The typical growth curve in plants is:

1. sigmoid
2. linear
3. stair-steps shaped
4. parabolic

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.

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

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

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.

The phytohormone, which was first isolated from human urine, shows

Winter varieties resume their Growth in

Winter varieties should be planted in

The spring varieties are normally planted in…...and come to flower and produce grain……