tissues

Question 1

what is a tissue

Answer 1

a tissue is a group of cells which perform the same function and have a common origin

Question 2

what are meristematic tissues and what are its types

Answer 2

these are a type of plant tissue
-their only function is to divide
TYPES;
1)apical meristem:located at the tip of the root,stem or leaves and at budding areas and provides growth in length
2)lateral meristem:located below the bark and provides growth in girth and diameter

Question 3

what are permanent tissues and how are they divided

Answer 3

these are a type of plant tissue
-they have a specific function
-non dividing
-mature meristematic tissue
They are divided into three types:
Protective,Supporting and Conducting

Question 4

protecive tissues

Answer 4

-Thick cell wall
-Eg;epidermis of leaves

Question 5

supporting tissues

Answer 5

parenchyma : -used for storage
-one large vacuole
-thin cell walls
-found in soft areas such as the cortex and pith

collenchyma : used for flexibility
-thick cell wall
-elongated cells
-found under the epidermis and in leaf stalks

sclerenchyma :used mechanical support
-made up of dead cells which are long and narrow
-thick walls made of lignin
-found in stem and veins of leaves

Question 6

conducting tissues

Answer 6

Xylem and Phloem

Question 7

Xylem

Answer 7

-conducts upward movement of water and minerals in plants
-has thick walled,elongated cells
-in the shape of tubular passages
-old xylem turns into wood
-four parts:xylem fibers,xylem parenchyma,tracheids and xylem vessels
dead tissue

Question 8

differentiate between xylem fibers and xylem parenchyma

Answer 8

Xylem parenchyma ;
-conducts water transport and storage of sugars and starch
-made of living cells
Xylem fibers ;
-provide mechanical support
-made of thick walled,dead,narrow sclerenchyma cells with tapering ends

Question 9

tracheids

Answer 9

-provide mechanical support
-made of dead cells which are elongated with a large cavity without any contents
-have highly dignified cell walls

Question 10

tracheae

Answer 10

-lignified,thick cell walls
-made of tubular cells
-transverse walls get dissolved and make a continuous water pipe

Question 11

phloem

Answer 11

-conducts bidirectional movement of food prepared by the leaves
-consists of seive tubes,companion cells,plhloem parenchyma and phloem fibers
-old phloem turns into the bark
-living tissue

Question 12

seive tubes and companion cells relationship

Answer 12

seive tubes
-non living
-transverse walls are perforated
-elongated and hollow to allow the transport of food
companion cells
-are situated right beside the seive tubes and provide nutrients for them as they are dead

Question 13

how are animal tissues divided

Answer 13

-epithilial tissues
-connective tissues
-muscular tissues
-nervous tissues

Question 14

epithilial tissues classification

Answer 14

1]squamous; flat irregular cells,found in blood vessels and lymph vessels
2]cuboidal; found in tubules such as the kidney tubule, salivary gland and sweat gland
3]columnar : tall,cyllindrical and brick-like cells,found in the inner lining of the stomach and intestines
it is further divided into
-glandular; large cells which secrete chemical substances,found in the sweat glands when it is folded inward to form a compact,hollow tubule
-ciliated; have a thread-like protoplasmic projection on the top which moves the cells
4]stratified; they have many layers,found in the cronea and skinnn