Question

Строение проводяшей ткани? помогите плиз !!!!!!

Answer 1

Проводящие ткани обеспечивают транспорт веществ в теле растений.  От корней в стебель и листья осуществляется перенос минеральных веществ, всасываемых из почв, - восходящий ток. Он обеспечивается ксилемой, или древесиной.  Движение органических веществ, продуктов фотосинтеза к местам их использования или отложения в запас (к корням, плодам, семенам и другим органам) составляет нисходящий ток. Он осуществляется флоэмой, или лубом, располагающимся кнаружи от древесины.  Основными элементами ксилемы являются трахеиды и трахеи (сосуды) , окруженные древесными волокнами. 

Answer 2

Structure of Conductive Tissue

The conductive tissue in plants is responsible for the transportation of water, nutrients, and sugars throughout the plant. It consists of two main types of tissues: xylem and phloem.

Xylem is responsible for the transport of water and minerals from the roots to the rest of the plant. It is composed of several types of cells, including:

1. Tracheids: These are elongated cells with tapered ends and thick secondary cell walls. They are found in all vascular plants and are responsible for the majority of water transport. 2. Vessel Elements: These are wider and shorter cells with perforations in their cell walls. They are found in angiosperms (flowering plants) and are more efficient in water transport compared to tracheids. 3. Parenchyma Cells: These are living cells that provide support and store nutrients in the xylem.

Phloem is responsible for the transport of sugars, amino acids, and other organic compounds from the leaves to the rest of the plant. It is composed of several types of cells, including:

1. Sieve Tube Elements: These are elongated cells that form a continuous tube for the transport of sugars. They lack a nucleus and other organelles, allowing for efficient transport. 2. Companion Cells: These are closely associated with sieve tube elements and provide metabolic support to them. They have a nucleus and other organelles. 3. Phloem Parenchyma Cells: These are living cells that provide support and store nutrients in the phloem.

The xylem and phloem are usually found together in vascular bundles, which are scattered throughout the plant. In stems, the vascular bundles are arranged in a ring, while in roots, they are arranged in a central cylinder.