Transpiration and the leaf

Edited by Jamie (ScienceAid Editor), Taylor (ScienceAid Editor), SmartyPants

Ad

The Leaf

Below is a cross section of a leaf. This is what you would see if you looked down the leaf towards the stem.

cross sectional diagram of a leaf showing epidermis, palisade layer, mesophyll, and guard cells

The guard cells control the entry of carbon dioxide through the stomata by opening and closing. Therefore they close at night - reducing water loss.

  1. 1
    Shape
    .
    The long, thin shape of the leaf provides maximum surface area for receiving light.
    Advertisement
    Was this step helpful? Yes | No | I need help
  2. 2
    Cuticle
    .
    The waxy cuticle on the top of the leaf protects it from the elements and also prevents water from escaping.
    Was this step helpful? Yes | No | I need help
  3. 3
    Palisade layer
    .
    Cells have a lot of chloroplasts (containing chlorophyll) in them - making the most of the conditions high in light on the top of the leaf.
    Was this step helpful? Yes | No | I need help
  4. 4
    Veins
    .
    Phloem carry sugar and amino acids, and xylem carry water and mineral ions from the roots.
    Was this step helpful? Yes | No | I need help

Transpiration

For more information on this subject see water in plants.

Transpiration is the movement of water molecules through the plant - up from the roots, through Xylem vessels and evaporating out through the stomata in the leaves.

Certain conditions affect the rate of transpiration.

  1. 1
    Temperature
    .
    If it is warm, water is lost because of the increased movement of the molecules.
    Was this step helpful? Yes | No | I need help
  2. 2
    Wind Velocity
    .
    The wind will blow away molecules near the stomata.
    Was this step helpful? Yes | No | I need help
  3. 3
    Humidity
    .
    Moisture in the air will slow down water loss because the concentration gradient is small.
    Was this step helpful? Yes | No | I need help
    Advertisement

Questions and Answers

Are there any plants with leaves that emit all or most of their oxygen only from one side?

Are there any plants with leaves that emit all or most of their oxygen only from one side? Are there any plants with leaves that accept all or most of their carbon dioxide only on one side ?. Are there any plants with leaves that emit all or most of their oxygen only from one side? This message board keeps asking for details.

Was this helpful? Yes | No | I need help

ScienceAid QnA. This section is not written yet. Want to join in? Click EDIT to write this answer.

Referencing this Article

If you need to reference this article in your work, you can copy-paste the following depending on your required format:

APA (American Psychological Association)
Transpiration and the leaf. (2017). In ScienceAid. Retrieved May 29, 2017, from https://scienceaid.net/biology/plants/transpiration.html

MLA (Modern Language Association) "Transpiration and the leaf." ScienceAid, scienceaid.net/biology/plants/transpiration.html Accessed 29 May 2017.

Chicago / Turabian ScienceAid.net. "Transpiration and the leaf." Accessed May 29, 2017. https://scienceaid.net/biology/plants/transpiration.html.

If you have problems with any of the steps in this article, please ask a question for more help, or post in the comments section below.

Comments

ScienceAid welcomes all comments. If you do not want to be anonymous, register or log in. It is free.

Article Info

Categories : Plants

Recent edits by: Taylor (ScienceAid Editor), Jamie (ScienceAid Editor)

Share this Article:

Thanks to all authors for creating a page that has been read 102 times.

Do you have a question not answered in this article?
Click here to ask one of the writers of this article
x

Thank Our Volunteer Authors.

Would you like to give back to the community by fixing a spelling mistake? Yes | No