The  stele  is  the  central  part  of  the root  or  stem  containing  the  tissues  derived  from  the  Procambium.  These  include  vascular  tissue.

The  main  function  of  the  stele  is  to  provide structural  support  to  the  plant.

TLS Online TPP Program

#Id: 8426

#XL - T Zoology

Senescence - A gradual decrease in fecundity and an increase in the probability of mortality.

TLS Online TPP Program

#Id: 8427

#XL - T Zoology

Principle of allocation - The observation that when resources are devoted to one body structure, physiological function, or behavior, they cannot be allotted to another. 

TLS Online TPP Program

#Id: 8428

#XL - T Zoology

Natural selection will favor those individuals that allocate their resources in a way that achieves maximum fitness.

TLS Online TPP Program

#Id: 8429

#XL - T Zoology

Trade off - A giving up of one thing in return for another.

Causes of trade off

More mortality in their offspring 

Limitation of food

TLS Online TPP Program

#Id: 8430

#XL - T Zoology

1. OFFSPRING NUMBER VERSUS OFFSPRING SIZE

2. OFFSPRING NUMBER VERSUS PARENTAL CARE

3. FECUNDITY AND PARENTAL CARE VERSUS PARENTAL SURVIVAL

TLS Online TPP Program

#Id: 8431

#XL - T Zoology