Class 9 Biological Diversity

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  1. The organisms that have not changed much in the process of evolution are called _____ organisms.
  2. Classification of life forms is closely related to their _______.
  3. _______ is a particular form or a particular function found in a large number of the organism.
  4. At ____ level, organisms look alike and are able to breed with one another.
  5. _________ is the largest category with related classes grouped together.

very Short Answer Type Questions

  1. Why there is a need for systematic naming of living organisms.
  2. Define the term species.
  3. What is nomenclature?
  4. Who devised a binomial system of nomenclature?

Short Answer Type Questions

  1. Write three conventions that are followed while writing scientific names of the species
  2. The biological field of taxonomy classified organisms based on their evolutionary relationships. Indicate the correct sequence of these levels of taxa.
  3. Class, Species, Genus, Family, Phylum, Order, Kingdom
  4. Write down the hierarchical classification of a human?
  5. Rewrite the scientific names of following organisms in their correct form.
Incorrect naming Correct naming
a.      felisdomesticus
b.      Ficusreligiosa
c.       AzadirachtaIndica
d.      Tigris Panthera

Answers

Fill in the Blanks

  1. Primitive Evolution      3.Characteristic            Species            Phylum

Short Answer Type Questions

  1. The scientific name for an organism is essential to identify living organisms anywhere in the world.
  2. A species is a group of organisms, with similar structure, function, and behaviour that are capable of interbreeding with one another.
  3. Nomenclature is the process of giving scientific names to plants and animals.
  4. Carl Linnaeus devised a binomial system of nomenclature in which an organism is given two names.

Short Answer Type Questions

  1. Convention that is followed while writing scientific names of the species are
  • The name of the genus begins with a capital letter.
  • The name of the species begins with a small letter.
  • When printed, the scientific name is given in italics.
  • When written by hand, the genus name and the species name have to be underlined separately.
  1. Kingdom- Phylum-Class-Order-Family-Genus-Species.
  2. The hierarchical classification of human is:

Kingdom- Animalia

Phylum- Chordata

Class- Mammalia

Order- Primate

Family- Hominidae

Genus- Homo

Species- sapiens

Incorrect naming Correct naming
a.       FelisDomesticus Felisdomesticus
b.      ficusreligiosa Ficusreligiosa
c.       AzadirachtaIndica Azadirachtaindica
d.      Tigris Panthera Pantheratigris
  1. How are pteridophytes different from phanerogams? (NCERT)
Pteridophytes Phanerogams
1.      They have incomplete inconspicuous or less differentiated reproductive organs. They have well developed reproducing organs.
2.      They have naked embryos called spores. They produce seeds.
3.      E.g. Ferns, Equisetum, Marsileaetc. E.g. Pinus, Cycas etc.
  1. How are angiosperms different from gymnosperms? (NCERT)
Angiosperms Gymnosperms
1.      They are flowering plants They are non-flowering plants.
2.      In these, seeds are enclosed inside fruits. In these, naked seeds are not enclosed inside fruits
3.      E.g. Coconut, mango etc. E.g. Pinus, Fir, Cedar etc.
  1. What are the characteristics features of the phylum Fungi? Give examples also.

Characteristics feature of phylum Fungi:

  • Most of the fungi are unicellular. Many of them have the capacity to become multicellular at a certain stage of life.
  • The cell has well-defined nucleus and organelles.
  • The body of fungi is made of thread-like structures called hyphae. The hyphae grow in the form of a mat-like structure called mycelium.
  • The cell wall is generally composed of chitin (a nitrogen-containing carbohydrate).
  • They are heterotrophic. They may be saprophytic (depend on dead or decaying organic matter for their food) or maybe parasitic (depend on living organisms for their food).
  • An example includes Yeast, Asparagus, Mushroom (Agaricus), Rhizopus(Bread Mould), Penicillium.

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