Key Points to Remember:#

• Cell Structure

• Typical size of a plant cell: Approximately 10 to 100 micrometers.

• Tissues

• Percentage of parenchyma tissue in a plant: Usually ranges between 70 to 90%.
• Ratio of collenchyma to sclerenchyma in a dicot stem: Roughly 1:4.

• Organs

• Number of petals in a flower Commonly exists in multiples of 3, 4, or 5 (e.g., 3, 4, 5, 10, 15, etc.). -Number of sepals in a flower: Typically 3, 4, or 5.
• Number of stamens in a flower: Often in multiples of 5 (e.g., 5, 10, 15, etc.).

• Reproductive Structures

• Number of microspores produced by a pollen sac: Range varies widely from approximately 100 to 10,000 microspores per pollen sac.

• Plant Growth and Development

• Rate of primary root growth: Approximately 0.5 to 5 centimeters per day.
• Duration of the cell division phase in the cell cycle: Around 8 to 12 hours. -Duration of the cell expansion phase in the cell cycle: Typically lasts from 12 to 48 hours.

• Plant Physiology

• Rate of photosynthesis: About 1 to 2 micromole (µmol) of carbon dioxide fixed per square meter of leaf area per second.
• Rate of transpiration: Roughly 0.5 to 2 millimoles (mmol) of water vapour lost per square meter of leaf area per second.
• Water potential of a well-watered plant: Generally ranges between -0.1 to -1.5 megapascals (MPa).
• Solute potential of a plant cell: Typically falls between -0.5 to -2 MPa.