Importance of day length in flowering of plants was first shown in 

1. Lemna

2. tobacco

3. cotton

4. Petunia

Opening of floral buds into flowers, is a type of:-

1. autonomic movement of locomotion

2. autonomic movement of variation

3. paratonic movement of growth

4. autonomic movement of growth

“Foolish seedling" disease of rice led to the discovery of:-

1. GA

2. ABA

3. 2,4-D

4. IAA

Which one of the following pairs, is not correctly matched?

1. Abscisic acid - Stomatal closure

2. Gibberellic acid - Leaf fall

3. Cytokinin - Cell division 

4. IAA - Cell wall elongation

How does pruning help in making the hedge dense:-

1. It induces the differentiation of new shoots from the rootstock

2. It frees axillary buds from apical dominance

3. The apical Shoot grows faster after pruning

4. It releases wound hormones

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

1. scarification

2. vernalization

3. chelation

4. stratification

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

1. α-amylase   

2. lipase

3. protease     

4. invertase

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

1. vessels and tracheid differentiation

2. leaf abscission

3. annual plants

4. floral parts
 

One of the synthetic auxin is 

1. NAA

2. IAA

3. GA

4. IBA

Coiling of garden pea tendrils around any support is an example of 
1. thigmotaxis
2. thigmonasty 
3. thigmotropism
4. thermotaxis