It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

1. Cytokinin and Abscisic acid

2. Auxin and Ethylene

3. Gibberellin and Cytokinin

4. Gibberellin and Abscisic acid

In which of the following options the PGR is correctly matched with its two functions?

1. Abscisc acid - (i) Induce immediate stomatal closure in leaves.
                         (ii) Induce rooting is a twig.

2. Gibberellins - (i) Bolting in rosette plant.
                        (ii) Speed up the malting process in brewing industry.

3. Ethylene - (i) Delay leaf senescence.
                   (ii) Controls xylem differentiation.

4. Auxin - (i) Used to kill mocotyledonous weeds.
               (ii) Promotes nutrient mobilisation.

The typical growth curve in plants is:

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

1. IAA and gibberellin

2. Auxin and cytokinin

3. Auxin and abscisic acid

4. Gibberellin & abscisic acid

A. _______ hormone is most widely used PGR in
agriculture.
B. _______ hormone is related with Richmond Lang
effect.
         A             B
1. Auxin          CK
2. Auxin          GA
3. Ethylene      CK
4. ABA            CK

What conditions are required for vernalisation in
plants?

1. Low temperature, CO₂.
2. Low temperature, O₂, leaf.
3. Optimum temperature, O₂.
4. Low temperature, O₂.

Vernalisation stimulates flowering in

1. Zamikand

2. Turmeric

3. Carrot

4. Ginger

Ethephon hastens the fruit ripening in tomatoes and apple and accelerates abscission in flowers and fruits. Above statement indicates that ethephon must release –

1. ABA                                                          
2. C₂H₄
3. IAA                                                          
4. GA₇

The phytohormone which promotes rapid internode elongation in deep water rice plant is

How many of the following can help in breaking seed dormancy?
1. Changing the environmental condition like light & temperature.
2. Application of GA₃ or nitrates.
3. Chilling condition.
4. All the above