowers, is a type of:-
(a) autonomic movement of locomotion
(b) autonomic movement of variation
(c) paratonic movement of growth
(d) autonomic movement of growth

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“Foolish seedling" disease of rice led to the discovery of:-
(a) GA
(b) ABA
(c) 2,4-D
(d) IAA

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Which one of the following pairs, is not correctly matched?
(a) Abscisic acid - Stomatal closure
(b) Gibberellic acid - Leaf fall
(c) Cytokinin - Cell division 
(d) IAA - Cell wall elongation

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How does pruning help in making the hedge dense:-

(a) It induces the differentiation of new shoots from the rootstock

(b) It frees axillary buds from apical dominance

(c) The apical Shoot grows faster after pruning

(d) It releases wound hormones

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Treatment of seed at low temperature under moist conditions to break its dormancy is called ?

(a) scarification
(b) vernalization
(c) chelation
(d) stratification

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An enzyme that can stimulate germination of barley seeds is:-

(a) α-amylase   (b) lipase

(c) protease      (d) invertase

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The aquatic plant Limnophila has leaves of more than one shape. The condition is described as

(1) polyphylly

(2) amphiphyly

(3) heterophylly

(4) biphylly

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Vernalization is the process of
(a) flower induction by high temperature treatment
(b) inhabitation of flowering by low temperature treatment
(c) flower induction by light treatment
(d) acceleration of the ability of a plant to produce flowers by chilling treatment

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