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NCERT Solutions for Class 9th Science


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Chapter 7. Diversity in Living Organisms

Additional -Questions 2




Additional Questions with solutions:




Que. -  What is called primitive organism?

Ans. – Some groups of organisms which have ancient body designs that have not change very much. Such organisms are called primitive organisms.

Que. – What are called advanced organism?

Ans. – Some groups of organisms which have acquired their particular body designs relatively recently. Such organisms are called advanced organisms.

Que. – Define plants. 

Ans. – Those which synthesize their own food in taking part in photosynthesis process are called plants. 

Que – Define symbiotic?

Ans – Some fungal species live in permanent mutually dependent relationships with bluegreen algae (or cyanobacteria). Such relationships are called symbiotic. Ex. Lichens.

Que - Define Taxonomy. 

Ans: The branch of science that classify living organisms among different categories or group is called taxonomy. It is the science of identifying and naming species into system of classification.

Que – Which type of organisms found in Protista class. Give two example.

Ans – The organisms of unicellular Eukaryotic are found in Protista. Give two example. E x. Ameoba and Paramecium.


Que – What are phanerogams?

Ans – plants with well differentiated reproductive tissues that ultimately make seeds are called phanerogams.

Que – What are cryptogams?

Ans - The reproductive organs of plants in such groups are very inconspicuous, and they have hidden reproductive organs’. Therefore they are called  ‘cryptogamae’.


Que – What is Nomenclature?

Ans - There need for systematic naming of living organisms for identifying them as we can’t identify the organisms by their general name anywhere in the world. This is also known as scientific name. There are two names with Nomenclature, the first genus and second for species.  


Que – What is Notochord?

Ans – The notochord is a long rod-like support structure (chord=string) that runs along the back of the animal separating the nervous tissue from the gut.


Que : There are holes or pores all over the body of the Porifera organisms, What is the function of these holes?

Ans : These holes lead to a canal system that helps in circulating water throughout the body to bring in food and oxygen.


Que – Write the advantage of nomenclature.

Ans – we can’t identify the organisms by their general names anywhere in world. As organisms have different name in different localities. Organisms can be identified by the nomenclature (Scientific name). Nomenclature provides organisms’ scientific name.      



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