Important Questions for Class 11 Biology 2nd Chapter Biological Classification MCQ, Very Short, Short Type, Long Type
CBSE Class 11 Important Questions for Class 11 Biology Chapter 2 Biological Classification all MCQ Type, Very Short Type, Assertion Reason Type, Case Study, Short Type and Long Type Questions with Answers by Expert. Important Questions for Section A, B, C, D Class 11 Biology Chapter 2.
- MCQ’s
Q.1) __________ are commonly known as imperfect fungi
a) ascomycetes
b) basidiomycetes
c) deuteromycetes
d) phycomycetes
Q.2) Which organisms are the chief ‘producers’ in the oceans.
a) Diatoms
b) Golden algae
c) dinoflagellates
d) Euglena
Q.3) organism responsible for generation of red tide is
a.) Euglena
b.) Gonyaulax
c.) Paramecium
d.) Diatoms
Q.4) Ruminant animals’ stomachs contain archaebacteria like _________
a.) Methanogens
b.) halophiles
c.) thermophiles
d.) thermoacidophiles
Q.5) According to five-kingdom classification, organisms in group Monera does not contain ___________
a.) Cell wall
b.) Nuclear membrane
c.) plasma membrane
d.) nucleic acid
Q.6) which kingdom is mainly comprising of prokaryotic organisms
a.) Monera
b.) Protista
c.) Fungus
d.) Plantae
Q.7) In the following options which is Not correct?
a.) Saprotrophic fungi feeds on dead and decaying organic matter.
b.) Parasitic fungi feeds on dead animals and plants
c.) In Mycorrhiza, fungus is in close association with roots of higher plants
d.) Lichens is a close association of fungi with algae.
Q.8) Bacteria that live in salty areas are known as
a.)Methanogens
b.)halophiles
c.) barophiles
d.) thermoacidophiles
Q.9) Photosynthetic autotrophs helps in _________
a.) Vitamin, antibiotic, organic acid production
b.) beer and wine production
c.) fixing atmospheric nitrogen
d.) nutrient recycling
- Answer in one sentence
Q.1) On what characters is the classification of organisms based?
Ans. Classification is based on characteristics such as gross morphology, cell structure, wall nature, mode of nutrition, habitat, methods of reproduction, and evolutionary relationships.
Q.2) Which criteria were used by R.H. Whittaker to classify organism in the 5-kingdom system?
Ans. R.H. Whittaker’s primary classification criteria include cell structure, body organization, mode of nutrition, reproduction, and phylogenetic relationships.
Q.3) What are the main groups of Bacteria based on their shape?
Ans. The spherical Coccus (pl.: cocci), the rod-shaped Bacillus (pl.: bacilli), the comma-shaped Vibrium (pl.: vibrio), and the spiral Spirillum (pl.: spirilla) are the four types of bacteria classified on the basis of shape.
Q.4) What is mycoplasma?
Ans. Mycoplasma are bacteria that lack a cell wall altogether. They are the world’s tiniest living cells, capable of surviving without oxygen. In animals and plants, many mycoplasmas are pathogenic.
Q.5) What is capsid?
Ans. Capsid is the protein covering that envelopes virus. It guards the nucleic acid and is made up of many smaller subunits called capsomeres. These capsomeres are arranged in helical or polyhedral manner to form the capsid.
Q.6) Name any 2 diseases caused by prions.
Ans. the 2 diseases caused by prion are
1.) Bovine spongiform encephalopathy (BSE) or mad cow disease
2.) Cr–Jacob disease (CJD)
Q.7) What are the 2 components of lichens?
Ans. Phycobiont and Mycobiont are the 2 components of lichens. Phycobiont refers to the algal component, while mycobiont refers to the fungal component of lichens.
Q.9) Which groups are included in the Kingdom Protista?
Ans. The major groups in Protista include Chrysophytes, Dinoflagellates, Euglenoids, Slime moulds and Protozoans
- Answer in short
Q.1) What was the basis of classification scheme given by Aristotle?
Ans. 1.) Aristotle was the first to classify organisms on a scientific basis using morphological characters.
2.) He classified plants into trees, shrubs, and herbs based on simple morphological characteristics.
3.) He also categorized the animals into two groups: those with red blood and those without.
Q.2) State the drawbacks of Linnaeus two kingdom classification.
Ans. 1.) Linnaeus developed a Two Kingdom system of classification with Plantae and Animalia kingdoms.
2.) This system did not distinguish between eukaryotes and prokaryotes, unicellular and multicellular organisms, photosynthetic (green algae) and non-photosynthetic (fungi) organisms. 3.) The classification of organisms into plants and animals was simple and straightforward, but a large number of organisms did not fit into either category.
4.) As a result, the long-used two-kingdom classification was considered ineffective.
Q.3) Why are fungus placed in a different kingdom and not included in the plant kingdom in the 5-kingdom classification system?
Ans.1.) The fungi are heterotrophic organisms whereas green plants are autotrophic.
2.) The walls of the fungi were made of chitin, whereas the green plants had a cellulose cell wall. 3.) When these features were taken into account, the fungi were given their own kingdom – Kingdom Fungi in the five-kingdom classification system.
Q.4) What is alternation of generation in plants?
Ans. 1.) Plants have two unique phases in their life cycle: diploid sporophytes and haploid gametophytic, which alternate with one another.
2.) The lengths of the haploid and diploid phases, as well as whether they are free-living or dependent on others are varied between plant families.
3.) This is called alternation of generation.
Q.5) Describe the 3 steps which are essential in sexual reproduction of fungus.
Ans. the 3 steps are as follows
(i) Plasmogamy is the fusion of protoplasm’s between two motile or non-motile gametes.
(ii) Karyogamy, which is the fusion of two nuclei.
(iii) In a zygote, meiosis results in haploid spores.
- Answer in brief
Q.1) What are the characteristic features of organisms in kingdom animalia?
Ans.1.) This kingdom is made up of heterotrophic eukaryotic creatures that are multicellular and lack cell walls.
2.) They rely on plants for food, either directly or indirectly. They have internal digestive system and food reserves are stored as glycogen or fat.
3.) Their form of nourishment is holozoic
4.) They have a distinct growth pattern and mature into adults with distinct shapes and sizes.
5.) Higher forms have more complex sensory and motor mechanisms. The majority of them can move around.
6.) Male and female copulation is followed by embryological development in sexual reproduction.
Q.2) Describe the four major groups of protozoans in detail?
Ans. 1.) Amoeboid protozoans can be found in freshwater, seawater, or moist soil. they move and seize their prey by putting out pseudopodia (false feet). Silica shells cover the surface of marine organisms. Some of Entamoeba are parasitic organisms.
2.) Flagellated protozoans are either free-living or parasitic protozoans that have flagella. Sleeping sickness is caused by parasitic versions of the parasite. Trypanosoma is a good example.
3.) Because of the existence of thousands of cilia, ciliated protozoans are watery, actively moving organisms. They have a cavity (gullet) on the cell surface that opens to the outside. The water packed with food is directed towards the gullet by the coordinated movement of rows of cilia. Paramecium is a good example.
4.) Sporozoans are a group of organisms that go through a life cycle that includes an infectious spore-like stage. Plasmodium (malarial parasite), which causes malaria, is the most well-known. Malaria is a disease that has a devastating impact on the human population.