Vital functions.

Living things perform three vital functions:
NUTRITION, REPRODUCTION AND INTERACTION. 

                                   NUTRITION:
   -Living things obtain nutrients from their environment 
     and transform them into energy. 
   -This energy allows them to live, grow and develop.

   -Plants produce their own food through photosynthesis.
   -Animals feed on other living things. 
   -Decomposer, feed on the remains of dead plants and animals. 
      (fungi and bacteria are decomposers) 

                                  REPRODUCTION:
  

Reproduction can be: sexual or asexual.
ASEXUAL REPRODUCTION occurs when only one organism is required:
                                                    -bacteria
SEXUAL REPRODUCTION    occurs when two different types of indiviual are required:
                                                   - male and female.



                                 INTERACTION:
All living things interact with their environment. 
   -stimulus: a change in the enviornment can cause a reaction. 
   -response: the reaction.  







.............................................................................................................................................
EXPLAIN 
WHY 
ANIMAL CELLS
DO NOT HAVE  CHLOROPLASTS.


  Animal cells do not have chloroplast 
             because:
       -they do not perform 
       -the process of photosynthesis. 



WHAT STIMULI   DO   SUNFLOWERS
                   RESPOND TO?


Sunflowers respond to the stimuli of :
               light and water.