Plant Growth and Development

Q1.ABA is also called the stress hormone because it:

• APromotes cell division under stress
• BStimulates stomatal closure and increases stress tolerance
• CPromotes flowering during drought
• DIncreases photosynthesis under stress

Q2.A student observes cells at different positions in a root tip. Cells closest to the tip show active division, cells slightly further show enlargement, and cells farthest show wall thickening. Which phase would be absent if the meristematic cells stopped dividing?

• AOnly the meristematic phase
• BOnly the elongation phase
• CAll three phases would eventually cease
• DOnly the maturation phase

Q3.The process by which cells derived from meristems mature to perform specific functions is called:

• ADedifferentiation
• BRedifferentiation
• CDifferentiation
• DDevelopment

Q4.Development is considered as the sum of:

• AGrowth and senescence
• BGrowth and differentiation
• CDifferentiation and senescence
• DGrowth and reproduction

Q5.Which PGR would you use to induce rooting in a twig?

• AGibberellin
• BAuxin
• CAbscisic acid
• DEthylene