| Name of Structure Structure Function | Pith Parenchyma with vacuoles and plastids Storage, support | Plasmodesmata Openings between sieve tubes connecting cytoplasm Transport of sap | Spongy cells Rounded, widely spaced, near stomata Allow gas exchange | Suberin Waxy molecule Waterproofing |
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What is the structure and function of a leaf?
The main function of a leaf is
to produce food for the plant by photosynthesis
. Chlorophyll, the substance that gives plants their characteristic green colour, absorbs light energy. The internal structure of the leaf is protected by the leaf epidermis, which is continuous with the stem epidermis.
What are the different leaf structures?
Petioles, stipules, veins, and a midrib
are all essential structures of a leaf. Within each leaf, the vascular tissue forms veins. The arrangement of veins in a leaf is called the venation pattern.
What are the different functions of leaves?
The two main functions performed by the leaf are
photosynthesis and transpiration
. Photosynthesis is the process by which green plants make their food from carbon dioxide and water in the presence of sunlight.
What are the three main structures of a leaf?
- All leaves have the same basic structure – a midrib, an edge, veins and a petiole.
- The main function of a leaf is to carry out photosynthesis, which provides the plant with the food it needs to survive.
- Plants provide food for all life on the planet.
What are the four functions of a leaf?
- Photosynthesis.
- Transpiration.
- Guttation.
- Storage.
- Defense.
What are the 5 parts of a leaf?
Petiole, leaf base, lamina, leaf apex, and leaf margin
are the external parts of a leaf.
What are the 4 types of leaves?
There are two different types of leaves –
simples leaves and compound leaves
. The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. They perform the function of photosynthesis and help in the removal of excess water from the aerial parts of the plant.
How are leaves best classified?
Leaves are classified as
either alternate, spiral, opposite, or whorled
. Plants that have only one leaf per node have leaves that are said to be either alternate or spiral. Alternate leaves alternate on each side of the stem in a flat plane, and spiral leaves are arranged in a spiral along the stem.
What are the characteristics of leaves?
- The leaf is a lateral dissimilar appendage of the stem.
- A leaf is always borne at the node of the stem.
- Generally, there is always an axillary bud in the axil of a leaf.
- It is exogenous in origin and develops from the swollen leaf primordium of the growing apex.
- The growth of leaf is limited.
What are 3 main functions of leaves?
The leaves perform three main functions such as
manufacture of food, interchange of gases between the atmosphere and the plant body and evaporation of water
.
What is the main function of flower?
The primary purpose of the flower is
reproduction
. Since the flowers are the reproductive organs of the plant, they mediate the joining of the sperm, contained within pollen, to the ovules — contained in the ovary. Pollination is the movement of pollen from the anthers to the stigma.
What is the function of petiole?
A petiole
attaches the leaf to the stem
and contains vascular tissue that provides a connection from the stem to permit sap to enter the leaf and the products of photosynthesis (carbohydrates) to be transported from the leaf to the rest of the plant.
What is the main function of veins in a leaf?
Veins are composed of xylem and phloem cells embedded in parenchyma, sometimes sclerenchyma, and surrounded by bundle sheath cells. The vein xylem
transports water from the petiole throughout the lamina mesophyll
, and the phloem transports sugars out of the leaf to the rest of the plant.
Which part is absent in a typical leaf?
Stipules
are the lateral appendages of the leaf borne at its base. They are present in many families of dicotyledons, but they are absent or very rare in monocotyledons. When these stipules are present, the leaf is said to be stipulate and when absent exstipulate.
How leaves are useful to us?
Leaves
provide food and air to help
a plant stay healthy and grow. Through photosynthesis, leaves turn light energy into food. Through pores, or stomata, leaves “breathe” in carbon dioxide and “breathe” out oxygen.
