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:

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?

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

One set of a plant was grown at 12 hours a day and 12 hours night period cycles and it flowered while in the other set, night phase was interrupted by a flash of light and it did not produce a flower. Under which one of the following categories will you place this plant?
1. Darkness neutral
2. Day neutral
3. Short day
4. Long day

NCERT textbook says that plant growth is unique. What is the character of plant growth being referred to?
1. Plants have a closed growth
2. Capacity of unlimited growth throughout life
3. Complete absence of growth after a certain age
4. Growth without development

All the following contribute to an increase in girth of dicots and gymnosperms except: