Question

Write the components and functions of plant tissue system.

Answer 1

Answer:

i think it is

Explanation:

Plant tissues. ... They differentiate into three main tissue types: dermal, vascular, and ground tissue. Each plant organ (roots, stems, leaves) contains all three tissue types: Dermal tissue covers and protects the plant, and controls gas exchange and water absorption (in roots).

Answer 2

Answer:

All the tissue of a plant which performs the same function regardless of position or continuity in the body may be considered to form together, a tissue system.

Each system usually consists of only one tissue or association of tissue which performs a common function and has the same origin.

On the basis of division of labour, three different tissues systems are found in the plant body (Sachs, 1875):

1. The epidermal tissue system

2. The ground or fundamental tissue system

3. The vascular tissue system

Explanation:

• Dermal/epidermal tissue covers and protects the plant, and controls gas exchange and water absorption (in roots).

• The dermal tissue of the stems and leaves is covered by a waxy, varnish-like cuticle that prevents evaporative water loss, mechanical injuries and potential parasites.
• Stomata are specialized pores that allow gas exchange through holes in the cuticle. Unlike the stem and leaves, the root epidermis is not covered by a waxy cuticle which would prevent absorption of water.
• Root hairs(epiblema), which are extensions of root epidermal cells, increase the surface area of the root, greatly contributing to the absorption of water and minerals.
• Trichomes, or small hairlike or spikey outgrowths of epidermal tissue, are present on the stem and leaves, and aid in defence against herbivores, and heating effects.

Ground/ fundamental tissue system:

-This extends from epidermis upto the centre of axis

(excluding vascular tissue).

It constitutes the following three layers:

Hypodermis

General Cortex

Endodermis

(a) Cortex-Cortex has been further divided into three-layer (Hypodermis, General Cortex, Endodermis)

(b) Pericycle

(c) Pith

• The ground/ fundamental tissue system carries out different functions based on the cell type and location in the plant.
• This includes parenchyma (photosynthesis in the leaves, and storage in the roots), collenchyma (shoot support in areas of active growth), and sclerenchyma (dead cells, help in shoot support in areas where growth has ceased)is the site of photosynthesis, and provides a supporting matrix for the vascular tissue, provides structural support for the stem, and helps to store water and sugars.

• Vascular tissue consists of a number of vascular bundles which are distributed in the stele.
• The stele is the central column of the dicot stem and all roots are surrounded by endodermis and consist of the pericycle, vascular bundles, medullary rays and pith.

The vascular bundle is made of specialized conducting tissues namely the xylem, phloem and cambium(a stripe of primary meristem).

The function of the vascular bundle is to conduct water and raw food materials from leaves to storage organs and to the growing region. The xylem and phloem always lie adjacent to each other in a vascular bundle.

Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a vital role in structural support in the stem.

Phloem tissue transports organic compounds from the site of photosynthesis to other parts of the plant.

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