7th Std Science Term 2 Solution in English | Lesson.5 Basis of Classification

Lesson 5. Basis of Classification 

Basis of Classification Book Back Solution

Lesson 5. Basis of Classification

I . Choose the correct answer.

1. The following characteristics are essential for classification

  1. Similarities
  2. Differences
  3. Both of them
  4. None of them

Ans : Both of them

2. Approximately ____________ species of living organisms found in the earth.

  1. 8.7 million
  2. 8.6 million
  3. 8.5 million
  4. 8.8 million

Ans : 8.7 million

3. The largest division of the living world is __________

  1. Order
  2. Kingdom
  3. Phylum
  4. Family

Ans : Kingdom

4. Who proposed the five kingdom of classification?

  1. Aristotle
  2. Linnaeus
  3. Whittakar
  4. Plato

Ans : Whittakar

5. The binomial name of pigeon is _________

  1. Homo sapiens
  2. Rattus rattus
  3. Mangifera indica
  4. Columbo livia

Ans : Columbo livia

II. Fill in the blanks:

1. _____________ in 1623, introduced the binomial nomenclature.

Ans : Gaspard Bauhin 

2. Species is the ________ unit of classification.

Ans : Basic

3. __________ are non – green and non – photosynthetic in nature.

Ans : Fungi

4. The binomial name of onion is _________

Ans : Allium sativum

5. Carolus Linnaeus is known as the Father of _________

Ans : Modern Taxonomy

III. Match the following:

1. Monera Moulds
2. Protista Bacteria
3. Fungi Neem
4. Plantae Butterfly
5. Animalia Euglena
Ans : 1 – B, 2 – E, 3 – A, 4 – C, 5 – D

IV. True or False – If false give the correct answer:

1.  Classification helps to know the origin and evolution of an organism.

Ans : True

2. Fishes are aquatic vertebrates

Ans : True

3. In the year 1979, Five kingdom classification was proposed.

Ans : False.

Cu. An. : In the year 1969, Five kingdom classification was proposed.

4. True nucleus is seen in prokaryotic cell.

Ans : False

Cu. An. : . True nucleus is seen in eukaryotic cell.

5. Animal cells have cell wall

Ans : False

Cu. An. :  Plant cells have cell wall.

V. Assertion and Reason:

  1. Assertion is correct, Reasoning is correct
  2. Assertion is correct, Reasoning is incorrect
  3. Assertion is incorrect Reasoning is correct
  4. Assertion and Reasoning are incorrect

1. Assertion (A) : Binomial name is the universal name and contains two names

Reason (R) : It was first introduced by Carolus Linnaeus

Ans : Assertion is correct, Reasoning is incorrect

2. Assertion (A) : Identification, assortment and grouping are essential for classification

Reason (R) : These are basic steps of taxonomy

Ans : Assertion is correct, Reasoning is correct

VI. Give very short answer:

1. What is classification?

The method of arranging the organisms into groups is called classification

2. List out the five kingdoms classification.

  • Monera
  • Protista
  • Fungi
  • Plantae
  • Animalia

3. Define – dichotomous key.

It is a tool used to classify organisms based on their similarities and differences.

4. Write two examples of Monera.

Bacteria and Blue green algae.

5. What is binomial nomenclature?

Binomial nomenclature is an universal system of naming organisms. As per this system, each organism has two names – the first is the Genus name and the second is the Species name.

6. Write the binomial name of

(a) Human being

  • Homo sapiens

(b) Paddy

  • Oryza sativa

7. Write two features of protista.

  • It includes unicellular and few simple multicellular eukaryotes.
  • It includes plant like protists (Algae) and animal like protists (protozoans)

VII. Give short Answer :

1. Write the levels of classification.

There are seven main categories of hierarchies namely, Kingdom, Phylum, Class, Order, Family, Genus and Species- Species is the basic unit of classification

2. Differentiate plantae and animalia

Kingdom plantae Kingdom Animalia
1. They are multicellular eukaryotes that can photosynthesize. They are multicellular, eukaryotic and heterotrophic animals.
2. The cells have cell wall. The cells lack cell wall.
3. The cells can perform specialised functions like photosynthesis. They cannot photosynthesize but animals move from place to place unlike plants.
Eg. Ferns, cone bearing plants and flowering plants Eg. Invertebrates and Vertebrates

3. Write any two merits of Five Kingdom classification.

This system of classification is more scientific and natural.

This system of classification clearly indicates the cellular organization, mode of nutrition, and characters for early evolution of life.

VII. Give answer in Detail:

1. Explain about five kingdom classification.

The five kingdom classification was proposed by R.H.Whittaker in 1969. He classified the organisms into five kingdoms on the basis of characteristics like cell structure, mode of Nutrition, Source of Nutrition and body organization.

Basis of Classification Book Back Solution 2021 - 2022

2. Write short notes on – Binomial Nomenclature.

  • Gaspard Bauhin jn 1623, introduced naming of organisms with two names which is known as Binomial nomenclature, and it was implemented by Carolus Linnaeas in 1753
  • Binomial nomenclature an universal system of naming organisms. As per this system, each organism has two names – the first is the Genusname and the second is the Speciesname.
  • Genus name begins with a capital letter and Species name begins with a small letter. Example The nomenclature for onion is Allium sativam. Genus name is Allium, species name is sativam.
  • Vernacular name is a local name that is familiar for a particular place. Binomial name is an universal name which never changes.
  • Binomial nomenclature and classification helps scientists to identify any organisms and to place them at a particular hierarchy.

3. Give an account on the classification of invertebrates with few general features and examples.

Invertebrates are animals without a backbone. The invertebrates have been classified into various phyla as follows:

Phylum Protozoa

Eg. Amoeba, Euglena and Paramoeciu

Microscopic unicellular, pseudopodia, flagella and cilia for locomotion, reproduce by fission or conjugation.

Phylum Porifera

Eg. Leucosolenia, Spongilla, Sycon.

Multicellular organisms with holes in the body. Skeleton formed of spicules, asexual and sexual reproduction.

Phylum Coelenterata

Eg. Hydra, Sea anemone, Jelly fish, Corals.

Multicellular organisms Diploblastic, sessile or free swimming, solitary or colonial, asexual and sexual reproduction

Phylum Platyhelminthes

Eg. Planaria, Liver fluke , Blood fluke, Tapeworm

Acoelomates, parasites inside the body of animals and human beings, mostly hermaphrodite (bisexual).

Phylum Aschelminthes or Nematoda

Eg. Ascaris lumbricoides

Unsegmented body, mostly parasites in human beings and animals, causing diseases, asexual reproduction.

Phylum Annelida

Eg. Earthworm, Nereis, Leech.

Triploblastic, segmented body, mostly hermaphrodite (bisexual and unisexual).

Phylum Arthropoda

Eg. Crab, Prawn, Millipede, Insects, Scorpion, Spider

Segmented body, thick chitinous cuticle forming an exoskeleton, paired and jointed legs, unisexual exhibits sexual dimorphism.

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