Multiple Choice QuestionsMycorrhiza 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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
