16299.The phase of growth which is the first phase and represents lag phase of growth curve is
Formative phase
Cell enlargement phase
Maturation phase
Stationery phase
16301.The type of germination shown by plants of marshy land is
Hypogeal
Epigeal
Viviparous
None of these
16303.Quiescence means-
Dormancy due to genetic reasons
Dormancy due to internal conditions
Dormancy due to external unfavourable conditions
Dormancy due to immature embryo
16304.Which of the following can stop flowring in short day plants
Longer but discontinuous dark period
Photopertiod longer than critical duration
Very short period
Any of these
16306.Natural cytokinins are synthesized in tissues that are:
Senescent
Dividing rapidly
Storing food material
Differentiating
16307.Which one of the followings is a gaseous plant hormone?
Ethylene
Gibberellin
IAA
Abscisic acid
16308.Seeds in which germination is stimulated by light are called
Photoblastic seeds
Thermoblastic seed
Positively photoblastic
Negatively photoblastic
16309.The annular and spirally thickened conducting elements generally developed in the protoxylem when the root or stem is
Elongating
Maturing
Differentiating
Widening
16310.Differentiation of shoot is controlled by:
High auxin : cytokinin ratio
High cytokinin : auxin ratio
High gibberellin : auxin ratio
High gibberellin : cytokinin ratio
16311.Opening of floral buds into flowers, is a type of:
Autonomic movement of variation
Autonomic movement of locomotion
Autonomic movement of growth
Paratonic movement of growth
16312.Cell elongation in internodal regions of the green plants takes place due to:
Cytokinins
Gibberellins
Ethylene
Indole acetic acid
16313.Which one of the following pairs, is not correctly matched?
IAA – Cell wall elongation
Abscisic acid – Stomatal closure
Gibberellic acid – Leaf fall
Cytokinin – Cell division
16314.Growth is a
Irreversible increase in size
Reversible increase in size
Reversible increase in shape
Increase in volume
16315.An enzyme that can stimulate germination of barley seeds is
α-amylase
Lipase
Protease
Invertase
16316.Dormancy in seeds of xanthium is due to
Seed coat imperable to water
Seed coat imperable to gases
Need for after ripening period
Mechanically resistant seed coat