Which hormone is responsible for mobilization of storage food during seed germination ?

• Auxin

• Gibberellin

• Cytokinin

• Ethylene

Bud dormancy is induced by

• ABA

• ethylene

• IAA

• gibberellic acid

Induction of flowering by low temperature in plants is

• cryobiology

• vernalization

• phototropism

• pruning

Which of the following plant growth hormone increases the yield of sugar by increasing the length of stem in sugarcane?

• Cytokinin

• Auxin

• Abscisic acid

• Ethylene

• Ethylene

One hormone hastens the maturity period in juvenile conifers, a second hormone controls xylem differentiation while the third increases the tolerance of plants to various stresses and they are respectively-

• Auxin, Gibberellin and Cytokinin

• Gibberellin, Auxin and Cytokinin

• Gibberellin, Auxin and Ethylene

• Gibberellin, Auxin and ABA

• Gibberellin, Auxin and ABA

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

157.

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