Saprotrophs live on dead organic matter, which they utilize

  • by phagocytosis

  • after digestion by extracellular enzymes synthesised by them

  • by endocytosis

  • by pinocytosis

Select the option that correctly identifies the different genera (A, B, C and D) of Kingdom Fungi shown in figure.

 

A

B

C

D

(1)

Mucor

Saccharomyces  

Morchella

Amanita

(2)

Mucor

Saccharomyces

Penicillium

Agaricus

(3)

Rhizopus

Saccharomyces

Aspergillus  

Morchella

(4)  

Aspergillus  

Rhizopus

Penicillium

Agaricus

 
  • 1
  • 2
  • 3
  • 4

The protists have

  • only free nucleic acid aggregates

  • membrance bound nucleoproteins lying embedded in the cytoplasm

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

  • none of these

In prokaryotes, genetic recombination can occur during

  • transduction

  • transformation

  • conjugation

  • all of these

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

  • Soredia

  • Isidia

  • Cyphella

  • Cephalodia

Viroids have

  • single stranded RNA not enclosed by protein coat

  • single stranded DNA not enclosed by protein coat

  • double straded DNA enclosed by protein coat

  • double stranded RNA enclosed by protein coat

Which one of the following pairs is correctly matched?

(1)

Rhizobium      

- Parasite in the roots of leguminous plants

(2)

Mycorrhizae

- Mineral uptake from soil

(3)

Yeast

- Production of biogas

(4)  

Myxomycetes     

- The disease ring worm
  • 1
  • 2
  • 3
  • 4

Which one of the following is correctly matched regarding an Institute and its location?

  • National Institute of Virology - Pune

  • National Institute of Communicable Diseases-Lucknow

  • Central Drug Research Institute-Kasauli

  • National Institute of Nutrition-Mumbai

Myxomycetes are

  • saprobes or parasites, having mycelia, asexual reproduction by fragmentation, sexual reproduction by fusion of gametes

  • slimy mass of multinucleate protoplasm, having pseudopodia-like structures for engulfing food, reproduction through fragmentation or zoospores

  • prokaryotic organisms, cellular or acellular, saprobes or autotrophic, reproduce by binary fission

  • eukaryotic, single-celled or filamentous, saprobes or autotrophic, asexual reproduction by fusion of two cells or their nuclei

In prokaryotes, chromatophores are

  • specialized granules responsible for colouration of cells

  • structures responsbile for organizing the shape of the organism

  • inclusion bodies lying free inside the cells for carrying out various metabolic activities

  • internal membrane systems that may become extensive and complex in photosynthetic bacteria

Among rust, smut and mushroom, two of them 

  • are pathogens

  • are saprobes

  • bear ascocarps

  •   bear basidiocarps

Which of the following is correct match?

 

Disease

Pathogen

(1)

Wilt disease

Synchytrium

(2)

Citrus canker

Xanthomonas

(3)

Red rot of sugarcane    

Ustilago

(4)  

Powdery mildew

Fusarium
  • 1
  • 2
  • 3
  • 4

Which one of the following pairs is not correctly matched?

(1)

Streptomyces     

- Antibiotic

(2)

Serratia

- Drug addiction

(3)

Spirulina

- Single cell protein

(4)  

Rhizobium     

- Biofertilizer
  • 1
  • 2
  • 3
  • 4

The outermost limiting layer of mycoplasma is made up of

  • cell wall

  • cell membrane

  • mucilaginous sheath

  • slime layer

By all of the following ways bacteria become resistant to antibiotic except

  • making enzymes that inactivate the drug

  • becoming impermeable to the drug

  • modifying the target of the drug

  • moving away from the drug.

Protista differs from monera in having

  • cell wall

  • autotrophic nutrition

  • flagella

  • nuclear membrane

Kingdom Animalia is characterised by

  • direct dependence on autotrophs

  • indirect dependence on autotrophs

  • absence of chlorophyll

  • absence of cell wall

The genetic material in tobacco mosaic virus is

  • ss DNA

  • ss RNA

  • ds RNA

  • ds DNA

Yeast is not included in protozoans but in fungi because

  • it has chlorophyll

  • it shows saprotrophic mode of nutrition

  • it has eukaryotic organisation

  • cell wall is made up of cellulose and reserve food material as starch.

If any organism has non cellulosic cell wall where can it be placed according to whittaker's system of classification?

  • Monera

  • Protista

  • Fungi

  • Both (1) and (3)

Identify the labelled part in the given figure and select the correct option.

 

A

B

(1)

Heterocyst

Mucilaginous sheath

(2)

Mucilaginous sheath  

Heterocyst

(3)

Heterocyst

Capsid

(4)  

Pseudopodia

Mucilaginous sheath
  • 1
  • 2
  • 3
  • 4

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.

  • I and III

  • I, III and IV

  • I, II, and III

  • II and IV

Heterocysts present in Nostoc is specialised for

  • fragmentation

  • nitrogen-fixation

  • symbiotic relation

  • food storage

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
  • 1
  • 2
  • 3
  • 4

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.

  • I and II

  • Only II

  • Only IV

  • III and IV

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?

  • 5 × 105 cells

  • 35 × 105 cells

  • 32 × 105 cells

  • 4.175 × 105 cells

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

  • clamp connections

  • somatogamay between two hyphae of different strains

  • Both (1) and (2) are correct

  • basidiospores

'Red tide' is caused by

  • Gonyaulax

  • Ceratium

  • Triceratium

  • All of these

Which one of the following shows heterothallism?

  • Rhizopus

  • Bacterium

  • Cycas

  • Ricinus

The common characteristic showning by mushroom, smut and rust

  • is characterised by presence of basidiocarps

  • is characterised by presence of ascocarps

  • all are pathogen

  • all are saprophytic in nature

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