Sunday, July 15, 2012

chapter 8


Answers key

OBJECTIVE QUESTIONS
  1. C
  2. A
  3. B
  4. B
  5. C
  6. D
  7. C
  8. C
  9. B  
  10. A

STRUCTURED QUESTIONS

1.     (a) to make the studying  of organisms easier and to facilitate international discussions.

b) kingdom and example

Kingdom
Example of organism
Animalia
Cat
Plantae
Balsam plant
Fungi
Mushroom
Protista
Amoeba
Monera
Bacteria

C)   (i) I   :  class
               II  : order
               III : family
               IV : genus
           (ii) Periplanetta americana

            (iii) Linnaeus binomial system
d) No. this is because a kingdom  comprises several phyla.

e) A group of organisms which are capable of interbreeding to produce fertile
    offsprings   








2.     (a) Apis mellifera : S
           Pediculus humanus : T
          Chelifer pseudoncortionida : R
           Julus terrestris  : Q
           Astacus torrentium  :P
      (b) The first part is the name of the genus and the second part is the name of
            the species.

      (c) These terms are based on personal opinions and therefore are subjective.

      (d) *All of them have jointed legs
           * All of them have exoskeletons made of chitin.

ESSAY QUESTIONS

1 (a) Biodiversity is defined as the great variety of organisms on earth.
    (b) The importance of biodiversity :
         - provides various biological products to humans and play important roles in
           the economy                                                                              (1)
         - the  variety of species and ecosystems provide various environmental
           services to humans as well as to other species including pollination,
           nutrient cycling, regulating of the atmospheric composition and climate (1)
        - All species are supported by the interactions among other species and
          their ecosystem for food, shelter and other basic needs.               (1)
        - the diversity of plants and animals means a diversity in genetic pool.
          Genetic variation observed in the different populations of plants and animal  
          species                                                                                       (1)
  1. (a)5 kingdoms : Monera,  Protista, Fungi, Plantae, Animalia           (5)
(b) characteristics of organisms                               

Monera kingdom
Plantae kingdom
-Unicellular organisms (1)
-Absence of nuclear membrane (1)
-Cell wall present (1)
-Simple organization(1 )
-No tissue formation since the organisms are unicellular (1)

-Multicellular plants (1)
-Cell wall present (1)
-Chlorophyll present (1)
-Most of the organisms have tissues (1)

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