What is transpiration AP biology?

Transpiration. Process by which moisture is carried through the plants from the roots to the leaves, where it changes to water vapor and is released into the atmosphere; Evaporation of water provided the pull; occurs in xylem cells.

What is the control in transpiration lab?

The room temperature plant is the control in the experiment. The wind blowing on the plant should have caused evaporation to increase in the plant causing more transpiration. The heat hitting the plant increased the amount of water pulled in by the plant because it increased the rate of evaporation on the leaves.

How does Mist decrease transpiration?

How does mist on a plant affect the plants rate of transpiration? Hypothesis: If a plant is misted, then the rate of transpiration will be slowed down, because the moist environment and shielding of the plant creates less of an occurrence of evaporation.

What is the conclusion of transpiration?

The experiment of transpiration consisted of testing how fast different types of plants can evaporate water from their roots and out the leaves. Faster transpiration speeds in plants and trees is very beneficial to neighborhoods to regulate fresh air as well as control floods.

How does a potometer work?

A simple potometer is a piece of capillary tubing to which a plant has been connected. The water uptake is measured by recording the time taken for a bubble in the tube to move a set distance.

What is lenticular transpiration?

Loss of water that takes place through lenticels which are small minute pores present on the stem of many woody plants is called lenticular transpiration.

What are the control variables for transpiration experiment?

Control variables – temperature, air flow or draughts, adequate supply of water.

What factors affect transpiration?

The rate of transpiration is affected by several factors, including:

  • temperature.
  • humidity.
  • wind speed.
  • light intensity.

Does high humidity increase transpiration?

Increased humidity has a reduces transpiration. The lower the humidity the easier it is for the plant to release water. The type of plant is also a factor in how much a plant will transpire. For example plants grow in arid hot areas such as the desert will transpire less as they aim to conserve water.

Why does low humidity increase transpiration?

A hydrated leaf would have a RH near 100%, just as the atmosphere on a rainy day would have. Any reduction in water in the atmosphere creates a gradient for water to move from the leaf to the atmosphere. The lower the RH, the less moist the atmosphere and thus, the greater the driving force for transpiration.

What is mechanism of transpiration?

Driving force in this mechanism is the evaporation of water from the surface of the leaf (transpiration). The evaporation causes tension which results in the pull of the water column and ultimately water comes out of the stomata. So, transpiration is the driving force of water movement inside the plant.

What is a potometer in biology?

A potometer is a piece of apparatus designed to measure water uptake in a leafy shoot. There are 2 types of potometer – the bubble potometer and the weight potometer.

How is a potometer used to measure transpiration?

Investigating transpiration Under normal circumstances, the rate of water uptake gives a measure of the rate of transpiration . A simple potometer is a piece of capillary tubing to which a plant has been connected. The water uptake is measured by recording the time taken for a bubble in the tube to move a set distance.

What is cuticular and lenticular transpiration?

Cuticular Transpiration: It takes place through the thin cuticle covering the leaves of the plant. Lenticular Transpiration: It takes place through the opening on the stems of woody plants called lenticels.

What is the difference between lenticular and stomatal transpiration?

Transpiration occurring through lenticels i.e. minute openings on the surface of old stems is called lenticular transpiration. Stomatal transpiration is controlled by the plant by altering the size of the stoma where as this does not happen in case of lenticular transpiration.

What are the dependent and independent variables for the transpiration experiment?

The time of day is an independent variable because this will affect the dependent variable: the rate of transpiration. This is because the different times of day have different light and environmental conditions which will either slow or speed up the rate of transpiration.

What are the independent variables for the potometer?

Variables. Independent variable – time. Dependent variable – the distance moved by the bubble along the capillary tube. Control variables – temperature, air flow or draughts, adequate supply of water.

What structures are involved in transpiration?

What plant structures are involved in transpiration? The roots, stems, and leaves are all involved in the process of transpiration.

What causes an increase in transpiration?

Relative humidity: As the relative humidity of the air surrounding the plant rises the transpiration rate falls. It is easier for water to evaporate into dryer air than into more saturated air. Wind and air movement: Increased movement of the air around a plant will result in a higher transpiration rate.

Does wind affect transpiration?

Wind – Wind can alter rates of transpiration by removing the boundary layer, that still layer of water vapor hugging the surface of leaves. Wind increases the movement of water from the leaf surface when it reduces the boundary layer, because the path for water to reach the atmosphere is shorter.

How does temperature light intensity and wind affect transpiration?

Solution: Temperature: Transpiration is faster on hot summer days as compared to cold winters. Light intensity: The transpiration rate is increased due to the increase in light intensity. During daytime in the sunlight, the rate of transpiration is faster.

Why does darkness decrease transpiration?

If less water is being lost through transpiration the plant will absorb less water at the roots….Factors affecting transpiration.

Factor Effect on transpiration How to change this factor experimentally
Light intensity Darkness will cause the stomata to close causing a decrease in transpiration. Use a lamp.

What is the mechanism of opening and closing of stomata?

The mechanism of stomatal opening and closure The opening and closing of stomata depend on the turgor pressure, caused by the osmotic flow of water in the guard cells. When the guard cells are turgid, they expand resulting in the opening of stomata.

What is transpiration and mechanism of stomatal movement?

Stomatal transpiration takes place through the following steps: The water from the xylem of the leaf moves to the intercellular space above the stomata through osmotic diffusion. Opening and closing of stomata. Movement of water from the intercellular space to the external environment through stomata.

What is potometer method?

A potometer’ (from Greek ποτό = drunken, and μέτρο = measure), sometimes known as transpirometer, is a device used for measuring the rate of water uptake of a leafy shoot which is almost equal to the water lost through transpiration. The causes of water uptake are photosynthesis and transpiration.

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