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Test: Biological Classification 6 - From Past 28 Years Questions


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Test: Biological Classification 6 - From Past 28 Years Questions - Question 1

If all ponds and puddles are destroyed, the organism likely to be destroyed is [1993]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 1

Plasmodium transmitted through female Anopheles mosquito to Human and the most favourite dwelling place for Anopheles is water or moist places like ponds and puddles.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 2

Schizogont stage of Plasmodium occurs in human cells [1993]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 2

Schizogont or Asexual stage occurs in human erythrocytes and liver cells.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 3

Reverse transcriptase is [1994]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 3

H. Temin and D. Baltimore (1970) discovered that tumor viruses contain RNA as genetic material and replicate by synthesizing complementary DNA. This process is called reverse transcription and it is carried by an RNA dependent DNA polymerase called as reverse transcriptase.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 4

Tobacco Mosaic Virus (TMV) genes are [1994]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 4

All viruses are nucleoprotein (Nucleic acid + Protein) in the structure. The nucleic acid (DNA and RNA) is genetic material. In a particular virus either DNA or RNA is genetic material never both are present in a virus. Hence viruses are : (i) Double stranded  DNA or ds DNA - Hepatitis B (ii) Single stranded DNA or ss DNA - coliphage (iii) Double stranded RNA or ds RNA - Reo virus, wound Tumor virus (iv) Single stranded RNA or ss RNA - Tobacco mosaic virus (TMV)

Test: Biological Classification 6 - From Past 28 Years Questions - Question 5

Organelle/organoid involved in genetic engineering is [1994]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 5

Besides Nuclear DNA, bacteria possesses extranuclear DNA (outside the nucleoid region) called as plasmid which can replicate independently. Due to this property plasmid holds great importance in genetic engineering. Plasmid can be taken out of bacteria and made to combine with desired DNA segment. A plasmid carrying DNA of other organism now it is known as cosmid which can be introduced into any desired cells. This is the basis of genetic engineering.

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

The term antibiotic was first used by [1994, 2003]

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

The term antibiotics was coined by Waksman but the first known antibiotic, penicillin was extracted from fungi  Penicillium notatum by A Flemming 1944. Antibiotics are the chemicals that are produced from the living organisms, used to  kill another living organisms. About 2300 antibiotics discovered so far e.g. Streptomycin, Tetracycline etc.

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

Temperature tolerance of thermal blue-green algae is due to [1994]

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

Some of the blue green algae can tolerate extremes of temperature due to presence of gelatinous sheath, and compactness of protein molecules in protoplasm.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 8

Nonsymbiotic nitrogen fixers are [1994]

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Azotobacter is nonsymbiotic, free living nitrogen fixing bacteria.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 9

Rickettsiae constitute a group under [1994]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 9

Rickettsias are tiny obligate, intracellular parasites found in blood sucking insects like lices, mites, ticks. They were first observed by Ricketts 1909 but it was properly described by Rocha-lime 1916, who named them as  Rickettsia. They have mucopeptide cell wall with DNA as genetic material and are independent entity produces diseases like Q-fever, typhus etc

Test: Biological Classification 6 - From Past 28 Years Questions - Question 10

Nitrogen fixer soil organisms belong to [1994]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 10

Only some bacteria and Blue green algae (cynobacteria) has capacity to fix atmospheric nitrogen.         

  • Bacteria     :     Azotobacter, Rhizobium, Frankia etc.   
  • Blue    green    algae    :        Nostoc, Oscillatoria, Anabaena etc.
Test: Biological Classification 6 - From Past 28 Years Questions - Question 11

Protistan genome has [1994]

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Protistans are eukaryotes and their genetic material is organised in form of nucleus. DNA is associated with histone protein.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 12

Entamoeba coli causes

[1994]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 12

 Pyrrhoea is caused by bacterial infections along with other factor, Diarrhoea by caused by rotavirus along with many other factor. Dysentery by Entamoeba histolytica.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 13

Protists obtain food as [1994]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 13

Members of kingdom Protista have diverse mode of nutrition. They are photosynthetic, saprophytic parasitic and ingestive. They are major  heterotroph.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 14

Protista includes [1994]

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Kingdom Protista includes flagellates (euglenophyceae), diatoms, dinoflagellates, slime moulds, sarcodines, ciliates, sporozoans. They are photosynthetic, chemotrophic, heterotropic in mode of nutrition.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 15

Ustilago caused plant diseases called smut because [1994]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 15

The genus Ustilago includes the group of fungi producing lack, sooty powder mass of spores on the host pl(mt peris imparting them a burnt appearance, hence, the name, the black dusty masses of spores produced by these fungi resemble soot or smut, so these are also known as smut fungi.

 

So, the correct answer is 'They develop sooty masses of spores.'.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 16

Claviceps purpurea is causal organism of

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 16

The fungus that causes the disease ‘Ergot of Rye’ is  Claviceps purpurea.  It contains many poisonous alkaloids. The hallucinogenic drug LSD is extracted from this fungi.   

  • Rust     of      wheat     is     used     by     Puccinia graminis.
  • Powdery     Mildew     of      Pea     is     caused     by  Erysiphae.
Test: Biological Classification 6 - From Past 28 Years Questions - Question 17

Decomposers are organisms that [1994]

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Decomposers act on dead bodies converting complex organic constituents into simple soluble form.
They obtain their energy from dead organisms. Decomposers themselves are organisms (often fungi, earthworms, or bacteria) that break down organic materials to gain nutrients and energy. Decomposers accelerate the natural process of decomposition. They supply the required nutrients for other trophic levels.

The fungi on the tree are decomposers.
When an organism dies, it leaves behind nutrients that are locked tightly together. A scavenger might eat the carcass, but its feces would still contain a considerable amount of unused energy and nutrients. Decomposers will later induce further breakdown. This last step releases raw nutrients (such as nitrogen, phosphorus and magnesium) in a form usable to plants, which quickly incorporate the chemicals into their own cells. This process greatly increases the nutrientload of an ecosystem, in turn allowing for greater biodiversity. 

Test: Biological Classification 6 - From Past 28 Years Questions - Question 18

Mycorrhiza represents [1994, 2003]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 18

Mycorrhiza is symbiotic association between fungi and roots of higher plants. Mycorrhiza form wooly covering of fungal hyphae on the surface and remain in upper layers. It is of two types Ecto and Endomycorrhiza. In some endomycorrhiza, the fungal hyphae develop some organs called vesicles within the root cortical cells, such mycorrhizae are called VAM (vesicular arbuscular mycorrhizae) . It is meant for phosphate nutrition.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 19

The plasmid [1995]

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The term ‘plasmid’ was  introduced by Lederberg in 1952 for extragenomic DNA segment. It is a small circular molecule of DNA found in bacterial cell in addition to the larger circular bacterial DNA.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 20

Which of the following organism possesses characteristics of both a plant and an animal?

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 20

The Euglena is an organism, which possesses both the characteristics of plants and animals, as it can move with a flagella and also contains chlorophyll. Its nutrition is mixotrophic.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 21

The function of contractile vacuole, in protozoa, is [1995]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 21

In protozoa, the function of contractile vacuole is the removal of excretory substances, carbon dioxide etc. It is very essential to regulate water content i.e., osmoregulation.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 22

Macro  and  micronucleus are the characteristic feature of [1995]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 22

The macronucleus lacks nuclear membrane and is formed of trophochromatin. It regulates the metabolic activities of the body and it is also known as trophonucleus. The micronucleus has a definite nuclear membrane and controls the reproductive activities of Paramecium and Vorticella.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 23

Excretion in Amoeba occurs through [1995]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 23

The conractile vacuole is supposed to assist excertion in Amoeba, as its watery contents possess traces of carbon dioxide and urea. The CO2 diffuses directly through plasmalemma.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 24

The organism, used for alcoholic fermentation, is [1995]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 24

Fermentation refers to the breakdown of organic substances, particularly carbohydrates, under anaerobic conditions. Saccharomyces cerevisiae is used for fermenting carbohydrate. The ethyl alcohol and carbon dioxide are formed at the end of the process.

Test: Biological Classification 6 - From Past 28 Years Questions - Question 25

Which of the following is not correctly matched? [1995]

Detailed Solution for Test: Biological Classification 6 - From Past 28 Years Questions - Question 25

Covered smut of barley is caused by Ustilago hordei, not by Ustilago nuda. This disease is purely externally seed borned.

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