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NCERT Exemplar Class 11 Biology Solutions Chapter 1 The Living World: The Living World Chapter makes the students meet with the vast variety of living things and the necessity for scientific classification. With millions of species surrounding us, it is important to know their names, features, habitats, and structural variations. It also addresses significant taxonomical tools such as herbaria, botanical gardens, zoological parks, and museums that facilitate the identification and maintenance of species.
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The chapter further delves into the distinguishing characteristics of living organisms such as growth, reproduction, metabolism, and cellular organization and deals with exceptions such as viruses, which exhibit both living and non-living attributes. NCERT Exemplar Chapter 1 also talks about other important basic factors in biology. All in all, this chapter provides a basis for understanding biodiversity, taxonomy, and the scientific classification of organisms. Also, check NCERT Solutions for Class 11 Biology other chapters.
Question:1
As we go from species to kingdom in a taxonomic hierarchy, the number of common characteristics
a. Will decrease
b. Will increase
c. Remain the same
d. May increase or decrease
Answer: The answer is option a). Will decrease
Question:2
Which of the following ‘suffixes’ used for units of classification in plants indicates a taxonomic category of ‘family.’
a) -Ales
b) -Onae
c) -Aceae
d) -Ae
Answer:
An answer is an option (c) Aceae.
Explanation: The examples of the ‘family’ names like Fabaceae, Solanaceae, etc. have the suffix -aceae in their names.
Question:3
The term ‘systematics’ refers to:
a) Identification and study of organ systems
b) Identification and preservation of plants and animals
c) Diversity of kinds of organisms and their relationship
d) Study of habitats of organisms and their classification
Answer:
The answer is option (c) Diversity of kinds of organisms and their relationship.
Explanation: As the number of organisms that exist on this planet is huge, it was necessary to classify them on the basis of similar characteristics so that they can be divided into groups and sub-groups on the basis of their relationship. This has been done for the ease of understanding the diversity of the organisms.
Question:4
Genus represents
a) An individual plant or animal
b) A collection of plants and animals
c) Group of closely related species of plants and animals
d) None of these
Answer:
The answer is option (c) Group of closely related species of plants and animals.
Explanation: Consider that the taxon species comes under the taxon genus.
Question:5
The taxonomic unit ‘Phylum’ in the classification of animals is equivalent to which hierarchical level in the classification of plants
a) Class
b) Order
c) Division
d) Family
Answer: The answer is option (c) Division.
Explanation: As in the case of the animal kingdom, phylum comes after kingdom an in the plant kingdom, division comes after kingdom, so division is the equivalent hierarchical of phylum in the classification of the plants.
Question:6
Botanical gardens and zoological parks have
Collection of endemic living species only
Collection of exotic living species only
Collection of endemic and exotic living species
Collection of only local plants and animals
Answer:
The answer is option (c) collection of endemic and exotic living species
Explanation: You will have to either visit a botanical garden or zoological park yourself or look up on the internet to find that they have a collection of endemic and exotic living species. For example, tiger and lions are found in the zoological parks, which are the examples of endemic species, whereas giraffe is an example of an exotic species that is found in the zoological parks.
Question:7
Monographs
Flora
Both (a) and (b)
None of these
Answer:
The answer is option (c) Both (a) and (b).
Question:8
All living organisms are linked to one another because
They have the common genetic material of the same type
They share common genetic material but to varying degrees
All have a common cellular organization
All of the above
Answer:
The answer is option (b) They share common genetic material but to varying degrees.
Explanation: The entire theory of evolution is based on the fact that all organisms have had the same ancestors and have common genetic material. The variations that came in the genetic material with evolution have created a diversity of the organisms that we observe around us.
Question:9
Which of the following is a defining characteristic of living organisms?
Growth
Ability to make sound
Reproduction
Response to external stimuli
Answer:
The answer is option (d) Response to external stimuli
Explanation: The other character than the response to the stimuli might not be apparent for any time, but the response to the stimuli could be confirmed whenever required and thus can be considered as the defining characteristic of living organisms.
Question:10
Match the following and choose the correct option
A. Family | (i) tuberosum |
B. Kingdom | (ii) Polymoniales |
C. Order | (iii) Solanum |
D. Species | (iv) Plantae |
E. Genus | (v) Solanaceae |
Options
(i)-D, (ii)-C, (iii)-E, (iv)-B, (v)-A
(i)-E, (ii)-D, (iii)-B, (iv)-A, (v)-C
(i)-D, (ii)-E, (iii)-B, (iv)-A, (v)-C
(i)-E, (ii)-C, (iii)-B, (iv)-A, (v)-D
Answer:
The answer is option (a) (i)-D, (ii)-C, (iii)-E, (iv)-B, (v)-A
Explanation: The order that is followed for the taxa is Kingdom, Order, Family, Genus and then Species.
The classification for the potato is as follows: -
Species: tuberosum
Genus: Solanum
Family: Solanaceae
Order: Solanales
Kingdom: Plantae
Question:1
Answer:
Botanists, Joseph Dalton Hooker and G. Bentham are known for their contribution to the field of plant taxonomy for their work on the classification of plants based on natural characteristics.
Question:2
Answer:
ICZN is the abbreviation for International Code for Zoological Nomenclature.
Question:3
Couplet in taxonomy means_______.
Answer:
Couplet in taxonomy means contrasting characters.
Question:4
Answer:
A monograph provides the work on the primary research and has the information for the various taxon.
Question:5
Amoeba multiplies by mitotic cell division. Is this phenomenon growth or reproduction? Explain?
Answer:
Amoeba is known to reproduce by mitotic cell division because it divides into two new organisms and thus is it an act of reproduction rather than growth.
Question:6
Answer:
The collection of the biological reactions that occur in living beings together is called metabolism.
Question:7
Which is the largest botanical garden in the world? Name a few well known botanical garden in India.
Answer:
The largest botanical garden in the world is The Royal Botanical Garden in Kew. A few of the known botanical gardens in India are as follows:
Lloyd Botanical Garden, Darjeeling
National Botanical Garden, Lucknow
Indian Botanical Garden, Kolkata
Botanical Garden of FRI, Dehradun
Question:1
Answer:
It is indeed true that a ball of snow when rolled over snow increases in mass, volume, and size because of the accumulation of the snow on the outer surface of the snowball. However, the growth in living organisms occurs due to the internal accumulation of the material that happens in the case of meiosis and mitosis in the cells. The formation of the new cells makes for increased mass and protoplasm in living beings. However, the process of growth in living organisms is certainly different from the snowball.
Question:2
Answer:
The term biodiversity is a broader term that is used to refer to all the kinds of organisms that exist on this planet. If we consider the given example, it only contains a few plant species and animal species in a particular area; thus, it cannot be called biodiversity because it is in a small area and contains only a few species of living organisms. On the other hand, the term diversity is used to refer to the species in a particular area. Thus, for the given example, the term diversity is suitable to refer to the given small ecosystem.
Question:3
Answer:
According to the International Code of Botanical Nomenclature, the units of classifications and their suffixes used by the botanists are given below.
Hierarchy | Suffix used |
Kingdom | - Plantae |
Division | - phyta |
Class | - ae |
Order | - ales |
Family | - eae or -ceae |
Genus | It is the first term of the scientific name of the organism |
Species | It is the second term of the scientific name of the organism |
Question:4
Answer:
The variants that occur due to the morphology are called biotypes. The biotypes have a similar genetic structure, but they have different morphology because abiotic factors like the pH of the soil, temperature, rainfall, etc. change the morphology of the plants. This change is an abiotic factor observed due to the difference in the altitude gradient.
Question:5
Answer:
The herbarium sheet can be prepared by following the given steps: -
Collection: You will need to collect the living beings of a particular species.
Pressing: The collected specimens of the species are kept between two sheets and then pressed hard so as to preserve them.
Drying: In this step, the specimen is kept for drying, which is usually done in the sun.
Poisoning: The specimens need to be injected with the antifungal treatment so that they can be preserved for longer.
Mounting: In this step, the sample of the specimen is kept over the herbarium for mounting.
Labelling: The information about the classification of the specimen is written on the label.
The tools that are necessary and would be required while collecting the specimen of a particular species for the herbarium include digger, sickle, polythene bags, pruning knife, vasculum, old newspaper, blotting paper, herbarium sheets, labels, glue, plant press, field notebooks, etc.
The necessary information that needs to be put on the label while putting it in a herbarium for preservation includes the name of the division that it belongs to, the family, genus and the species of the specimen.
Question:6
Answer:
The term flora is used to refer to the total plant species that are sound in a particular geographical area. The fauna is the total animal species found in that area, and the vegetation is a broader term that is used for a larger area than an ecosystem of a particular area. At times, vegetation is used to refer to the plants’ species that is present all around the globe.
Endemic species: The species of any living beings that are found in a particular geographical area is referred to as the endemic species of that area. For example, Rauvolfia serpentina is an endemic species found in India.
Exotic species: The species that are not naturally found in a particular geographical area but is either present due to careful selection or breeding or has been imported to that area for any reason is referred to as the exotic species. For example, Eichhornia crassipes is not naturally found in India, and thus it is an exotic species in India.
Question:7
Answer:
As it is quite obvious that there are a zillion languages that are spoken all around the world and they further have more dialects, it is possible that the name of a plant species would be different for different languages. This can create a huge problem as the people cannot remember a million names for a single plant, and when it comes to remembering so many names for all the species, it is impossible. Thus, the botanists have come up with a binomial nomenclature so that the naming of all the species is unique and yet same globally. The botanical name of a plant species consists of its genus name and its species name. This ensures that the scientific name of a particular plant species is the same for the ease of research.
Question:8
Answer:
Brinjal and potato are put under the same genus Solanum because they have certain characteristics in common that belong to the species of the genus Solanum like inflorescence, venation, phyllotaxy, etc. Since potatoes and brinjal cannot interbreed, thus they belong to different species. Had they been able to interbreed, they would be put under the same species because the ability to interbreed is an important criterion for the members of the same species.
Question:9
Answer:
Though the function of the cell organelles is different, they are usually made up of similar molecules. The molecules of the cell organelle are arranged in a certain way to form a particular cell organelle. For instance, a brick can be used to make a house or a bigger factory, even though the end products are different, the constituents of the brick remain the same. In a similar manner, the properties of the cell organelles do not depend on the molecular constituents.
Question:10
The number and kinds of organisms is not constant. How do you explain this statement?
Answer:
First talking about the number of organisms, the population of any species of organism is not constant. The population tends to change under the conditions. If the conditions are favourable, then the population grows else the population reduces. Next, the kinds of organisms also do not remain constant because evolution is a never-ending process, and the variations in the species keep happening. The species that can adapt to the changing conditions survive, or else the species become extinct.
Question:1
What is meant by living? Give any four defining features of life forms.
Answer:
An organism is considered to be living if it is capable of evolving, self-replicating, responding to external stimuli, etc. Nutrition, response to stimuli, reproduction, and growth are several aspects of living beings, but they are not the defining features of life forms. Growth is often mistaken to be a defining feature of life forms, but it is not the case as a few non-living things like snowballs, clouds, etc. can also gain mass, volume, and space. So, growth is not a defining feature for living beings.
The four defining features of life forms are: -
Metabolism: The collection of carrying out several biological reactions in the living being comprises of the metabolism. Metabolism includes the breakdown and the formation of various molecules to carry out the biological reactions in living organisms. Since metabolism requires a system comprised of cells to be carried out, it is quite evident that this cannot be done in non-living things. Though a few in-vitro reactions have been tried in the laboratories to imitate metabolism, that is not real metabolism. Thus, metabolism is one of the defining features of life.
Reproduction: Reproductions are carried out by living organisms to produce offspring like them. Reproduction could be either sexual reproduction or asexual reproduction, but the act of producing offspring of your kind is a feature of living organisms alone. Though there are a few living organisms like the worker bee, that do not reproduce, that does not take reproduction down as a defining feature of the life forms because reproduction cannot be carried out in non-living things. Thus, reproduction is a defining feature of life forms.
Response to stimuli: The stimuli can be felt by the organisms either externally in the form of temperature, touch, light, etc. or internally via hormones like dopamine, estrogen, etc. The response to the stimuli is a defining feature for living beings because they can sense a change in their environment whether externally or internally and respond to it most appropriately according to their convenience. This sense of consciousness is absent in non-living beings, and thus, it is a defining feature of the living forms.
Structural organization: The structural organization, whether on a cellular level or at an upper level, is found in living beings. Various molecules come together and arrange themselves in a particular arrangement to form cell organelles, and these cell organelles further arrange themselves in a specific fashion to form cells. These cells come together to form various tissues, and then these tissues further arrange in a way to form various organs present in living beings. These organs are what the body of the living being functions on.
This arrangement from the cellular level up to the organ level is an extremely advanced and complicated manner of structural organization which cannot be made in non-living beings. The arrangement of each cell organelle matters as the different arrangements form different cells; each cell arrangement further makes different tissues, and each arrangement of tissues makes different organs. This level of hierarchy is not possible in non-lining things, and thus the structural organization is a defining feature of living beings.
Question:2
Answer:
The scientist should first start by examining the morphological features of the plant like the type of roots or the venation. If the plant has fibrous roots, then it should belong to the monocotyledons, and if it has a tap root, then it should belong to the dicotyledons. This can also be checked by examining the venation of the plant, whether it is parallel or reticulate. Another way is to count the number of cotyledons present in the seeds of the plant.
After that, the scientist could go ahead with finding out the inflorescence, phyllotaxy, etc. which will help the scientist to find out about the order and the family that the plant belongs to. If the sample plant is a flowering plant, then the scrutinization of the floral parts could give details about the order and the family of the plant. The arrangement of the seed in the fruits can also tell about the type of placentation in the plant sample.
After that, the arrangement of the antheridium and gynoecium should be examined to see if the plant sample belongs to a new species of plant. This research work done by the scientist needs to be verified based on these features so that the new species of the plant can be verified. Also, when it comes to naming a new species of plant, the scientist needs to rule out the similarity of with any other existing plant species so that a unique name can be kept for the discovered plant species.
Question:3
Brassica Campestris linn
Give the common name of the plant
What do the first two parts of the name denote?
Why are they written in italics?
What is the meaning of linn written at the end of the name?
Answer:
a) Mustard is the common name for Brassica Campestris Linn.
b) The first term of the name denotes the genus that the plant belongs to and the second part denotes the family of the plant.
c) The scientific names are written in italics because it is a rule to write the scientific names in italics; and also, in this case, it could also be to represent that they have a Latin origin.
d) The linn written at the end of the name shows that this name was discovered and studied by Linnaeus.
Question:4
Answer:
The tools that are used by scientists to learn about plants and animal species are known as taxonomical tools. The plants and animals species are often preserved by scientists for research purposes. The plant species are stored and preserved in a herbarium, and the animal species are preserved in the museums.
The herbarium is used to preserve and store the plant specimens with their details about classification for future reference. The herbarium is useful and can be used to refer to when people are studying the specimens belonging to the various species of plants. Apart from being a referral system, it is also convenient to maintain a herbarium, and it could also be transported making it easier and more convenient.
The museums, on the other hand, have a huge collection of various plant and animal species, but mostly animal species. The skeletons of various species of animals that have gone extinct could be found in the museums for research and other purposes. The museums are often maintained by the educational institutions as they are important for the students to refer to and learn about their science lessons in real life. They get to experience it all in the museum that helps them learn better.
The role of botanical gardens and zoological parks in conserving biodiversity is immense as these places were created to work towards conserving the degrading biodiversity. The botanical gardens and the zoological parks are the places that provide the most comfortable and safe place to live for the plants and the animals without having to give up on the feeling of living in their natural habitat. The personnel that are appointed to take care of the plants and the animals also carry out selective breeding amongst them to ensure the continuity of various species. The personnel are always there to take care of the plants and the animals and to provide proper treatment and care if they fall sick. This helps in the conservation and betterment of biodiversity. Thus, botanical gardens and zoological parks are important for the conservation of biodiversity.
Question:5
Answer:
A taxon is used to refer to a level of the biological classification such as order, phylum family, etc.
In the taxonomy, the different taxa are assigned their levels, and they follow a certain order that cannot be changed. For example, a species always follows up after a genus, and this order cannot be reversed.
Flow diagrams from the lowest category to the highest category for plants and animals are given below:
Plant: Kingdom → Division → Class → Order → Family → Genus → Species
Animal: Kingdom → Phylum → Class → Order → Family → Genus → Species
As we go up the taxonomical hierarchy, the number of shared characters reduces as the level of classification decreases. For example, the number of shared characters of a species will be more than the number of shared characters for a family.
As we go up the taxonomical hierarchy, the classification decreases and thus, the number of individuals increases.
Question:6
Answer:
The friend would explain to him that a key is used to study the taxonomic categories, and it comprises two contrasting characters. These characters exist in pairs, and these pairs are called couplets. The examination of a key makes it possible to either accept or reject the contrasting characters. The statements in a key are called the leads, and the choice of the contrasting characters is made in a key. The key is analytic, and they are different for each different taxonomic level. The keys are important for the identification of the given organisms. For instance, is an organism has a notochord or not will define whether the organism belongs to invertebrates or sub-phylum Vertebrata. Another example could be the presence of lungs which determines it the organism is from the Tetrapoda group or the Pisces.
Question:7
Answer:
The collection of the biological reactions that occur in living beings is referred to as metabolism. The metabolism requires the presence of the cells to be carried out successfully and cannot be carried out in non-living things that are not composed of cells. Though the scientist is capable of carrying out in-vitro reactions which are similar to the metabolic reactions, in the laboratory, that does not count for real metabolism. They are called living reactions because they are carried outside of the living bodies of the animals, but they are not living beings. Thus, metabolism is considered to be a defining feature of life.
Question:8
Do you consider a person in coma - living or dead?
Answer:
It is difficult to examine whether a person is living or dead, especially when it comes to human beings. The basic definition that is followed to examine if a person is dead or not is the state of the person’s brain. A person is considered to be living in a coma if that person is not brain dead, even if the vital organs of the body have stopped working. These kinds of people are often supported by the life systems to carry out the functions of the organs that have stopped working in their bodies. A heart machine provides continuous blood circulation, and a lung machine keeps the regulation of the air in control. A dialysis machine is set up to remove the waste from the blood regularly to stop the accumulation of the waste in the body and to prevent death. The intravenous fluid is used to provide nutrition to the patient.
The person who is in the coma is not the controller of his consciousness and thus fails to respond to the external stimuli, which is a defining feature for living beings. The person who is in a coma has to take the support of the life system to carry out the metabolic reaction, and thus, that person can be considered dead. But since that person is not brain-dead yet, he is considered to be alive. But as soon as the person is put off the life system, that person will be declared dead by all means. But until then, it is difficult to say whether the person in the coma is dead or alive.
Question:9
Answer:
Whole moong dal | Broken moong dal |
The whole seed of the dal is intact. | The seed of the dal is broken into pieces. |
The seed is able to respire. | The seed is unable to respire. |
The seed can grow and germinate under favourable circumstances. | The seed will not germinate under any circumstances. |
These seeds are considered to be living. | These are considered to be non-living. |
Question:10
Answer:
Not all the properties of the tissues are indeed the constituents of the cells that they are made up of. The following statements show why this is true:
The muscle tissue can contract and relax, but the cells that it is made up of, might not be capable of carrying out such actions.
The bones and the cartilage together form the skeletal system. The bone is hard, and the cartilage is soft. The bone is also lightweight, but the skeletal system has different properties as compared to its constituents.
The WBCs that are one of the constituents of blood does not have the capability of carrying oxygen, whereas the blood carries the oxygen.
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NCERT Exemplar Solutions Class 11 Biology Chapter 1 are most beneficial to those students who are interested in the basics of Biology. To understand it more deeply, students may also look at various taxonomical aids including herbaria, botanical gardens, zoological parks, and museums. Similarly, the Living World is filled with important details on classification systems, diversity of species, and taxonomy principles and their importance while studying organisms systematically.
The chapter also talks about features of living things, including growth, reproduction, metabolism, and cellular organization, with exceptions such as viruses, which have both living and non-living characteristics. Classification is important in understanding biodiversity, and evolutionary relationships, and categorizing life forms in an organized way.
Also, Read NCERT Solution subject-wise
There are millions of living organisms in the world. To study a specific species, it is important to single it out from numerous other organisms. Here's where classification plays an important role.
Class 11 Biology NCERT Exemplar solutions chapter 1 might awaken the interest of students in taxonomy and study of a specific organism when discovered with elaborate research being conducted before placing it any kind of category and those criteria for placing one organism in a particular category is what is studied in detail in this chapter.
Taxonomy is a process of classification considering the internal and external structure of the cell, developmental process and ecological information. In The living World, we will study taxonomic categories that are a level in the hierarchical classification of the organisms.
Must Read NCERT Notes subject-wise
The following extra concepts can be studied from the perspective of the NEET exam:
The biology chapter-wise exemplar solutions of Class 11 are given below:
Class 11 NCERT Exemplar Biology solutions chapter 1 has detailed that Classification of living, Biodiversity, Taxonomic Categories and Taxonomical Aids, and also the salient or defining features of them are important topics which students should pay extra attention to.
It also explores taxonomical aids which have techniques, processes and stored information about various living organisms that makes identification easier.
Herbariums have dried and pressed plant specimens; botanicals have a variety of living plants and flowers, biological museums have specimens stored in preservative solutions, and zoological parks are where different animals are kept for public display.
NCERT Exemplar Class 11 Solutions for Other Subjects
The Living World is a sound basis for the study of biological classification, taxonomy, and biodiversity. It focuses on the need to classify organisms in an orderly manner by employing classification schemes and taxonomic tools. The chapter also teaches binomial nomenclature, which facilitates universal identification of species. It further examines the salient features of living organisms in considering exceptions such as viruses. Students learn a lot about the diversity of life and the scientific principles behind classifying and researching various species, which are necessary for further biological research and studies through this chapter.
The students will get a better idea of the taxonomic divisions, and how the flora and fauna are given scientific names.
The NCERT Exemplar Class 11 Biology solutions chapter 1 of the chapter will help in solving practice-related doubts and will also help in understanding the topics better.
All the questions are solved by our high experienced biology teachers, who have years of experience in teaching and research in biology and related subjects.
The pattern of the Class 11 NCERT Exemplar Biology solutions chapter 1 presented here are in detail with detailed diagrams and charts for a better explanation as per CBSE.
Key topics include biodiversity, the need for classification, taxonomy and systematics, and the principles of binomial nomenclature, as well as taxonomical aids like museums, botanical gardens, and zoological parks.
In biology, classification systems are broadly categorized as artificial, natural, and phylogenetic. Artificial classification relies on superficial characteristics, while natural classification considers multiple natural properties. Phylogenetic classification focuses on evolutionary relationships and genetic links.
The five-kingdom system categorizes living things into five kingdoms: Monera (prokaryotes), Protista (unicellular eukaryotes), Fungi, Plantae, and Animalia, based on cell structure, mode of nutrition, body organization, and phylogenetic relationships. The two-kingdom system, in contrast, only divided organisms into Plantae (plants) and Animalia (animals).
Taxonomy plays a crucial role in classifying organisms by providing a structured system for organizing and understanding the diversity of life on Earth.
Binomial nomenclature is crucial in biological classification because it provides a standardized and universally accepted system for naming organisms, allowing scientists to communicate clearly and avoid confusion caused by common names that can vary regionally or be misleading.
The major taxonomic categories, in order from broadest to most specific, are: Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species.
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