The Living World: Class 11 Biology Q&A · Page 2
43 free answers on The Living World (Biology) for Class 11 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- BiologyClass 11CBSE
Name the families of (a) Mangifera indica and (b) Triticum aestivum.
Answer: (a) Mangifera indica (Mango): Anacardiaceae (b) Triticum aestivum (Wheat): Poaceae (also known as Gramineae) Family names in plants typically end with the suffix '-aceae', which helps in their identification within taxonomic literature.
- BiologyClass 11All
what is species in biology class 11
Living world is organised and categorised by various systems. Carolous Linnaeus divided all organisms into large groups called kingdoms. Kingdoms were further classified and subdivided. The criteria of such classification was variety of factors like similarity in structure, function etc. Later systems included evolutionary relationships to establish categories. The idea was that features might be lost, gained or modified according to time. Towards this the categories were arranged in a hierar
- BiologyClass 11All
what is nomenclature in biology class 11
Nomenclature means a system of identifying and naming organisms. While there have been old systems which used common usage or property to name organisms scientifically this process dates back to Carolus Linnaues who gave the Binomial nomenclature. Binomial nomenclature is the system that assigns a 2 part name to each organism. The first part represents the name of the Genus and the second part stands for the species. Genus must be capitalized where as species name must be not. When written th
- BiologyClass 11All
What is systematics in biology class 11
Systematics is a branch of biology that deals with the classification of organisms by understanding evolutionary relationships. Classification systems scientifically started with Carolus linnaeus when he gave is two kingdom classification system using the external characteristics. Eventually, more systems by Hackael, Copeland, and Whittaker came into being. With the understanding of evolution, scientists could figure that the characteristics they used may not be true measure as it shifts with
- BiologyClass 11All
What is taxonomy in biology class 11
Taxonomy is the science of identifying, naming and categorising organisms based on several characters. Several systems of classification has been developed. Carolous linnaeus gave the Two kingdom classification which grouped organisms into plants or animals. Ernst Hackel gave the third kingdom Protista. Kingdoms are largest categories. This was followed by Copeland who introduced Monera, the kingdom of prokaryotes. Whittaker gave the 5 kingdoms classification which added fungi and was followe
- BiologyClass 11All
What is genus in biology
According to old surveys, around 5 million varieties of organisms existed. Modern estimates place the count at 8.7 million. It becomes difficult to study this huge variety of organisms. That is why we divide the organisms into categories. This was started by Carolous linnaeus who divided all organisms into 2 kingdoms, thus giving the two-kingdom classification system. Kingdoms are future categorised into Phyla which are further categorised into Classes. Classes are categorised into o
- BiologyClass 11All
What is lichen in biology
Lichen is a symbiotic association between algae and fungi. Algae are photosynthetic and hence fix carbon and energy needs for the lichen. They are referred to as phycobiont. Fungi are saprotrophic in nature. They absorb inorganic substances for lichen. They are often referred as mycobiont. Both of these are very often the pioneer species, which means they are the first to inhabit a particular ecosystem, given their ability to be least dependent on other organisms. Lichens are also highly susc
- BiologyClass 11All
What is organism in biology
An organism or a living organism has been challenging to define. Most popular definitions group several characteristics as definitions. A comprehensive definition states that a living organism is a self-maintained chemical entity capable of response, reproduction and evolution. All living organisms- a bacterium or a dinosaur had perfect organised structures ranging from that of the plasma membrane’s bilayer nature to the chambers of the heart (in higher organisms). But these structures
- BiologyClass 11All
What is monera in biology?
Carl Linaaeues gave two kingdom classification and classified the organisms into two major kingdoms, plant and animal kingdom namely. But this system classification was not accepted much as it combines all the unicellular, multicellular, eukaryotic and prokaryotic organisms. Very later R.H whittaker gave five kingdom classification and placed each of the organisms on basis of cellular organization, reproduction, cell wall composition and so on. Amongst the classification of whittaker the very
- BiologyClass 11All
What is Systematics in biology?
When we study the diversification and classification of organisms it comes under the branch of biology namely systematics. Systematics deals with classification and nomenclature of organisms.Specific traits of the organism are studied and the relation between these organisms are taken into consideration in systematics. Many times this branch of biology is studied in accordance with taxonomy. Within the field of taxonomy, identification is one the step to describe an organism.Org
- BiologyClass 11All
How many biological kingdoms are there in biology?
In biology organisms are classified into five kingdoms namely- Monera, protista, fungi, plantae and animalia.Earlier only two kingdoms were proposed namely plantae and animalia. But fungi were having traits that coincide with animalia, plantae kingdom both, there a need was felt to bifurcate the kingdoms into five. Robert Whitaker proposed Five kingdom classification, which includes five kingdoms namely-Monera, protista, fugi, plantae and animalia. These kingdoms are nothing but
- BiologyClass 11All
What is identification in biology?
Within the field of taxonomy, identification is one the step to describe an organism.Organism is identified using morphological i.e external features or the anatomical features, i.e the internal cellular organization.Apart from identification, two more steps are involved in the field of taxonomy. Identification, nomenclature and classification are three core areas concerned with taxonomy to successfully classify and categorize organisms. Specific characteristics of an organism get rec
- BiologyClass 11All
What is kingdom in biology?
Robert whitaker proposed Five kingdom classification, which includes five kingdoms namely-Monera, protista, fugi, plantae and animalia. These kingdoms are nothing but the highest taxonomic ranks. Organisms were categorized as per their characteristic features, these groups are formed on basis of level of similarities. Amongst all the categories, kingdoms is the top most hierarchy. Kingdom is further composed of phylum for animals and divisions for plants. I
- BiologyClass 11All
What is the symbiotic association between fungi and algae called?
The symbiotic association between fungi and algae is called lichen. In this unique partnership, the fungus provides protection, moisture retention, and structural support, while the algae or cyanobacteria (photobiont) perform photosynthesis to produce food for both organisms. This mutualistic relationship allows lichens to thrive in extreme environments where neither organism could survive independently, such as bare rocks, tree bark, and arctic tundra. Lichens serve as impor
- BiologyClass 11All
Write a short note on Kingdom Protista.
Kingdom Protista encompasses unicellular or simple multicellular eukaryotic organisms that don't fit into plant, animal, or fungi kingdoms. Proposed by Ernst Haeckel and refined in Whittaker's five-kingdom system. Key characteristics: Cell structure: Eukaryotic cells with membrane-bound nucleus and organelles Organization: Primarily unicellular; some colonial or simple multicellular fo
- BiologyClass 11All
Which categories are listed in hierarchy in the classification of organisms?
The hierarchical categories (taxonomic ranks) in biological classification, from broadest to most specific, are: Kingdom - Largest, most inclusive group (e.g., Animalia, Plantae) Phylum/Division - Division is used for plants; Phylum for animals (e.g., Chordata, Angiospermae) Class - Subdivision of phylum (e.g., Mammalia, Dicotyledonae) Order - Grou
- BiologyClass 11All
Briefly explain sub-kingdom Cryptogamae.
Sub-kingdom Cryptogamae (meaning "hidden reproduction") includes plants with inconspicuous or hidden reproductive organs that don't produce flowers or seeds. The term comes from Greek "kryptos" (hidden) and "gamos" (marriage/reproduction). Characteristics: Non-flowering plants Reproduce through spores rather than seeds Include both vascular and non-vascular plants Lack true fruits <li
- BiologyClass 11All
Who wrote "The Origin of Species"?
Charles Darwin authored the groundbreaking scientific work "On the Origin of Species by Means of Natural Selection" (commonly shortened to "The Origin of Species"), published on November 24, 1859. This revolutionary book introduced the scientific theory of evolution through natural selection, fundamentally transforming biological sciences and our understanding of life's diversity. Darwin's observations during his voyage on HMS Beagle, particu
- BiologyClass 11All
Which organisms have naked embryos?
Gymnosperms are the group of seed-bearing plants characterized by naked embryos or naked seeds. The term "gymnosperm" comes from Greek words "gymnos" (naked) and "sperma" (seed), indicating that their seeds are not enclosed within fruits or ovaries. Instead, seeds develop exposed on the surface of cone scales or similar structures. Common examples include conifers (pine, fir, spruce), cycads, ginkgo, and gnetophytes. This distinguishes them from angiosperms (
- BiologyClass 11All
What does the word 'thallose' mean from the word 'Thallophyta'?
The term "thallose" or "thallus" (from Greek "thallos" meaning young shoot or twig) refers to a simple, undifferentiated plant body lacking true roots, stems, and leaves. In Thallophyta, the plant body is a thallus a relatively simple structure without distinct tissue differentiation. This contrasts with higher plants that have specialized organs and vascular tissue. Thallophytes include algae, fungi, and lichens, where the entire body absorbs nutrients and water, rather than having specializ