Read the following statement regarding bacteria.

I. Bacteria exchnage their genetic matter through conjugation which involve cell to cell contact.

II. Transduction in 'Salmonella is reported by Tatum and Lederberg in 1952.

III. Citrus canker disease is caused by bacteria Xanthomonas citri.

IV. Hans Christian gram's staining method is based on cell wall composition of bacteria.

Choose the correct option with true statements.

(1) I and III

(2) I, III and IV

(3) I, II, and III

(4) II and IV

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Heterocysts present in Nostoc is specialised for

(1) fragmentation

(2) nitrogen-fixation

(3) symbiotic relation

(4) food storage

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Refer to the following figures.

Match the following columns and choose the correct option from the codes given below.

C-I

Column I

Column II

A

I. Euglena

I. kinetoplast

B

II. Paramecium

II. Trichocysts

C

III. Trypanosoma  

III. Astaxanthin

Codes:

 

A

B

C

(1)

3-II    

1-III     

2-I

(2)

1-II

3-I

2-I

(3)

1-III

2-II

3-I

(4)  

3-I

2-II

1-III

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The given below figure shows a generalised life cycle of a fungus. Identify A, B and C from the given option.

 

A

B

C

(1)

Meiosis  

Fertilisation   

Meiosis

(2)

Meiosis

Mitosis

Fertilisation

(3)

Mitosis

Meiosis

Fertilisation

(4)  

Mitosis

Fertilisation

Meiosis

 

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Read the following statements regarding archaebacteria.

I. Their cell wall lacks peptidoglycan.

II. They contain membrane bound organelles.

III. These have distinct ribosomal RNA sequence.

IV. Lipid in cell membrane of archaebacteria have different structure than those in all other organisms.

Choose the incorrecct option.

(1) I and II

(2) Only II

(3) Only IV

(4) III and IV

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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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