NCERT Class 9 Science Solutions: Chapter 7 – Diversity In Living Organisms Part 2

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Question 2:

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

A. It is not always true that an advanced organism will have a complex body structure. But, there is a possibility that over the evolutionary time, complexity in body design will increase. Therefore, at times, advanced organisms can be the same as complex organisms.

Question 1:

Q. What is the criterion for classification of organisms as belonging to kingdom Monera or Protista?

Image showing Kingdom Monera and Protista.

Image Showing Kingdom Monera and Protista

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A. The Criterion for the classification of organisms belonging to kingdom Monera or Protista is the presence or absence of a well-defined nucleus or membrane-bound organelles. Kingdom Monera includes organisms that do not have a well-defined nucleus or membrane-bound organelles and these are known as prokaryotes. Kingdom Protista, on the other hand, includes organisms with a well-defined nucleus and membrane-bound organelles and these organisms are called eukaryotes.

Question 2:

Q. In which kingdom will you place an organism which is single-celled, eukaryotic and photosynthetic?

A. Kingdom Protista includes single celled, eukaryotic, and photosynthetic organisms.

Question 3:

Q. In the hierarchy of classification, which grouping will have the smallest number of organisms with a maximum of characteristics in common and which will have the largest number of organisms?

A. In the hierarchy of classification, a species will have the smallest number of organisms with a maximum of characteristics in common, whereas the kingdom will have the largest number of organisms.

Question 1:

Q. Which division among plants has the simplest organisms?

A. Thallophyta is the division of plants that has the simplest organisms. This group includes plants, which do not contain a well differentiated plant body. Their body is not differentiated into roots, stems, and leaves. They are commonly known as algae.

Question 2:

Q. How are Pteridophytes different from the phanerogams?

A.

Table Contain Shows Different Between Pteridophyta and Phanerogams for Diversity In Living Organisms

Pteridophyta

Phanerogams

They have inconspicuous or less differentiated reproductive organs.

They have well developed reproductive organs.

They produce naked embryos called spores.

They produce seeds.

Ferns, Marsilea, Equisetum, etc. are examples of Pteridophyta.

Pinus, Cycas, fir, etc. are example of phanerogams.

Question 3:

Q. How do gymnosperms and angiosperms differ from each other?

A.

Table Contain Shows Different Between Gymnosperm and Angiosperm for Diversity In Living Organisms

Gymnosperm

Angiosperm

They are non-flowering plants.

They are flowering plants.

Naked seeds not enclosed inside fruits are produced.

Seeds are enclosed inside fruits.

Pinus, Cedar, fir, Cycas, etc. are some example of gymnosperms.

Coconut, palm, mango, etc. are some examples of angiosperms.

Question 1:

Q. How do poriferan animals differ from coelenterate animals?

A.

Table Contain Shows Different Between Porifera and Coelenterate for Diversity In Living Organisms

Porifera

Coelenterate

They are mostly marine, non-motile, and found attached to rocks.

They are exclusively marine animals that either live in colonies of have a solitary life-span.

They show cellular level of Organisation.

The show tissue level of Organisation.

Spongilla, Euplectella, etc. are poriferans.

Hydra, sea anemone, corals, etc. are coelenterates.

Question 2:

Q. How do annelid animals differ from arthropods?

A.

Table Contain Shows Different Between Annelids and Arthropods for Diversity In Living Organisms

Annelids

Arthropods

The circulatory system of annelids is closed.

Arthropods have an open circulatory system.

The body is divided into several identical segments.

The body is divided into few specialized segments.