Samacheer Kalvi 7th Science Term 2 Solutions Chapter 5 Pdf

Samacheer Kalvi 7th Science Term 2 Solutions Chapter 5 Pdf

Tamilnadu Board Samacheer Kalvi 7th Science Term 2 Solutions Chapter 5: Tamilnadu State Board Solution Class 7 Science Term 2 Chapter 5 – Basis of Classification.

Samacheer Kalvi 7th Science Term 2 Solutions Chapter 5: Overview

Board

Samacheer Kalvi
Class

7

Subject

Science
Chapter

5

Chapter Name

Basis of Classification

Samacheer Kalvi 7th Science Term 2 Solutions Chapter 5 Pdf

I.) Choose the correct answer.

1.) The following characteristics are essential for classification.

(a) Similarities

(b) Differences

(c) Both of them

(d) None of them

Answer: (c) Both of them

Solution: Both of them characteristics are essential for classification.

2.) Approximately ____ species of living organisms found in the earth.

(a) 8.7 million

(b) 8.6 million

(c) 8.5 million

(d) 8.8 million

Answer: (a) 8.7 million

Solution : Approximately 8.7 million species of living organisms found in the earth.

3.) The largest division of the living world is ____

(a) Order

(b) Kingdom

(c) Phylum

(d) Family

Answer: (b) Kingdom

Solution: The largest division of the living world is Kingdom

4.) Who proposed the five kingdom of classification?

(a) Aristotle

(b) Linnaeus

(c) Whittakar

(d) Plato

Answer: (c) Whittakar

Solution: Whittakar proposed the five kingdom of classification.

5.) The binomial name of pigeon is ___

(a) Homo sapiens

(b) Rattus rattus

(c) Mangifera indica

(d) Columbo livia

Answer: (d) Columbo livia

Solution: The binomial name of pigeon is Columbo livia.

II.) Fill in the blanks.

1.) _Gaspard Bauhin______ in 1623, introduced the binomial nomenclature.

2.) Species is the _basic __unit of classification.

3.) _Fungi_ are non- green and non-photosynthetic in nature.

4.) The binomial name of onion is_Allium sativum ___.

5.) Carolus Linnaeus is known as the Father of_modern taxonomy__.

III.) True (or) False. If false write the correct answer.

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

Answer: TRUE

2.) Fishes are aquatic vertebrates.

Answer: TRUE

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

Answer: FALSE

Correct Statement : In the year 1969, Five kingdom classification was proposed.

4.) True nucleus is seen in prokaryotic cell.

Answer: FALSE

Correct Statement : True nucleus is seen in eukaryotic cell.

5.) Animal cells have cell wall.

Answer: FALSE

Correct Statement : Plants cells have cell wall.

IV.) Match the following

Answer:

1.) Monera – Bacteria

2.) Protista – Euglena

3.) Fungi – Moulds

4.) Plantae – Neem

5.) Animalia – Butter fly

V.) Assertion and Reason Questions

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

Reason : It was first introduced by Carolus Linnaeus

Answer: b. Assertion is correct, Reasoning is incorrect

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

Reason : These are basic steps of taxonomy

 Answer: a. Assertion is correct, Reasoning is correct

VI.) Give very short answer

1.) What is classification?

Answer: The method of arranging the organisms into groups is called classification.

2.) List out the five kingdoms classification

Answer:

1.) Monera

2.) Protista

3.) Fungi

4.) Plantae

5.) Animalia

3.) Define – dichotomous key

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

4.) Write two examples of Monera.

Answer: Bacteria and Blue green algae.

5.) What is binomial nomenclature?

Answer: 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 b) Paddy

Answer: (a) Human being – Homo sapiens

(b) Paddy – Oryza sativa

 

7.) Write two features of protista.

Answer: 1) It includes unicellular and few simple multicellular eukaryotes.

2) It includes plant like protists (Algae) and animal like protists (protozoans).

VII.) Give short answer

1.) Write the levels of classification.

Answer: 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.

Answer:

Kingdom plantae Kingdom Animalia
1.They are multicellular eukaryotes that can photosynthesis 1. They are multicellular, eukaryotic and heterotrophic animals.
2. The cells have cell wall. 2. The cells lack cell wall.
3. The cells can perform specialised functions like photosynthesis. 3.They cannot photosynthesize but animals move from place to place unlike plants.
4. Eg. Ferns, cone bearing plants and flowering plants 4. Eg. Invertebrates and Vertebrates

 

3.) Write any two merits of Five Kingdom classification.

Answer: (i) This system of classification is more scientific and natural.

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

 

VIII.) Give answer in Detail

1.) Explain about five kingdom classification

Answer:  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.

  Characteristics Monera Protista Fungi Plantae Animalia
1. Cell type Unicellular  Prokaryotic Unicellular Eukaryotic Multicellular, Non green and Eukaryotic Multicellular , Eukaryotic Multicellular , Eukaryotic
2. Nucleus Absent Present Present Present Present
3. Body Organisation Cellular level Cellular level Multi cellular with loose tissue Tissue level and organ level Tissue ,organ and organ system
4. Mode of Nutrition Auto [or]herterotrophic Auto [or]herterotrophic Saprophytic, parasitic sometime symbiotic Autotrophic Heterotrophic
5. Example Bacteria and Blue green algae Spirogyra and Chlamydomonas Rhizopus and Agaricus Herb ,Shrub and trees Fish, frog birds and human being

 

2.) Write short notes on – Binomial Nomenclature.

Answer: (i) Gaspard Bauhin in 1623, introduced naming of organisms with two names which is known as Binomial nomenclature, and it was implemented by Carolus Linnaeas in 1753.

(ii) Binomial nomenclature 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.

(iii) 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.

(iv) Vernacular name is a local name that is familiar for a particular place. Binomial name is an universal name which never changes.

(v) 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.

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

1.) Phylum Protozoa :- Microscopic unicellular, pseudopodia, flagella and cilia for locomotion, reproduce by fission or conjugation. Eg. Amoeba, Euglena p

2.) Phylum Porifera :- Multicellular organisms with holes in the body. Skeleton formed of spicules, asexual and sexual reproduction.Eg. Leucosolenia,, Sycon.

3.) Phylum Coelenterata:- Multicellular organisms Diploblastic, sessile or free swimming, solitary or colonial, asexual and sexual reproduction. Eg. Hydra, Jelly fish.

4.) Phylum Platyhelminthes:-  Acoelomates, parasites inside the body of animals and human beings, mostly hermaphrodite (bisexual). Eg. Planaria, Liver fuke

5.) Phylum Aschelminthes or Nematoda :- Unsegmented body, mostly parasites in human beings and animals, causing diseases, asexual reproduction.Eg. Ascaris lumbricoides

6.) Phylum Annelida :- Triploblastic, segmented body, mostly hermaphrodite (bisexual and unisexual). Eg. Earthworm, Leech.

7.) Phylum Arthropoda :- Segmented body, thick chitinous cuticle forming an exoskeleton, paired and jointed legs, unisexual exhibits sexual dimorphism. Eg. Crab, Prawn.

8.) Phylum Mollusca :- Soft bodied, unsegmented, muscular head, foot and visceral mass, mantle, a calcareous shell, sexual reproduction. Eg. Cuttle fish, Snail.

9.) Phylum Echinodermata :- Exclusively marine, spines and spicules over the body, water vascular system, tube feet, for feeding, respiration and locomotion sexual reproduction. Eg. Starfsh, Sea – Urchin.

IX.) HOTS

Which kingdom has saprophytic, parasitic and symbiotic nutrition. Why?

Answer: Kingdom Fungi comprises of unicellular to multicellular organisms which are heterotrophic in their mode of nutrition. They do not contain chlorophyll and cannot photosynthesize. Hence they show modes of Nutrition such as:

(i) Saprophytic – Obtaining nutrition from dead matter. Eg. Mucor.

(ii) Parasitic – Obtaining nutrition from living organisms. Eg. Cercospora.

(iii)Symbiotic – Obtaining nutrition through a mutually beneficial relationship with another organism. Eg. Lichens.

 

X.) See the Diagram and write the kingdom :

Pictures of some living organisms are given below. Identify the kingdom to which each of these belong and write the kingdom name in the blanks provided.

 

Answer : a] Kingdom Plantae

b] Kingdom Protista

c]Kingdom Protista

d]Kingdom Animalia

e]Kingdom Fungi

Updated: June 27, 2022 — 2:02 pm

Leave a Reply

Your email address will not be published. Required fields are marked *