2.3: Plant tissues, organs and systems Flashcards
Name six plant tissues.
Epidermal, palisade mesophyll, spongy mesophyll, xylem, phloem, meristem.
“For each of the following tissues, describe their function:
epidermis, palisade mesophyll, spongy mesophyll, xylem, phloem, guard cells.”
“1. Epidermis: To cover and protect
- Palisade mesophyll: The site of photosynthesis
- Spongy mesophyll: Gas exchange (although also happens in #2)
- Xylem: Transport of water and dissolved ions
- Phloem: Transport of sugars made in photosynthesis
- Guard cells: To allow gas exchange and control water loss”
Name three plant tissues.
The epidermis, the palisade mesophyll, the spongy mesophyll, the xylem, the phloem, guard cells.
What is transpiration?
The movement of water from the roots to the leaves, eventually leaving the leaves via evaporation.
Name four factors which affect the rate of transpiration in plants.
“1. Temperature
- Humidity
- Air movement
- Light intensity”
Describe how increasing temperature will affect transpiration rate.
At first, as the temperature increases, the transpiration rate will increase. But beyond a certain temperature the transpiration rate will…
Describe how increasing each of the these factors will affect the rate of transpiration: temperature, humidity, air movement and light intensity
Temperature, air movement and light intensity will increase the rate of transpiration. Humidity will descrease it.
Name three plant organs.
Leaves, stems and roots.
What is translocation?
The movement of sugars from the leaves to the rest of the plant.
Describe the adaptations of xylem tissue.
Hollow tubes strengthened by lignin.
Describe the adaptations of phloem tissue.
Elongated cells with pores in the end cell walls to aid the movement of dissolved sugars.
What is the role of stomata and guard cells?
To control gas exchange and water loss.
