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 Multiple Choice QuestionsMultiple Choice Questions

1.

In Entamoeba histolytica, the presence of chromatid bodies is characteristic of

  • precystic stage

  • mature quadrinucleate stage

  • trophozoite stage

  • mature binucleate stage


A.

precystic stage

In Entamoeba histolytica, the precystic or minute forms encyst only in the lumen of the intestine. In precystic stage, the chromatid bodies are found which disappear as the cysts mature.


2.

Mycorrhiza is correctly described as

  • symbiosis of algae and fungi

  • relation of ants with the stem of some trees

  • parasitic association between roots and some fungi

  • symbiotic relationship between fungi and roots of some higher plants


D.

symbiotic relationship between fungi and roots of some higher plants

Mycorrhiza is a symbiotic association between a fungus and the roots of a vascular host plant (higher plants). It mainly refers to the role of the fungi in the plants rhizosphere, its root system.


3.

The part of mushroom comes out from soil is called

  • basidiocarp

  • ascogonium

  • ascocarp

  • pericarp


A.

basidiocarp

Basidiocarp is the part of mushroom that comes out from soil.

Ascogonium is a female reproductive body in some ascomycetous fungi from which asci are produced.

Ascocarp is the fruiting body (sporocarp) of an ascomycete Phylum fungus. It consists of very tightly interwoven hyphae and may contain millions of asci, each of which typically contains four to eight ascospores.

Pericarp is the part of a fruit formed from the wall of the ripened ovary.


4.

The protists have

  • only free nucleic acid aggregates

  • membrane bound nucleoproteins lying embedded in the cytoplasm

  • nucleoprotein in direct contact with the rest of the cell substance

  • none of these


B.

membrane bound nucleoproteins lying embedded in the cytoplasm

Protists are a very diverse group of organisms. They are eukaryotic micro- organisms. They have membrane bound nucleoproteins lying embedded in the cytoplasm. They are primarily microscopic and unicellular or made up of a single cell.


5.

In Pteridium meiosis takes place at the time of

  • spore formation

  • organ formation in prothallus

  • spore germination

  • gamete formation


A.

spore formation

Spore formed by meiotic division in spore mother cell is the first gametophytic structure in Pteridium.


6.

Some Gram -ve bacteria have peptidoglycan and an extra layer of

  • lipo-polysaccharide

  • techoic acid

  • cellulose

  • both (b) and (c).


A.

lipo-polysaccharide

In Gram negative bacteria, cell wall is two layered. The cell wall contains peptidoglycan in the inner layer. The outer layer consists of lipopolysaccharides, proteins and phospholipids. 


7.

Blue- green algae is found in

  • Cycas

  • Pinus

  • Scales of Marchantia

  • Riccia


A.

Cycas

The coralloid roots of Cycas has an algal zone which consists of Blue- Green algae Anabaena cycadeal and Nostoc punctiforme.


8.

Which of the following structures helps in the respiration of lichens?

  • Soredia

  • lsidia

  • Cyphella

  • Cephalodia


C.

Cyphella

Cyphella are small depressions or cavity like openings into the medulla on the ventral surface of the thallus of certain lichens. They perform respiratory functions.


9.

Which of the following is non-pathogenic bacteria of colon?

  • Escherichia coli

  • Balantidium coli

  • Entamoeba coli

  • Enterobius vermicularis


A.

Escherichia coli

Escherichia coli is the non-pathogenic bacteria of colon. One of the characteristics of  Escherichia coli is the production of bacteriocins (colicins), a specific type of metabolite which is not only lethal to the organism of the same species but also to related organisms.

Balantidium coli results in inflammation of alimentary tract.

Entamoeba coli causes amoebic dysentery.

Enterobius vermicularis infection is known as oxyuriasis or enterobiosis.


10.

Which of the following is an edible fungus?

  • Agaricus

  • Albugo

  • Rhizopus

  • Puccinia


A.

Agaricus

Agaricus is an edible mushroom. It is a saprophytic fungus, which grows during rainy season, in moisture grassy places and in richly manured unploughed fields.