Biology · Class 11 · Chapter 13
Plant Growth and Development
13 lessons107 min6 simulations10 practice questions
A seed becomes a seedling, the seedling becomes a plant, and the plant keeps adding length and girth for as long as it lives. This chapter asks how that growth is measured and plotted, how new cells take on their final form, why the same plant can make differently shaped leaves, and how five small chemical messengers, the plant growth regulators, switch growth on and off.
Also called: plant hormones · plant growth regulators · auxin and gibberellin
Lessons
13 lessons · 107 min
01Growth and why it never stops in plantsNCERT §13 (opening text) and §13.1–§13.1.16 min02Measuring growthNCERT §13.1.26 min03Phases of growthNCERT §13.1.36 min04Arithmetic and geometric growthNCERT §13.1.410 min1 sim05Absolute and relative growth rateNCERT §13.1.49 min1 sim06Conditions for growthNCERT §13.1.56 min07Differentiation, dedifferentiation and redifferentiationNCERT §13.29 min1 sim08Development and plasticityNCERT §13.35 min09Plant growth regulators and their discoveryNCERT §13.4.1–§13.4.28 min10AuxinsNCERT §13.4.3.110 min1 sim11Gibberellins and cytokininsNCERT §13.4.3.2–§13.4.3.37 min12Ethylene and abscisic acidNCERT §13.4.3.4–§13.4.3.514 min2 sims13Chapter reviewMust-know facts, traps and formulas11 min
Simulations
6 in this chapter
Arithmetic and geometric growthIn: Arithmetic and geometric growthAbsolute or relative growth?In: Absolute and relative growth rateCallus cultureIn: Differentiation, dedifferentiation and redifferentiationApical dominanceIn: AuxinsPlant growth regulator benchIn: Ethylene and abscisic acidABA against GAIn: Ethylene and abscisic acid