CBSE
Multiple Choice QuestionsHorizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings is brought about by
Auxins
Gibberellins
Ethylene
Kinetin
Kinetin
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
Bud dormancy is induced by
ABA
ethylene
IAA
gibberellic acid
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 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
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
Which hormone is responsible for mobilization of storage food during seed germination ?
Auxin
Gibberellin
Cytokinin
Ethylene
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
Induction of flowering by low temperature in plants is
cryobiology
vernalization
phototropism
pruning
