List down the 4 types of tissues. in plants...?

Question

differentiate each in terms of their structure and function

Answer 1

Tissue types

Plants have four tissue types.

Vascular tissue transports, dermal tissue protects, meristematic tissue grows (cells divide), and ground tissue forms the rest of the plant.

Vascular tissue

Xylem

transports water and minerals from roots to leaves

composed of hollow, nonliving cells

tracheids- elongated with tapered ends, pits or depressions

vessel elements- larger, forms a continuous pipeline

Phloem

Transports organic nutrients, usually from leaves to roots

Phloem cells are living.

sieve-tube cells- no nucleus; connected to each other by plasmodesmata

Sieve plates are found at the ends of the cells.

Companion cells contain a nucleus and are located in close proximity to sieve-tube cells. They are connected to sieve tube cells by plasmodesmata.



Meristematic tissue

Areas within the plant that are capable of growth (cell division) are called meristems.

Primary Growth

Primary growth occurs only at the shoot and root tips in areas called apical meristems. Primary growth is responsible for elongating the plant. In areas that contain only primary growth, stem thickness increases by cell enlargement, not by the production of new cells.

Secondary Growth

Lateral meristems produce new cells that make the stems and roots thicker. This type of growth is called secondary growth. Secondary growth occurs only during the second and subsequent years and only in woody species.

There are two kinds of lateral meristems, the vascular cambium and the cork cambium. These lateral meristems form as rings within the plant body as the stem increases in thickness. The diagrams below illustrate how the vascular cambium divides to produce new xylem cells toward the inside of the vascular cambium and new phloem cells toward the outside.

Dermal tissue

outer covering of plant

It consists of closely packed cells that function to protect.

The epidermis covers the plant but is replaced by cork (periderm) in the stems and roots of woody plants.

The epidermis has a waxy covering called a cuticle that protects the plant from desiccation.

The periderm is the outer part of the bark.



Ground tissue

Ground tissue fills interior of plant. It contains parenchyma, collenchyma, and sclerenchyma cells.

Parenchyma

thin-walled

least specialized of the three cell types

found in all organs

usually functions in photosynthesis or storage

photosynthetic parenchyma have chloroplasts

parenchyma that function for storage have colorless plastids

Parenchyma can divide to produce more specialized types of cells.

Collenchyma

Collenchyma cells have thicker primary cell walls, especially at the corners.

A primary cell wall is one that is produced while the cell is growing.

Collenchyma often forms bundles just beneath the epidermis for flexible support of immature parts of the plant body.

Sclerenchyma

Sclerenchyma cells have thick secondary cell walls, usually toughened with lignin.

A secondary cell wall is one that is produced after the cell is mature. It is produced inside the primary cell wall.

Most sclerenchyma cells are nonliving. They function to support mature regions and produce hard parts (example: nut shells).

omit: contain fibers (long and slender) and sclereids (shorter, varied shape)

example: sclereids make nut shells hard

Answer 2

1. Vascular Tissue (xylem and phloem)
2. Mesophyll tissue (Parenchyma)
3. Epidermal Tissue
4. Collenchyma tissue
5. Sclerenchyma tissue
6. Aerenchyma (modified version of parenchyma)

Answer 3

I know this answer because I read the book 30 years ago. If you get off of the computer and read YOURS you will find the answer there. Sometimes it is best to do your own homework and quit playing around on the computer. Step away from the computer. You have to be in class in 2 hours.

Answer 4

Kleenex, Scott, Puffs and the House Brand.

Answer 5

vascular tissues,meristematic tissue,permanent tissues,conjunctive tissue

Answer 6

parenchyma (nutritive)
scelerenchyma(supportive)
chlorenchyma(food making and coloring)
fibrous(flexbility)

Answer 7

DERMAL, VASCULAR,GROUND, AND MERISTEMATIC