Extra Questions for Class 9th: Ch 7 Diversity in Living Organisms (Science) Important Questions Answer Included

Very Short Answer Questions (VSAQs): 1 Mark

Q1. Scientist who classified animals, according to whether they lived on land, in water or in air?
Greek thinker Aristotle classified animals, according to whether they lived on land, in water or in air.

Q2. What is the lowermost category in the hierarchy of classification of groups of organisms?

Q3. In the hierarchy of classification, which group will have - the smallest number of organisms with a maximum number of characteristics and the largest number of organism?
Smallest number of organisms – Kingdom.
Largest number of organisms – Species.

Q4. Name the kingdom in which an organism does not have a well-defined nucleus and organelles.

Q5. In which kingdom would you place an organism which is unicellular, eukaryotic and photosynthetic?

Short Answer Questions-I (SAQs-I) : 2 Marks

Q1. Mention any two advantages of classifying organisms.
Why do we classify organisms?


(i) Classification makes the study of vast diverse of organisms easier by clubbing them into different groups.
(ii) It also facilitates the study of evolution that has taken place.

Q2. Which organisms are called primitive?


Primitive: Groups of organisms with simpler body structure and ancient body design that have not changed much over a period of time or with evolution e.g., amoeba.

Q3. How primitive organisms are they different from the advanced organisms?


Advanced Groups of organisms with complex body structure and design, that have changed over evolutionary time. e.g., Starfish. Amoeba has a simple body structure and primitive features to that of starfish. Hence, an amoeba is considered more primitive than starfish.

Q4. Name the first four categories used in hierarchical classification of organisms.


(i) Kingdom
(ii) Phylum/ Division
(iii) Class
(iv) Order

Q5. What is symbiotic relationship?


Some fungal species live in a permanent mutually dependent relationship with blue-green algae/Cyanobacteria. Such relationships are called symbiotic relationship.

Short Answer Questions-II (SAQs-II) : 3 Marks

Q1. What is the system of scientific naming of organisms called? State two important conventions followed while giving such names.


The system of scientific naming of organisms is called binomial nomenclature. Each name consists of two parts, generic name and specific name. Generic name should start in capitals and specific name in small letters. When printed, the specific name is given in italics, when handwritten, generic name and specific name must be underlined separately.

Q2. On the basis of presence or absence of coelom organisms are of two types. Is it true or false?


False. On the basis of presence or absence of coelom organisms are of three types. They are:
(i) Acoelomates
(ii) Coelomates
(iii) Pseudo coelomate

Q3. Carolus Linnaeus gave the two kingdom classification. Later it was changed by Ernst Haeckel in 1894 and in 1959, Whittakar gave the five-kingdom classification. Do you think that studying about the work done by earlier scientists or their obsolete theories is useful for students of this generation? Give any three reasons.


It helps us in:
(i) Learning the importance of observation.
(ii) Learning to value the efforts put in by the other scientists/people in general.
(iii) Developing scientific attitude/critical thinking.

Q4. Write four characteristics of monerans.


(i) They are unicellular.
(ii) Prokaryotic in nature.
(iii) Membrane bound cell organelles are absent.
(iv) The mode of nutrition is autotrophic.

Q5. Bluegreen algae have been included under the kingdom monera not under plantae. Why?


Plantae show definite membrane-bound organelles and multi-cellular body design. Blue-green algae is prokaryotic in nature as it does not show multicellular body design. Hence it is included in monera.

Long Answer Questions (LAQs) : 5 Marks

Q1. (a) State two basis of classifying plants and animals into different categories.
(b) List three characteristic features of fungi. Some fungal species live in permanent, mutually dependent relationships with cyanobacteria. What is this relationship called? Where are they found?


(a) (i) On the basis of cell structure.
(ii) On the basis of body organisation.

(b) Fungi are heterotrophic eukaryotic, saprophytes. Permanent mutually dependent relationships are called symbiotic relationships. They are found as slow, growing large, coloured patches on the bark of trees.

Q2. In vertebrata notochord is replaced by…..? State all features possess by vertebrata.


In vertebrata notochord is replaced by a true vertebral column. These animals have a true vertebral column and internal skeleton. All chordates possess the following features:
(i) Bilaterally symmetrical.
(ii) Have a notochord.
(iii) Have a dorsal nerve cord.
(iv) Are triploblastic, have paired gill pouches.
(v) Complex differentiation of body tissues and organs : paired gill pouches and 2, 3, 4 chambered heart
(vi) Are coelomate and segmented
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