4[1].7 FORM 5

LEARNING OUTCOMES
• I d e n t i f y t h e p ar ame t e r s u s e d i n
t h e me as u r e me n t o f g r o wt h ;

• D e s c r i b e t h e s i g mo i d g r o wt h c u r ve
o f an o r g an i s m;

• Re l at e t h e s h ap e o f t h e g r o wt h
c u r ve t o t h e g r o wt h p h as e s o f an
o r g an i s m;

• Ex p l ai n t h e s h ap e o f t h e g r o wt h
c u r ve o f an i n s e c t .

PARAMETER IN MEASUREMENT OF
GROWTH
• Length or height
– Easily measured using a ruler

• Volume
– Takes into consideration the length,
width & height.
– Irregular shapes  determination a
difficult task.

PARAMETER IN MEASUREMENT OF
GROWTH
• Fresh mass
– Closely related to volume.
– Easily determined using a weighing
scale.
– Not be an accurate  changes with the
water content.
• Dry mass
– After all its water has been removed.

S ig m o id G R O W T H
C U R VE
• Gr o wt h i s r ap i d d u r i n g t h e i n f an t
& c h i l d h o o d s t ag e s , h i g h e s t
d u r i n g t h e ad o l e s c e n t s t ag e .

• F e mal e g r o wt h f as t e r  p u b e r t y
e ar l i e r ( ag e 1 2 ) , mal e ( ag e 1 4) .

• Mal e s h ave a l o n g e r p e r i o d o f
g r o wt h ( u n t i l 1 8 ye ar s o l d ) ,
b e c au s e ad u l t mal e s ar e g e n e r al l y
t al l e r t h an ad u l t f e mal e s .

INSECT GROWTH CURVE
• D iscontinuous growth  have hard & inelastic
exoskeleton  lim its growth
• N eed to shed their exoskeleton from tim e to tim e 
ecd ysis.
• Ecd ysis : new, soft exoskeleton grows beneath 
taking a lot of air @ water to expand its bod y  old
exoskeleton cracked  tissues build s to fill the
spaces  new exoskeleton hard ens.
• Period between 2 ecd yses  instar.

4[1].7 FORM 5

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4[1].7 FORM 5