Test: The Living World 2 - From Past 28 Years Questions

27 Questions MCQ Test Biology Class 11 | Test: The Living World 2 - From Past 28 Years Questions

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The practical purpose of classification of living organisms is to [1999]


Biological classification is the scientific arrangement of organisms in a hierarchical series of groups and subgroups on the basis of similarities and differences in their traits. It helps in building evolutionary pathways and in identifying new organisms.
The practical purpose of classification of living organisms is to facilitate identification of unknown organisms. It helps in building evolutionary pathways and in identifying new organisms.


A system of classification in which a large number of traits are considered, is



Artificial system of classification is based on comparison of one or a few characters.  A system based upon a large no. of natural characters or traits is natural system of classification, Proposed by de Jussieu. Phylogenetic system of classification indicates the evolutionary or phylogenetic relationship of organisms.


The book Genera Plantarum was written by


Genera Plantarum is a publication of Swedish naturalist Carl Linnaeus (1707–1778). The first edition was issued in Leiden, 1737. The fifth edition served as a complementary volume to Species Plantarum (1753). Article 13 of the International Code of Nomenclature for algae, fungi, and plants states that "Generic names that appear in Linnaeus' Species Plantarum ed. 1 (1753) and ed. 2 (1762–63) are associated with the first subsequent description given under those names in Linnaeus' Genera Plantarum ed. 5 (1754) and ed. 6 (1764)." This defines the starting point for nomenclature of most groups of plants.


The most important feature of all living systems is to



Correct Answer :- b

Explanation : Reproduction is necessary for continuity of life. However, production of gametes is not only method for this . A number of organisms reproduce asexually. In any case, cell division is necessary which involves replication of DNA.


Relative biological effectiveness (RBE) is usually referred to damages caused by 



RBE (Relative Biological Effectiveness) is a comparison of the dose of the radiation being studied with the dose of standard radiation producing the same effect.


Which of the following is less general in characters as compared to genus?



The correct hierarchy of classification of various taxons in descending order is given by:

Kingdom → Phylum → Class → Order → Family → Genus → Species

The kingdom is the highest taxon with the least similar characters shared between its various members while species is the lowest level with almost similar morphological and behavioral similarities. Species is followed by Genus with slightly fewer similarities among its members.

So, the correct answer is 'Species'


What is TRUE for photolithotrophs?



Photolithotrophs manufacture their own organic nutrients from inorganic raw materials  (H2, O2) with the help of radiation energy. 


First life on earth was



Early conditions on earth were high temperature, volcanic eruptions, lightning and reducing atmosphere (because there was no oxygen) , so an organism which can survive in these extreme conditions might have lived at early earth. from given options chemoheterotrophs fit right in the given situations. So, the answer is chemoheterotrophs.


In five kingdom system, the main basis of classification is



-The five kingdom classification is a mode of classification based on the following criteria.     

-Complexity of cell structure  

-Complexity of body structure        

-Modes of nutrition  

-Ecological life styles  

-Phylogenetic relationship


What is TRUE for individuals of same species? 



Individuals of the same species can interbreed. No two individuals share the same ecological niche.


Organisms which obtain energy by the oxidation of reduced inorganic compounds are called



The organisms obtaining energy by chemical reactions independent of light are called chemotrophs. When the reductants obtained from the environment in inorganic form then organisms are chemoautotrophs. While when its is organic then organisms are chemoheterotrophs.
Photoautotroph make their food by photosynthesis using the energy of sun.
Saprozoic organisms obtain food from dead and decaying matter.


Phenetic classification is based on

[2003, 04]


Phenetic classification is based upon observable characteristics of an  organism. Phylogenetic system of classification is a system indicating the evolutionary or phylogenetic relationship of organisms.


Biosystematics aims at



Biosystematics is the study of biological diversity and its origins. It focuses on understanding evolutionary relationships among organisms, species, higher taxa or other biological entities, such as genes and the evolution of the properties of taxa including intrinsic traits, ecological interactions, and geographic distributions. An important part of systematics is the development of methods for various aspects of phylogenetic inference and biological nomenclature. Whereas morphological characteristics ( physical appearance) and cytological characteristics ( size of cell and nucleus) are not used for systematics. Thus, the correct answer "D"


Species are considered as



In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are often used, such as similarity of DNA, morphology or ecological niche. Presence of specific locally adapted traits may further subdivide species into subspecies. 


Plants reproducing by spores such as mosses and  ferns are grouped under the general term [2003]


 The word cryptogam came from the greek word cryptos - hidden: gamos - marriage.Sporophyte is a stage in the life cycle of a plant. In ordinary conditions it always diploid. Thallophytes are the group of lower plants which do not have vascular supply, e.g.. Bacteria, algae, fungi etc. Bryophyta is a group of cryptogams which has the amphibious type of adaptation.


Angiosperms have dominated the land flora primarily because of their



Angiosperms have adapted themselves to all kinds of habitat - terrestrial, aquatic, tropical, deciduous and alpine. Self pollination is seen in very few angiosperms.Production of large number of seeds ensure that at least some will germinate. Not all plants have been domesticated by man.


Which of the following is NOT true for a species?



Gene flow is the spread of genes through populations as effected by movements of individual and their propagules, e.g. seeds spores etc. Gene flow ensures that all populations of a given species share a common gene pool. i.e. it reduces  difference between populations. The interruption of gene flow between populations is a pre-requisite for the formation of new species.


ICBN stands for



ICBN (International code of Botanical Nomenclature) - It is one of the code of nomenclature which is independent of zoological and bacteriological nomenclature. The code applies equally to names of taxonomic groups treated as plants whether or not these groups were originally so treated.


Biological organisation starts with



Biological organisms starts with submicroscopic molecular level like viruses, bacteria etc.
These organisms are unable to be seen by naked eyes without the help of microscope or even electron microscope.


Select the CORRECT statement from the following?



To survive in a particular environment, an organism need to adapt in that environment. If the organism becomes success in adapting them that organism is selected by nature .


System of classification used by Linnaeus was 


Linnaeus put forward an “Artificial system” of plant classification which was based on sexual characters. It is commonly  also called as Sexual System of plant classification.


The haemoglobin of a human foetus



The haemoglobin of a human foetus has a higher affinity for oxygen than that of an adult. Haemoglobin is a group of globular proteins occurring widely in animal as oxygen carriers in blood. 


Which one of the following is considered important in the development of seed habit?



Heterospory is considered important in the development of seed habit. Heterospory is 
the production of spores of two different sizes and sexes by the sporophytes of land plants. Heterospory was evolved from isospory independently by several plant groups in the Devonian period as part of the process of evolution of the timing of sex differentiation. Heterosporic plants produce small spores called microspores which either germinate to become male gametophytes or have reduced male gametophytes packaged within them, and similarly larger spores called megaspores that germinate into female gametophytes, or which have female gametophytes packaged within them.


Which one of the following aspects is an exclusive characteristic of living things ?



Consciousness is the exclusive characteristic of living organisms as only living organisms are aware of their surroundings. Therefore, the correct option is Option C.


Which one of the following organisms is scientifically correctly named, correctly printed according to the International Rules of Nomenclature and correctly described?



As per the  International Rules of Nomenclature, the scientific name consists of two parts, genus and species. Both genus and species are either italicized or are underlined. In genus, the first letter is capital whereas species name is always written in lower case letters. Musca domestica is the common house fly. In option A, the scientific name is not italicized. Plasmodium falciparum is a protozoan pathogen causing the most serious type of malaria. Felis tigris is the scientific name of Indian tiger. In option B, the first letter of genus Felis is not written in capital letter. Escherichia coli is the full name of E. coli. It commonly occurs in the human intestine.


Which one of the following is NOT a correct statement ?

[NEET 2013]


 Museum – Biological museums are generally set up in  educational institutes such as schools and colleges. Museums have collections of preserved plant and animal specimens for study and reference. Specimens are preserved in the containers or jars in preservative solutions. Plant and animal specimens may also be preserved as dry specimens. Insects are preserved in  insect boxes after collections, killing and pinning. Larger animals like birds and mammals are usually stuffed and preserved. Museums often have collections of skeletons of animals too.


The common characteristics between tomato and potato will be maximum at the level of their


Families are characterized on the basis of both vegetative and reproductive features of plant species. Tomato (Lycopersicon esculentum) and potato (Solanum tuberosum) belongs to the same family solanaceae.

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