Plant Homeostasis

What are the levels of organization in plants?

• Plants have cells, but not tissues.

• Plants are made up of cells, tissues, organs, and organ systems

• Plants contain cells and tissues, but not organs.

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What is the vascular tissue that carries water throughout a plant?

• phloem

• seedling

• xylem

______________, pores on leaves through which plants lose water and exchange carbon dioxide and oxygen.

• stomata

• seed

• stem

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_____________________ is a vascular tissue that carries sugars and other foods throughout a plant.

• stems

• phloem

• roots

• xylem

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Homeostasis is _________.

• controlling the environment
• maintaining internal balance
• not using any energy
• when plants grow towards light

Evaporative Cooling is when...

• some plants (eg: eucalypts) are able to change the orientation of leaves so they hang vertically during hot weather

• In extreme heat plants increase transpiration this leads to a loss of turgor pressure (water pressure inside plant cells) and leaves wilt

• stomata open, loss of water by transpiration

• some eucalypts can drop leaves during dry season

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Turgor Pressure is when...

• some plants (eg: eucalypts) are able to change the orientation of leaves so they hang vertically during hot weather

• In extreme heat plants increase transpiration this leads to a loss of water pressure inside plant cells and leaves wilt

• stomata open, loss of water by transpiration

• some eucalypts can drop leaves during dry season

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In extreme heat plant will respond by

• Evaportive cooling, Turgor pressure, leaf orientation, opening and closing stomata and reseedling

• Anti Freezing, Becoming Dormant and Vernilisation

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Leaf orientation helps the plant reduce heat by

• Decreases internal temperature by evaporative cooling

• Wilting allows the plant to

  reduce exposure of surface area to sun

• Reduce loss of water during heat of the day, reduces water stress

• Reduces surface area of leaf exposed to the sun

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Dormancy is beneficial to a plant in

• Heat

• Cold

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