Diversity in Living Organisms Class 9 Worksheet Science

Q.1. Unicellular, Prokaryotic organisms belong to which of the following Kingdom?
(a) Monera
(b) Protista
(c) Fungi
(d) None of these

Correct Answer is Option (a)

Q.2. The branch of Biology dealing with classification is known as–
(a) Ecology
(b) Mycology
(c) Taxonomy
(d) Physiology

Correct Answer is Option (c)

Q.3. Which phylum contains the greatest number of species of animals?
(a) Porifera
(b) Nematoda
(c) Coelenterata
(d) Arthropoda

Correct Answer is Option (d)

Q.4. Which of the following structures are characteristics of Pisces but not of Aves?
(a) Gills
(b) Fins
(c) Scales
(d) All of these

Correct Answer is Option (d)

Q.5. Which of the following is a cryptogam?
(a) Gymnosperms
(b) Angiosperms
(c) Pteridophyta
(d) All of these

Correct Answer is Option (c)

Q.6. What is the difference notochord and nerve card?

Notochord is a solid stiff but flexible rod like structure gives vertebral column in higher chordates (animals) while nerve cord is a solid or hollow tube like structure gives brain and spinal cord (nervous system)

Q.7. Give difference between bony and cartilaginous fishes.

In bony fishes skeleton is bony (made up of bones) while in cartilaginous fishes skeleton is made up of cartilage.

Q.8. What is Binomial nomenclature? Who proposed it?

It is the naming system in which the name of the organism has two words first word is the name of ‘genus’ and second word is the name of ‘species’ of the organism. It was proposed by Carl Von Linnaeus.

Q.9. How pteridophytes different from phanerogams?

Pteridophyta has hidden reproductive organs. External flower or seeds are absent. In phanerogams, well developed reproductive organs which produce seeds are present.

Q.10. How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?

Animals are classified into subgroups on the basis of their level of body organization (cellular, tissue, organ grade) and symmetry, body cavity and presence or absence of notochord etc.

Q.11. Will advanced organisms be the same as complex organisms? Why?

Yes we can say that the advanced organisms are the same as complex organisms because advancement has occurred due to the process of evolution where a group of simple organisms have changed themselves into the complex forms of life for better survival.

Q.12. Why do we classify organisms?

A large number of organisms exist on this earth. We cannot study such enormous biodiversity one by one i.e. studying variety of life forms individually is an impossible task. Hence, we make groups or categories of organisms depending upon their similarities and dissimilarities with other organisms. This allows an easier and systematic study of the life forms.

Q.13. What is classification? What is the need of classification? What is the basis of classification?

Classification – The process of grouping similar things into groups or categories on the basis of similarities and differences is called classification. Need of classification – It is very difficult to study large number of organisms individually. So organism having similar characters grouped together and the studied easily. Classification – Cell structure, mode & source for the nutrition and body organization.

Q.14. How would you choose between two characteristics to be used for developing a hierarchy in classification?

We would choose the characteristic related to their structure and function that will help developing a hierarchy from one level to the next level. Like arthropods are organisms with jointed appendages but among arthropods insects and spiders make to separate groups having peculiar characteristics to define them. Hence we can make the hierarchy in classification by selecting general to specific characteristics.

Q.15. What are the advantages of classifying organisms?

Because of the huge biodiversity i.e. variety of life forms existing on earth it becomes very difficult to study them individually so scientists have made groups of organisms based on their similarities and dissimilarities. Such catergorisation of organisms is known as classification which help us to study them easily and systematically.