Multiple Choice QuestionsWhich hormone is responsible for mobilization of storage food during seed germination ?
Auxin
Gibberellin
Cytokinin
Ethylene
Induction of flowering by low temperature in plants is
cryobiology
vernalization
phototropism
pruning
B.
vernalization
Vernalization is the induction of a plant's flowering process by exposing it to low temperature. It shortens the juvenile or vegetative phase of the plant. This term was coined by Lysenko in 1928.
Cryobiology is the branch of biology that studies the effects of low temperature on living things within Earth's cryosphere or in science.
Phototropism is the orientation of a plant or other organism in response to light, either towards the source of light or away from it.
Pruning is a horticultural and silvicultural practice involving the selective removal of certain parts of a plant, such as branches, buds or roots.
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
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
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