Samacheer Kalvi 7th Science Term 2 Unit 5 Book Back Questions and Answers:

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Science – Term 2

Unit 5 – Basis of Classification

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

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

3. The largest division of the living world is
(a) Order
(b) Kingdom
(c) Phylum
(d) Family
Answer: (b) Kingdom

4. Who proposed the five kingdoms of classification?
(a) Aristotle
(b) Linnaeus
(c) Whitaker
(d) Plato
Answer: (c) Whitaker

5. The binomial name of the pigeon is
(a) Homo sapiens
(b) Rattus rattus
(c) Mangifera indica
(d) Columbo livia
Answer: (d) Columbo livia

II. Fill in the blanks:

1. ________ in 1623, introduced the binomial nomenclature.
2. Species is the ________unit of classification.
3.  ________ are non-green and non-photosynthetic in nature.
4. The binomial name of onion is ________
5. Carolus Linnaeus is known as the Father of ________

Answer:

1. Gaspard Bauhin
2. Basic
3. Fungi
4. Hum sativum
5. Modern Taxonomy

IV. Match the following:

Question 1.

1. Monera – Moulds
2. Protista – Bacteria
3. Fungi – Neem
4. Plantae – Butterfly
5. Animalia – Euglena

Answer:

1. Monera – Bacteria
2. Protista – Euglena
3. Fungi – Moulds
4. Plantae – Neem
5. Animalia – Butterfly

V. Assertion and Reason Questions:

1. Assertion (A): Binomial name is the universal name and contains two names.
Reason (R): It was first introduced by Carolus Linnaeus.
(a) Assertion is correct, Reasoning is correct
(b) Assertion is correct, Reasoning is incorrect
(c) Assertion is incorrect, Reasoning is correct
(d) Assertion and Reasoning are incorrect
Answer: (b) Assertion is correct, Reasoning is incorrect

2. Assertion (A): Identification, assortment, and grouping are essential for classification.
Reason (R): These are the basic steps of taxonomy.
(a) Assertion is correct, Reasoning is correct
(b) Assertion is correct, Reasoning is incorrect
(c) Assertion is incorrect, Reasoning is correct
(d) Assertion & Reasoning is incorrect.
Answer: (a) Assertion is correct, Reasoning is correct

VI. Give a 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’ classifications.
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 a 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:
Binomial name
(a) Human being – Homo sapiens
(b) Paddy – Oryza sativa

7. Write two features of Protista.
Answer:

1. It includes unicellular and a few simple multicellular eukaryotes.
2. It includes plant-like protists (Algae) and animal-like protists (protozoans)

VII. Give a 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

1. They are multicellular eukaryotes that can photosynthesize.
2. The cells have cell wall.
3. The cells can perform specialized functions like photosynthesis.
4. Eg. Ferns, cone-bearing plants, and flowering plants

Kingdom Animalia

1. They are multicellular, eukaryotic, and heterotrophic animals.
2. The cells lack cell wall.
3. They cannot photosynthesize but animals move from place to place, unlike plants.
4. Eg. Invertebrates and Vertebrates

3. Write any two merits of the Five Kingdom classification.
Answer:

1. This system of classification is more scientific and natural.
2. This system of classification clearly indicates the cellular organization, mode of nutrition, and characteristics of the early evolution of life.

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