How does an increase in temperature affect transpiration rate, and why?

How does an increase in humidity affect transpiration rate, and why?

How does an increase in light intensity affect transpiration rate, and why?

As humidity increases, the rate of transpiration       .

As wind speed increases, the rate of transpiration       .

True or False? Increasing the humidity around a leaf increases the rate of transpiration.

True or False? In bright light the stomata open for photosynthesis, which increases transpiration.

Define wilting.

Why does a plant become floppy when it wilts?

How can wilting benefit a plant?

True or False? A plant wilts when it loses water faster than it can be replaced.

Define a potometer.

What does a bubble potometer measure?

What does a mass potometer measure?

Why is a plant shoot cut underwater when setting up a potometer?

How can the effect of wind speed on transpiration be investigated with a potometer?

How can the effect of temperature on transpiration be investigated with a potometer?

What does it mean if the air bubble travels further along the tube?

Why should the leaves of the shoot be dried before starting?

A       is used to investigate the effect of environmental factors on the rate of transpiration.

When investigating the effect of one factor, all other       must be kept constant.

True or False? A bubble potometer measures the uptake of water by a plant shoot.

True or False? When investigating temperature, the wind speed can be allowed to change.

Define translocation.

Define a source in translocation.

Define a sink in translocation.

In which tissue does translocation occur?

In what form are sugars transported in the phloem?

What two substances are translocated in the phloem?

Why can transport in the phloem occur in different directions?

Translocation moves sucrose and amino acids from a      to a    .

The sugars and amino acids made in photosynthesis are transported in the      .

True or False? Sugars are transported through the phloem in the form of sucrose.

True or False? Translocation transports water and minerals through the plant.

Give an example of a part of a plant acting as a source.

Define transpiration.

From where does water evaporate during transpiration?

Through which structures does water vapour leave the leaf?

By which process does water vapour leave the leaf through the stomata?

State the functions of transpiration in a plant.

In which vessels does water travel from the roots to the leaves?

During transpiration, water evaporates from the leaf mesophyll cells and       out of the leaf through the stomata.

Transpiration is the loss of         from the leaves of plants.

True or False? Transpiration helps to keep the leaves of a plant cool.

True or False? Water vapour leaves the leaf by osmosis through the stomata.

Why does transpiration help to support the structure of a plant?

Define the transpiration stream.

Define transpiration pull.

What replaces the water lost from the leaves during transpiration?

How do the forces of attraction move water up the xylem?

By which process are more water molecules drawn into the leaf?

Forces of attraction between water molecules, known as      , maintain a continuous column of water in the xylem.

The upward force generated by transpiration in the leaves is called           .

True or False? Water travels up the xylem as a continuous column.

True or False? The transpiration stream moves water from the leaves down to the roots.

In which direction does water move in the transpiration stream?

Define xylem vessels.

Define phloem vessels.

How are the vascular bundles arranged in a stem?

Where is the vascular bundle found in a root?

State two functions of the cortex in a plant.

Why are xylem vessel walls thickened with lignin?

How does a xylem vessel being dead and hollow help its function?

Why do xylem cells have no cross walls?

The walls of xylem vessels are thickened with     , which strengthens them and supports the plant.

     vessels transport sucrose and amino acids, while     vessels transport water and minerals.

True or False? In the stem, the xylem is found closer to the inside of the vascular bundle than the phloem.

True or False? Xylem vessels are made of living cells full of cytoplasm.