41 6 Growthinmulticellularorganisms 120603003459 Phpapp02

7/25/2019 41 6 Growthinmulticellularorganisms 120603003459 Phpapp02

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CHAPTER 4 :

REPRODUCTION & GROWTH

4.6 Growth In MulticellularOrganisms


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LEARNING OUTCOMES

To explain briefy the necessityor growth in organisms;

To explain what growth is.


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The Necessity For Groth i!Or"#!is$s

To increase in size & change inshape.

To become more specific in form& structure to play vital rolesof life (respiration,photosynthesis)

To interact with externalenvironmental factors


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WHAT IS GROWTH%

GROWTH= an irreversible processwhich involves an increase in thenumber of cells size, complexity &organ functionsin the organisms

bo!y.

"uantitative changes bo!y size,mass & number of cells.

"ualitative changes shape, function& complexity#specializations.


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GROWTH STAGES

a) The stage o cell division The number o cells must rst increase

by mitosis.

Cells increase in geometric progression

!"#$!%&"%#!"$'''.

(ll daughter cells ormed are small identical to the parent cell*+ygote)


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b) The stage o cell elongation ,enlargement

-ust grow in si+e

ccurs by assimilation o ood into the cells.

/ynthesi+ing protoplasm

0acuolation absorption o water.

c) The stage o cell specialisation ,di1erentiation

-aximum si+e di1erentiate.

2eers to gradual changes in the structure o ageneral cell to turn it into a specialised cell orcarrying out a specic unction.

/pecic morphological physiological

changes.


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Cells tissue organ organ system complex organism

-ay occur throughout the lie cycle o atcertain times only.

(ll parts or certain parts only.

3n plants4 limited to the apical meristems cambium*lateral meristems).

5rowth development o the shoot alsoincludes growth o leaves leapromordia*small outgrowth)


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41 6 Growthinmulticellularorganisms 120603003459 Phpapp02

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