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Test: Biological Classification 7 - From Past 28 Years Questions


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Test: Biological Classification 7 - From Past 28 Years Questions - Question 1

The causal organism for African sleeping sickness is [1989]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 1

African sleeping sickness disease also called trypanosomiasis common in Africa is caused by parasite Trypanosoma gambiense. The parasite is transmitted by Tse-Tse fly (Glossina palpalis).

Test: Biological Classification 7 - From Past 28 Years Questions - Question 2

The vector for sleeping sickness is [1989]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 2

Vector for sleeping sickness is TseTse fly (Glossina palpalis). The parasite Trypanosoma is transmitted through the bite of this fly. Tse-tse have been extensively studied because they are biological vectors of the African trypanosomiasis, deadly disease which include sleeping sickness in people and nagana in cattle. Tse-tse have existed in the modern morphological form for at least 34 million years since fossil tse-tse have been recovered from the Florissant Fossil Beds in Colorado.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 3

Trypanosoma belongs to class [1989]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 3

Zooflagellata of Protozoan Protista. They have flagella and heterotrophic (Parasitic) mode of nutrition.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 4

Malaria fever coincides with liberation of

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 4

Malarial parasite, (Plasmodium vivax), Protist of class Sporozoa, digenetic  parasite causes malarial fever in human. The  malarial parasite was discovered by Laveran (1880). Sir Ronald Ross (1898) discovered that Malaria disease is spread by mosquitoes. Its life cycle completes in two organisms-Primary host, female Anopheles mosquito and man (Intermediate or Secondary host). It enters into human blood-through sporozoites. Malarial fever begins with the release of merozoites in the liver cells, from RBC of human.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 5

A bite of Tse-Tse fly may pass to humans

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 5

Tse-Tse fly is vector of sleeping sickness disease and it transmits Trypanosoma gambiense through its bite.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 6

The infective stage of malarial parasite Plasmodium that enters human body is [1989]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 6

Sporozoites are small, spindle-shaped, uninucleate organisms present in the salivary glands of the mosquito. Sporozoites represent the infective stage, which along with saliva inoculates into the blood stream of human and undergo schizogony.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 7

Lichens indicate SO2 pollution because they [1989]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 7

Lichens typically grow in harsh environments in nature, most lichens, especially epiphytic fruticose species and those containing cyanobacteria, are sensitive to manufactured pollutants. Hence, they have been widely used as pollution indicator organisms.
Lichens are symbiotic associations of a fungus with a photosynthetic partner (called a photobiont or phycobiont) that can produce food for the lichen from sunlight.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 8

Which one  belongs to monera? [1990]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 8

Whittaker (1969) divided organisms into five kingdoms : Monera, Protista, Plantae, Fungi and Animalia. Kingdom Monera includes all prokaryotes – Mycoplasma, bacteria, actinomycetes, blue-green algae, archaebacteria, methanogens. Escherichia is bacteria, Amoeba, Gelidium come under Protista, Spirogyra is algae.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 9

The main difference in Gram (+)ve and Gram (–)ve bacteria resides in their [1990, 2001]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 9

Gram +(ve) and Gram –(ve) bacteria separates on the basis of their cell wall composition. Christian Gram on the basis of staining behaviour of the cell wall with Gram’s stain, grouped bacteria into Gram +ve and Gram –ve type. The bacteria  which retain blue or purple colour after staining are Gram +ve e.g. Bacillus subtilis and which loses blue colour is Gram –ve e.g.
E. coli. In Gram  –ve stain is washed due to high lipid content in the cell wall having thick wall, Gram +ve has single layered cell wall

Test: Biological Classification 7 - From Past 28 Years Questions - Question 10

Genetic information in Paramecium is contained in [1990]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 10

Paramecium has two nuclei

Test: Biological Classification 7 - From Past 28 Years Questions - Question 11

Which is true about Trypanosoma ? [1990]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 11

Trypanosoma is polymorphic i.e. it exists in different forms in the successive stages of its life cycle. These are Leishmania, Leptomonad, Crituidial and trypanosomal stages.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 12

Amoebiasis is prevented by [1990]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 12

Amoebiasis or amoebic dysentry is caused by a parasite Entamoeba histolytica present in the upper  part of large intestine of human.
It is caused due to ingesting contaminated food or water with cyst (trophozoite) of Entamoeba. It feeds on R.B.C of intestinal blood capillaries and damages intestinal mucosa secreting an enzyme - histolysin.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 13

Plasmodium, the malarial parasite, belongs to class[1990]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 13

Plasmodium belongs to class Sporozoa of protozoan profists. It is an endoparasite lacking any locomotony structure and contractile vacules. It reproduces through spore formation.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 14

A nonphotosynthetic aerobic nitrogen fixing soil bacterium is [1990, 1994]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 14

Azotobacter is free living soil bacteria that are able to pick up dinitrogen from the soil and fixes it into organic nitrogenous material like aminoacid. Clostridium is anaerobic free living soil N2 fixing bacteria. Rhizobium is symbiotic N2 fixing bacteria.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 15

Absorptive heterotrophic nutrition is exhibited by [1990]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 15

Fungi are nutritionally saprophytes, which grow on dead and decaying matter . They secrete enzyme to the external medium where digestion takes place and digested food absorbed by the body surface. They convert complex organic constituents of dead body into simple soluble forms. That is why Fungi are decomposers.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 16

Who discovered Plasmodium in R.B.C of human beings ? [1991]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 16

Laveran discovered Plasmodium in R.B.C of human beings and concluded that malaria is caused by Plasmodium vivax. Sir Ronal Ross (1896) was the first to observe oocytes of Plamodium in female Anopheles.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 17

Malignant tertian malarial parasite is [1991]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 17

In human beings different types of malaria are caused by 4 different species of Plasmodium. They are :
1. Benign Tertian Malaria –  Plasmodium vivax.
2. Malignant (Pernicious or cerebral) Tertian Malaria – Plasmodium falciparum.
3. Quartan Malaria – Plasmodium malariae.
4. Mild Tertian Malaria –  Plasmodium ovale.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 18

Name the organisms which do not derive energy directly or indirectly from sun [1991]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 18

Chemosynthetic bacteria does not require sunlight as a source of energy directly or indirectly. The energy for the synthesis of food is obtained by the oxidation of certain inorganic substances present in the medium. The chemical energy obtained from oxidation reaction is trapped in ATP molecules. The ATP is used in CO2 assimilation.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 19

African sleeping sickness is due to [1991]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 19

I. African sleeping sickness disease also called as trypansomiasis common in western and central parts of African continent.
II. The disease is caused by parasite Trypanosoma gambiense of class zooflagellata.
III. The parasite is transmitted (vector) through bite of Tse-Tse fly (Glossina palpalis).
IV. The disease appears when the causal organism enters into cerebrospinal fluid of human.
V. Trypanosoma is an obligate parasite, Digenetic and Polymorphic organism.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 20

In Amoeba and Paramecium osmoregulation occurs through [1991, 2002]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 20

Contractile vacuole in Amoeba and Paramecium maintain the water balance of the cell. This is known as osmoregulation.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 21

Bacteria lack alternation of generation because there is [1991, 1992]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 21

In bacteria asexual reproduction through binary fission is the most common method of multiplication. Sexual reproduction which comprises of syngamy and meiosis is entirely absent. Hence no gamete formation takes place. In sexually reproducing organism alternation of generation occurs.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 22

The part of life cycle of malarial parasite Plasmodium vivax, that is passed in female Anopheles is  [1992]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 22

P. vivax is a causative agent of malaria. The life cycle of Plasmodium is characterized by an exogenous sexual phase (sporogony), in which multiplication occurs in female Anopheles mosquitos and an endogenous asexual phase (schizogony) which take place in the RBCs of the infected host.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 23

Organisms which are indicator of SO2 pollution of air [1992]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 23

Lichens are composite organisms representing a symbiotic association between fungus and a algae. It can be Crustose, Foliose and Fruticose types. They are the pioneer organisms in a new habitat. Lichens used as indicator of air pollution. It does grow in the environment where pollution level is high, SO2 is strong air pollutant and lichens are very sensitive to SO2.

Test: Biological Classification 7 - From Past 28 Years Questions - Question 24

Escherichia coli is used extensively in biological research as it is [1993]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 24

Escherichia coli, lives as a symbiont in human intestine. 

Test: Biological Classification 7 - From Past 28 Years Questions - Question 25

Genophore/bacterial genome or nucleoid is made of [1993]

Detailed Solution for Test: Biological Classification 7 - From Past 28 Years Questions - Question 25

The bacterial genome/nucleoid is made of single circular double stranded DNA without histone protein as it is a prokaryotic organisms. The genome contains some 100 chemical sites or loci. Each locus contains many genes. E coli contains about 4000 genes.

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