Question

Виды листьев и их положение !!!!!!!

Answer 1

Два вида: простые (одна листовая пластина) и сложные (несколько пластин).
Распроложение листьев: очередное (по спирали), супротивное (друг напротив друга) и мутовчатое (когда в одном узле несколько листочков).

Answer 2

Листовые колючки — могут быть производными листовой пластинки — одревесневшие жилки (барбарис), или в колючки могут превращаться прилистники (акация). ...
Усики образуются из верхних частей листьев. ...
Филлодии — черешки, приобретающие листовидную форму, осуществляющие фотосинтез. Вот.

Answer 3

Types of Leaves and Their Arrangement

Leaves are essential plant organs responsible for photosynthesis, gas exchange, and transpiration. They come in various shapes, sizes, and arrangements. Let's explore different types of leaves and their arrangements:

1. Simple Leaves: Simple leaves consist of a single leaf blade attached to the stem by a petiole. They can have different shapes, such as oval, lanceolate, or elliptical. Examples of plants with simple leaves include maple, oak, and rose.

2. Compound Leaves: Compound leaves are composed of multiple leaflets attached to a common petiole. Each leaflet resembles a small leaf. Examples of plants with compound leaves include ferns, acacias, and poison ivy.

3. Palmate Leaves: Palmate leaves have leaflets that radiate from a central point, resembling the fingers of a hand. They are attached to the petiole at a single point. Examples of plants with palmate leaves include maple and horse chestnut.

4. Pinnate Leaves: Pinnate leaves have leaflets arranged on opposite sides of a central axis, resembling a feather. The leaflets are attached to the petiole along the axis. Examples of plants with pinnate leaves include ash and walnut.

5. Needle-like Leaves: Needle-like leaves are long, thin, and pointed, resembling needles. They are commonly found in coniferous trees such as pine, spruce, and fir. Needle-like leaves help reduce water loss and withstand harsh environmental conditions.

6. Succulent Leaves: Succulent leaves are thick and fleshy, storing water for the plant. They are often found in desert plants such as cacti and succulents. The thick leaves help the plants survive in arid environments.

7. Whorled Leaves: Whorled leaves are arranged in a circular pattern around the stem, with multiple leaves arising from the same node. Examples of plants with whorled leaves include oleander and periwinkle.

8. Opposite Leaves: Opposite leaves are arranged in pairs along the stem, with each pair of leaves located at the same level but on opposite sides of the stem. Examples of plants with opposite leaves include maple and lilac.

9. Alternate Leaves: Alternate leaves are arranged singly along the stem, with each leaf positioned at a different level. Examples of plants with alternate leaves include oak and sunflower.

It's important to note that leaf types and arrangements can vary across different plant species. The examples provided are just a few common ones.