Question

Укажіть різновид тканин ,що утворюють закриті судинно-волокнисті пучки рослин. 1.твірна 2.видільна 3.ситоподібна трубка 4.судини 5.хлорофілоносна паренхіма 6.механічка має бути 3 відповіді

Answer 1

Прості пучки за структурою найпримітивніші. Вони складаються з однорідних гістологічних елементів - лише з трахеїд або лише з ситоподібних трубок.Загальні пучки складаються з судин, трахеїд і ситоподібних трубок.Складні пучки, крім провідних тканин, мають ще тканини паренхіми.Судинно-волокнисті пучки складаються з елементів складного провідного пучка, оточених механічною тканиною. Ці пучки дуже міцні.

Answer 2

Types of Tissues Forming Closed Vascular Fibrous Bundles in Plants

1. Phloem: The phloem tissue is responsible for the transport of organic nutrients, such as sugars and amino acids, from the leaves to other parts of the plant. It consists of several cell types, including sieve tube elements, companion cells, phloem fibers, and phloem parenchyma cells. The sieve tube elements form the main conducting cells, while the companion cells provide metabolic support. Phloem fibers provide mechanical support, and phloem parenchyma cells store food reserves and perform various metabolic functions. [[1]]

2. Xylem: The xylem tissue is responsible for the transport of water and minerals from the roots to the rest of the plant. It consists of several cell types, including vessel elements, tracheids, xylem fibers, and xylem parenchyma cells. Vessel elements and tracheids are the main conducting cells in xylem. Vessel elements are shorter and wider, while tracheids are longer and narrower. Xylem fibers provide mechanical support, and xylem parenchyma cells store food reserves and perform various metabolic functions. [[2]]

3. Sclerenchyma: Sclerenchyma tissue provides mechanical support to the plant. It consists of thick-walled cells with lignified secondary cell walls. Sclerenchyma cells are dead at maturity and have a rigid structure. They are found in various parts of the plant, such as stems, leaves, and fruits. Sclerenchyma cells can be classified into two types: fibers and sclereids. Fibers are long and slender cells that provide tensile strength, while sclereids are shorter and have irregular shapes, providing additional mechanical support. [[3]]

Please note that the information provided above is based on search results and may not cover all possible variations of tissues forming closed vascular fibrous bundles in plants.