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Photosynthesis: Structure of a Leaf Interactive - …


We cannot fully study photosynthesis without knowing more about the structure of a leaf. The leaf is adapted to play a vital role in the process of photosynthesis.


Mosts green plants have leaves that are broad, flat and exposed to capture as much of the sun's energy (sunlight) needed for photosynthesis.

The network of veins in the leaf also carry water from the stems to the leaves. Glucose produced is also sent to the other parts of the plant from the leaves through the veins. Additionally, the veins support and hold the leaf flat to capture sunlight.

The stomata (tiny holes underneath the leaf) allows air in and out of the leaf. Stomata (single is called stoma) is usually at the bottom surface of the leaf but some plant species have them on the upper surface whiles other have them on both sides.
The stomata closes in the night to retain gases and moisture in the leaf cells, and opens during the day for gaseous exchange to continue.

Below is a close diagram of the leaf structure:




Take a good look at the diagram and the various parts of the leaf structure. It will be very useful on the next page.

The internal structure of the leaf is also adapted to promote efficient photosynthesis:

By quantifying these resistances using measured thicknesses, exposed mesophyll and chloroplast surfaces, and assumed diffusive properties, we were able to simulate the effect of various anatomical properties on photosynthesis.

Crassulacean acid metabolism, evolution, leaf anatomy, photosynthesis

The aim of this dissertation is to investigate how leaf anatomical properties and CO2 sources and sinks along the CO2­ diffusion pathway in C3 leaves affect the photosynthetic capacity of these leaves.

or closely-related pigments (substances that color the plant) are essential to the photosynthetic process.
- a compound leaf that is made up of many small arranged in pairs on either side of a long central (the ).

Internal Structure of Leaf (With Diagram) - Biology …

Label the two lower nodes (the first and second nodes) on the plant diagram.
- a leaf stalk; it attaches the leaf to the plant.
- a root is a plant structure that obtains food and water from the soil, stores energy, and provides support for the plant.

Most leaves are flat and contain ; their main function is to convert energy from sunlight into chemical energy (food) through photosynthesis.
- the part of the stem of a plant from which a leaf, branch, or aerial root grows; each plant has many nodes.

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Changes in water relations, photosynthesis and leaf anatomy …

These gaps are filled with gas that the plant uses (carbon dioxide - CO ) and gases that the plant is expelling (oxygen - O, and water vapor).
- the angle between the upper side of the stem and a leaf or petiole.
- a molecule in leaves that can use light energy from sunlight to turn water and carbon dioxide gas into sugar and oxygen (this process is called photosynthesis).

Leaf is best suited organ of photosynthesis

leaf top:anatomy of a leaf bottom:a double-leaf bascule drawbridge leaf

Compare between the anatomy of leaf in C3 and C4 …


- the angle between the upper side of the stem and a leaf, branch, or petiole.
- a bud that develops in the axil.
- the reproductive unit of .
- the structure that supports the .
- the area of the stem between any two adjacent nodes.
- an offshoot of the stem of a plant.
- an outgrowth of a plant that grows from a node in the stem.

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