Transpiration

Transpiration

Movement of evaporated water out of the xylem through tension

stomates

where does transpiration primarily occur in?

stomata

A pore or opening that is mostly found in the lower epidermis of leaf cells

guard cells

• The movement of these substances in transpiration is regulated by ____________

• They allow cells to bow and become turgid.

• They actively take in potassium so that water will enter due to osmosis

phototropins

what are guard cells that open stomates when exposed to blue light?

when plants close their stomates, often at night

when does transpiration stop?

True

True or False

When transpiration stops, water molecules within the xylem stay and adhere to plant cells until transpiration begins again

Potometer

device is used to measure the transpiration rate by measuring the rate of loss over uptake

xerophytes

a plant which needs very little water

Tension-Cohesion Theory

What theory explains how water moves upward through a plant’s xylem despite gravity?

Osmosis

What causes water to flow into the root cells of plants?

Root pressure

What term describes the upward force created by negative water pressure in roots?

Guttation

What process occurs when excess water is disposed from the leaf edges instead of through the stomata?

Cohesion

What is the term for water molecules sticking to each other?

Hydrogen bonding

What type of bonding is responsible for cohesion between water molecules?

allows water to form a continuous column, enabling upward flow.

Why is cohesion important in the xylem?

Xylem vessels and tracheids

What structures in plants transport water from the roots to the leaves?

It allows plants to maintain a continuous water column and air-water pressure through cohesion and transpiration-driven tension.

How does the Tension-Cohesion Theory help maintain pressure balance in plants?

hydrophytes

plants that thrive and dominate water habitats

cattails, water lilies, and lotuses.

examples of hydrophytes

Acacia trees, soapweed, desert lavender, and succulents

examples of xerophytes

halophytes

plants that generally grow in saline environments

Mangrove trees, rice grass, and sea lavender.

example of halophytes

mesophytes

plants that thrive in environments with moderate water availability, neither too wet nor too dry

Tulips, maple trees, and grasses

examples of mesophytes

leaf surface area

what are factors that affect transpiration rate?

Lower epidermis

Which side of the leaf has the shortest time of changing from blue to pink for cobalt chloride

herbaceous plants

which has higher rate of transpiration