Which of the following is NOT an effect of ethylene?

• Promotes senescence and abscission of plant organs

• Breaks seed and bud dormancy

• Brings about horizontal growth of seedlings

• Hastens fruit ripening

• Hastens fruit ripening

Select the correctly matched pair

• C. Darwin and S.F. Darwin – Gibberellic acid

• F.W. Went – Auxin

• E. Kurosawa – Ethylene

• Skoog and Miller – Abscisic acid

• Skoog and Miller – Abscisic acid

One hormone stimulates the closure of stomata and another one influences the swelling of the axis in dicot plants. They are

• Gibberellins and ethylene

• Abscisic acid and cytokinins

• Gibberellins and cytokinins

• Auxin and cytokinins

• Auxin and cytokinins

Which of the following statements regarding photoperiodism is false?

• The response of plants to periods of light/day is termed photoperiodism

• The shoot apices cannot perceive photoperiods

• In day neutral plants there is no correlation between exposure to light duration and induction of flowering response.

• Shoot apices modify themselves into flowering apices prior to flowering

• Shoot apices modify themselves into flowering apices prior to flowering

Horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings is brought about by

• Auxins

• Gibberellins

• Ethylene

• Kinetin

• Kinetin

The cell derived from meristems differentiate and regain the capacity to divide by a phenomenon called

• Differentiation

• Dedifferentiation

• Redifferentiation

• Totipotency

• Totipotency

What is the site of perception of photoperiod necessary for induction of flowering in plants?

• Pulvinus

• Shoot apex

• Leaves

• Lateral buds

268.

It takes 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?

• Gibberellin and Cytokinin

• Gibberellin and Abscisic acid

• Cytokinin and Abscisic acid

• Auxin and Ethylene