Question

complet tissue work

Answer 1

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tissue
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a group of cell that are similar in structure and or work together to achieve a function

plant tissue are classified into two types
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meristmatic tissue

group of cell that has ability to divide

they are present at only certain regions in plants called meristems

results in primary and secondary growth of plant

intercellular spaces are absent

classification of merismatic tissue on the basis
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of their location
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apical meristem
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present at growing tips of stem and root

cell division in this region results in elongation of stem.and root

involved in primary growth of plant

intercalary meristem
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present behihnd apex

present at base of leaf and internode region

it leads to increase in length of speed(primary)

lateral meristem
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also called secondary meristem

occurs along the sides of longitudnal axis of plant

causes growth in girth of stem and root

responsible for secondary growth

differentiation
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when the meristmatic tissue divides , some of the cell stay inside the meristem while some of them are thrown out of meristem these cellls are known as derivaties or differentiated cells. these cell mature and develop and becomes permanent tissue. this process is onown as differentiation

permanent tissue
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composed of cells which hav lost their ability to divide

they have definite shape size and thickness

it may be dead or living

it performs a specific function

permanent tissue are of two types
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simple permanent tissue - tissue made up of similar types of cellls
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1. parenchyma
chlorenchyma
aerenchyma

2. collenchyma

3. sclerechyma

4. epidermis

complex permanent tissue
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1. xylem

2. phloem

parenchyma
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basic packaging tissue

unspecialised live cells

thin cell walls

large intercellular space

function
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support to plants

Stores food

stores nutrient and water

chlorenchyma
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it contains chlorophyll and performs.photosynthesis


aerenchyma
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parenchyma with air cavities in aquatic plants

it helps in floating

collenchyma
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tissue responsible for flexibilty in plants

supporting and strengthening tissue

elongated living cells

irregularly thickened at corners

less intercellular space

where are they found
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leaf stalks below epidermis

expanded leaf

stem apex

function
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allows bending of leaves , stem without breaking.


provides mechanical support

sclerenchyma
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tissue responsible for stiffness in plants

long narrow and dead cells

thickened cell walls made of cellulose impregnated with lignin

simple pits are present in thickened cell walls

no intercellular space

where are they found?
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veins of leaves

hard covering of seeds and nuts

stems around vascular bundle

function
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Provide strength to plants

provides mechanical support

complex permanent tissue
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xylem
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transports water from root to diff parts of plants

consists of msotly dead cells

elements it is made of
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tracheids amd vessels
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tubular structure

conducts water and mineral vertically

xylem parenchyma
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store food

conduct water sideways


xylem fibres ( dead cells)
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support


phloem
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living cells except phloem fibre

seive tube
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tubular cells with perforated walls


comapnion cells
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regualtes metabolic activity of seive tube elements

phloem parenchyma
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suplirt seive tube and store's compound like starch

phloem fibres
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dead cells

gives mechanical strength

(i gave u upto plant tissue i m unable to type more so i cant give you about animal tissue)


hope helped
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