A bacterium divides every 35 minutes. If a culture containing 105 cells/mL is grown for 175 minutes, what will be the cell concentration/mL after 175 minutes?

(1) 5 × 105 cells

(2) 35 × 105 cells

(3) 32 × 105 cells

(4) 4.175 × 105 cells

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Dikaryotisation (n + n) in Agaricus is brought about by

(1) clamp connections

(2) somatogamay between two hyphae of different strains

(3) Both (1) and (2) are correct

(4) basidiospores

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Phylogenetic system of classification includes

(1) evolutionary trends only

(2) genetic trends only

(3) evolutionary trend as well as morphology

(4) behavioural trends in environment

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'Red tide' is caused by

(1) Gonyaulax

(2) Ceratium

(3) Triceratium

(4) All of these

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Which one of the following shows heterothallism?

(1) Rhizopus

(2) Bacterium

(3) Cycas

(4) Ricinus

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Which of the following is a 'cyanophage'?

(1) S-13

(2) ϕ×174

(3) SV-40

(4) LPP-1

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Match items in Column I with those in Column II.

 

Column I

 

Column II

A.

Peritrichous flagella

1.

Ginkgo

B.

Living fossil

2.

Macrocystis

C. 

Rhizophore

3.

E.coli

D.

Smallest flowering plant    

4.

Selaginella

E.

Largest perennial alga

5.

Wolffia

 

 

A   

B   

C   

D   

E

(1)

3

1

4

5

2

(2)

2

3

4

1

5

(3)

4

2

1

5

3

(4)  

2

4

3

5

1

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The common characteristic showning by mushroom smut and rust

(1) is characterised by presence of basidiocarps

(2) is characterised by presence of ascocarps

(3) all are pathogen

(4) all are saprophytic in nature

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Which one exhibits the character of a protozoan during one phase of its life cycle and character of fungi in another phase of its life cycle?

(1) Water moulds

(2) Psilophytes

(3) Slime moulds

(4) Diatoms

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Spirochaetes is/are

(1) a class of viruses

(2) myxobacteria

(3) spiral-shaped bacteria

(4) richittsias

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