{"id":4966,"date":"2023-03-22T12:34:35","date_gmt":"2023-03-22T12:34:35","guid":{"rendered":"https:\/\/theexampillar.com\/ncert\/?p=4966"},"modified":"2023-03-28T06:15:33","modified_gmt":"2023-03-28T06:15:33","slug":"ncert-solutions-class-9-science-chapter-7-diversity-in-living-organisms","status":"publish","type":"post","link":"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-9-science-chapter-7-diversity-in-living-organisms\/","title":{"rendered":"NCERT Solutions Class 9 Science Chapter 7 Diversity in Living Organisms"},"content":{"rendered":"

NCERT Solutions Class 9 Science\u00a0<\/span><\/h2>\n

The NCERT Solutions in English Language for Class 9 Science Chapter – 7 (Diversity in Living Organisms) <\/strong>has been provided here to help the students in solving the questions from this exercise.<\/span><\/p>\n

Chapter – 7 (Diversity in Living Organisms)<\/span><\/h2>\n

Questions\u00a0<\/strong><\/span><\/p>\n

1. Why do we classify organisms?
\n<\/strong>Answer –\u00a0<\/strong>There are millions of organisms on this earth. So, it is harder to study them one by one.\u00a0Therefore, we look for similarities among them and classify them into different classes to study these different classes as a whole.\u00a0Classification makes our study easier.<\/span><\/p>\n

2. Give three examples of the range of variations that you see in life forms around you.
\n<\/strong>Answer –\u00a0<\/strong>Listed below are a few ranges of variations observed in life forms:
\n(a) Small frog to big whale
\n(b) Creeper to the eucalyptus tree
\n(c) Black cuckoo to colourful peacock<\/span><\/p>\n

Questions\u00a0<\/strong><\/span><\/p>\n

1. Which of the following do you think is a more basic characteristic for classifying organisms?
\n<\/strong>(a) The place where they live.
\n<\/strong>(b) The kind of cells they are made of. Why?
\n<\/strong>Answer – <\/strong>The more basic characteristic for classifying organisms is the kind of cells they are made of because different organisms may share same habitat but may have entirely different form and structure. So, the place where they live cannot be a basis of classification.<\/span><\/p>\n

2. What is the primary characteristic on which the broad division of organisms is made?
\n<\/strong>Answer –\u00a0<\/strong>The primary characteristic on which the first division of organisms is made is the nature of the cell \u2013 prokaryotic or eukaryotic cell.<\/span><\/p>\n

3. On what basis are plants and animals put into different categories?
\n<\/strong>Answer – <\/strong>Plants and animals put into different categories on the basis of:<\/span>
\n(i) Mode of nutrition: Plants can synthesise their own food, i.e., they are autotrophic while animals are heterotropic.
\n<\/span>(ii) Movement: Plants are static, i.e., they can not move while animals can move.
\n<\/span>(iii) Cell wall: Plants have cell wall made up of cellulose while animals do not have cell wall.<\/span><\/span><\/p>\n

Questions<\/strong><\/span>
\n<\/span><\/p>\n

1. Which organisms are called primitive, and how are they different from the so-called advanced organisms?
\n<\/strong>Answer –\u00a0<\/strong>Organisms with simple cellular stracture and no division of labour are called primitive. Advanced organisms, like mammals have millions of cells and there are system for different biological functions.<\/span><\/p>\n

2. Will advanced organisms be the same as complex organisms? Why?
\n<\/strong>Answer –\u00a0<\/strong>Yes, complex organisms are the same as advanced organisms. The consequence of advancement leads to multiple cell arrangements that operate uniquely.<\/span><\/p>\n

Questions<\/span>
\n<\/strong><\/span><\/p>\n

1. What is the criterion for the classification of organisms as belonging to the kingdom Monera or Protista?
\n<\/strong>Answer –\u00a0<\/strong>It is the presence or absence of a well defined nucleus. Monera has no nuclear membrane, while Protista shows well defined nucleus.<\/span><\/p>\n

2. In which kingdom will you place an organism which is single-celled, eukaryotic and photosynthetic?
\n<\/strong>Answer –\u00a0<\/strong>Kingdom Protista includes single celled, eukaryotic, and photosynthetic organisms.<\/span><\/p>\n

3. In the hierarchy of classification, which grouping will have the smallest number of organisms with maximum common characteristics and which will have the largest number of organisms?
\n<\/strong>Answer –\u00a0<\/strong>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.<\/span><\/p>\n

Questions<\/strong><\/span><\/p>\n

1. Which division among plants has the simplest organisms?
\n<\/strong>Answer –\u00a0<\/strong>Algae or Thallophyta has the simplest organism among plants.<\/span><\/p>\n

2. How are pteridophytes different from phanerogams?
\n<\/strong>Answer –\u00a0<\/strong>The following are the differences between pteridophytes and phanerogams:<\/span><\/p>\n

\n\n\n\n\n\n
Pteridophytes<\/strong><\/span><\/td>\nPhanerogams<\/strong><\/span><\/td>\n<\/tr>\n
They possess a naked embryo<\/span><\/td>\nThey possess a covered embryo<\/span><\/td>\n<\/tr>\n
Exhibit unclear reproductive organ<\/span><\/td>\nExhibit well-defined reproductive organ<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

3. How do gymnosperms and angiosperms differ from each other?
\n<\/strong>Answer –\u00a0<\/strong>
\n<\/span><\/p>\n\n\n\n\n\n\n
\n
Gymnosperm<\/b><\/span><\/div>\n<\/td>\n
\n
Angiosperm<\/b><\/span><\/div>\n<\/td>\n<\/tr>\n
They are non-flowering plants.<\/span><\/td>\nThey are flowering plants.<\/span><\/td>\n<\/tr>\n
Naked seeds not enclosed inside fruits are produced.<\/span><\/td>\nSeeds are enclosed inside fruits.<\/span><\/td>\n<\/tr>\n
Pinus,<\/i>\u00a0Cedar, fir,\u00a0Cycas,<\/i>\u00a0etc. are some examples of gymnosperms.<\/span><\/td>\nCoconut, palm, mango, etc. are some examples of angiosperms.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Questions\u00a0<\/strong><\/span><\/p>\n

1. How do poriferan animals differ from coelenterate animals?
\n<\/strong>Answer –\u00a0<\/strong>Listed below are the differences between poriferan and coelenterate animals:<\/span><\/p>\n

\n\n\n\n\n\n\n
Porifera<\/strong><\/span><\/td>\nCoelenterata<\/strong><\/span><\/td>\n<\/tr>\n
Division of labour is not noticed<\/span><\/td>\nDivision of labour is observed<\/span><\/td>\n<\/tr>\n
The cellular level of the organisation exhibited<\/span><\/td>\nThe tissue level of the organisation exhibited<\/span><\/td>\n<\/tr>\n
Coelom absent<\/span><\/td>\nCoelom present<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

2. How do annelid animals differ from arthropods?
\n<\/strong>Answer –\u00a0<\/strong>Listed below are the differences between annelid and arthropods:<\/span><\/p>\n

\n\n\n\n\n\n\n
Annelida<\/strong><\/span><\/td>\nArthropoda<\/strong><\/span><\/td>\n<\/tr>\n
The entire body is segmented into rings<\/span><\/td>\nSegmentation of the body into the head, abdomen and the thorax region<\/span><\/td>\n<\/tr>\n
Skeleton is absent<\/span><\/td>\nPresence of exoskeleton<\/span><\/td>\n<\/tr>\n
Hermaphrodites<\/span><\/td>\nPresence of different sexes, bisexuals present<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

3. What are the differences between amphibians and reptiles?
\n<\/strong>Answer –\u00a0<\/strong>Listed below are the differences between amphibians and reptiles:<\/span><\/p>\n

\n\n\n\n\n\n\n\n\n
Amphibia<\/strong><\/span><\/td>\nReptilia<\/strong><\/span><\/td>\n<\/tr>\n
Skin is moist and soft<\/span><\/td>\nSkin is hardened<\/span><\/td>\n<\/tr>\n
In water, they breathe through their skin<\/span><\/td>\nThey can exist in water. They come to land to intake oxygen<\/span><\/td>\n<\/tr>\n
Respire through lungs or gills<\/span><\/td>\nRespire through lungs<\/span><\/td>\n<\/tr>\n
Capable of jumping<\/span><\/td>\nThey crawl<\/span><\/td>\n<\/tr>\n
Indirect development is noticed<\/span><\/td>\nDirect development observed<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

4. What are the differences between animals belonging to the Aves group and those in the mammalian group?
\n<\/strong>Answer –\u00a0<\/strong>Listed below are the differences between animals belonging to the Aves group and the mammalian group:<\/span><\/p>\n

\n\n\n\n\n\n\n\n\n\n
Aves<\/strong><\/span><\/td>\nMammalia<\/strong><\/span><\/td>\n<\/tr>\n
Body is covered with feathers<\/span><\/td>\nBody is covered with hairs<\/span><\/td>\n<\/tr>\n
Teeth absent<\/span><\/td>\nTeeth present<\/span><\/td>\n<\/tr>\n
They possess a beak<\/span><\/td>\nBeak absent<\/span><\/td>\n<\/tr>\n
Forelimbs are present and modified to take a flight<\/span><\/td>\nForelimbs are present and used for multiple activities<\/span><\/td>\n<\/tr>\n
Bones are hollow<\/span><\/td>\nBones are solid<\/span><\/td>\n<\/tr>\n
Body is streamlined<\/span><\/td>\nStreamlining of the body is not observed (except for whales)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Exercises<\/strong><\/span><\/p>\n

1. What are the advantages of classifying organisms?
\n<\/strong>Answer –\u00a0<\/strong>Following are the advantages of classifying organisms:<\/span><\/p>\n