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 Multiple Choice QuestionsMultiple Choice Questions

11.

In Spirogyra sometimes a ladder like structure  is present due to

  • vegetative reproduction

  • asexual reproduction

  • lateral conjugation

  • scalariform conjugation


D.

scalariform conjugation

Sexual reproduction in Spirogyra takes place by conjugation. Scalariform conjugation occurs between the cells belonging to different filaments. Hence, these species are heterothallic. Lateral conjugation is primitive than scalariform conjugation.


12.

Which of the following taxonomist described classification of plant kingdom in "Families of flowering plants" ?

  • Cronquist

  • Takhtajan

  • Benson

  • Hutchinson


D.

Hutchinson

John Hutchinson described classification of plant kingdom in "Families of flowering plants".


13.

In which genera endospores are formed for reproduction

  • Monococcus and Clostridium

  • Bacillus and Clostridium

  • Mucor and Bacillus

  • None ofthe above


B.

Bacillus and Clostridium

Some species of bacteria reproduce sexually with the help of endospores. Endospores are thick-walled spores, formed singly in a bacterial cell. These are commonly seen in the species of Bacillus and Clostridium.


14.

Black rust of wheat is a fungal disease caused by

  • Melampsora lini

  • Claviceps Purpurea

  • Albugo candida

  • Puccinia graemzinis tritici


D.

Puccinia graemzinis tritici

Puccinia graminis tritici belongs to class Basidiomycetes. It causes black rust of wheat.


15.

In the sporogonium of which plant, columella is present ?

  • Penicillium

  • Spirogyra

  • Rhizopus

  • Ulothrix


C.

Rhizopus

Rhizopus is a member of Class- Zygomycetes. The sporangium of Rhizopus is divided into two regions, i.e. outer fertile sporiferous zone and a central sterile columella. Columella (in plants) is an axis of sterile tissue which passes through the center of the spore-case of mosses. 


16.

Viroids have

  • single stranded RNA not enclosed by protein coat

  • single stranded DNA not enclosed by protein coat

  • double stranded DNA enclosed by protein coat

  • double stranded RNA enclosed by protein coat


A.

single stranded RNA not enclosed by protein coat

Viroids are a group of pathogens of some higher plants that are smaller or simpler than any of the known virus. They consist of single stranded linear or circular RNA molecules without a protein coat.


17.

Yeast belongs to which class

  • Basidiomycetes

  • Eumycetes

  • Ascomycetes

  • None of these


C.

Ascomycetes

The yeast (Saccharomyces) is a saprophytic fungus which belongs to class Ascomycetes.


18.

The first phylogenetic system of plant classification was proposed by

  • Engler

  • Engler and Prantl

  • Eichler

  • Wetlstein


C.

Eichler

The first phylogenetic system was proposed by Eichler who is famous for his work entitled "Bluthen Diagramme" published in two volumes.


19.

What are the sex organs provided in some bacteria?

  • Circular DNA

  • Gametes

  • Sex pili

  • Plasmid


C.

Sex pili

During conjugation, sex pili serve as portals of entry of genetic material from donor to recipient cell. 


20.

The bacteria Pseudomonas aeruginosa is useful because of its ability to

  • transfer genes from one plant to another

  • decompose a variety of organic compounds

  • fix atmospheric nitrogen in the soil

  • produce a wide variety of antibiotics


B.

decompose a variety of organic compounds

Pseudomonas aeruginosa is a Gram-negative, aerobic rod belonging to the bacterial family Pseudomonadaceae. These bacteria are common inhabitants of soil water. They occur regularly on the surfaces of plants and occassionally on the surfaces of animals.

• The bacterium will grow in the absence of O2 if NO2 is available as a respiratory electron acceptor.
• They possesses the metabolic versatility. Organic growth factors are not required, and it can use more than thirty organic compounds for growth. Pseudomonas aeruginosa is often observed growing in "distilled water" which is evidence of its minimal nutritional requirements.
• It is able to grow at temperatures as high as 42 degrees.
• Its tolerance to a wide variety of physical conditions, including temperature, contributes to its ecological success and makes it suitable for decomposing a variety of organic compounds in varied environmental conditions.