Which hormone is responsible for fruit ripening:
1. Ethylene
2. Auxin
3. Ethyl chloride
4. Cytokinin
Geocarpic fruits are:
1. Carrot
2. Radish
3. Ground nut
4. Turnip
By which action a seed coat becomes permeable to water:
1. Scarification
2. Stratification
3. Vernalization
4. All of the above
Which of the following PGR is present in coconut milk which is used in tissue culture?
1. Cytokinin
2. Auxin
3. Gibberellin
4. Ethylene
Which pigment absorbs the red and far red light:
1. Cytochrome
2. Phytochrome
3. Carotenoids
4. Chlorophyll
Seed dormancy is due to:
1. Ethylene
2. Abscisic acid
3. IAA
4. Starch
Differentiation of shoot is controlled by:
1. High auxin : cytokinin ratio
2. High cytokinin : auxin ratio
3. High gibberellin : auxin ratio
4. High gibberellin : cytokinin ratio
Nicotiana sylvestris flowers only during long days and N. tabacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross-fertilized to produce self-fertile offspring. What is the best reason for considering N. sylvestris and N. tabacum to be separate species:
1. They cannot interbreed in nature
2. They are reproductively distinct
3. They are physiologically distinct
4. They are morphologically distinct
Coconut milk factor is:
1. An auxin
2. A gibberellin
3. Abscisic acid
4. Cytokinin