Question

Примеры листьев с перистым,пальчатым,параллельным и дуговидным жилкованием

Answer 1

с перистым жи. - листья розы, гороха
с пальчатым жи. - конский каштан, дуб
с параллельным жи. - тростник, тюльпан, ландыш
с дуговидным жи. -  злаки, овес, пшеница

Answer 2

Types of Leaf Venation

There are several types of leaf venation, which refer to the arrangement and pattern of veins in a leaf. The main types of leaf venation include percurrent, palmate, parallel, and arcuate venation. Let's explore each type in more detail:

1. Percurrent Venation: Percurrent venation, also known as pinnate venation, is characterized by a central midrib from which smaller veins branch out and extend towards the leaf margins. These smaller veins are called secondary veins. The secondary veins may further branch into tertiary veins. This type of venation is commonly found in dicotyledonous plants. An example of a leaf with percurrent venation is the leaf of a rose plant.

2. Palmate Venation: Palmate venation is characterized by several primary veins radiating from a single point at the base of the leaf, resembling the fingers of a hand. The primary veins extend towards the leaf margins, and smaller secondary veins may branch out from them. This type of venation is commonly found in palmate or lobed leaves. An example of a leaf with palmate venation is the leaf of a maple tree.

3. Parallel Venation: Parallel venation is characterized by veins that run parallel to each other from the base to the tip of the leaf. The veins do not form a prominent network but instead run parallel to the leaf margins. This type of venation is commonly found in monocotyledonous plants, such as grasses and lilies. An example of a leaf with parallel venation is the leaf of a corn plant.

4. Arcuate Venation: Arcuate venation, also known as curved venation, is characterized by veins that curve and form arches along the length of the leaf. The veins may originate from the midrib or the base of the leaf and curve towards the leaf margins. This type of venation is less common and can be found in certain plant species. An example of a leaf with arcuate venation is the leaf of a banana plant.

It's important to note that while these are the main types of leaf venation, there can be variations and combinations of these patterns in different plant species. Leaf venation is influenced by various factors, including the plant's evolutionary history and ecological adaptations.

I hope this information helps! Let me know if you have any further questions.