Bacteria

Q. Bacterial leaf blight of rice is caused by a species of :

1. Alternaria
2. Erwinia
3. Xanthomonas
4. Pseudomonas

Q.

Dead remains of animals and plants are decomposed through microbial activity to produce ammonia. This event is known as :

1. Denitrification

2. Symbiotic nitrogen fixation

3. Nitrification

4. Ammonification

Q.

A leguminous crop does not require nitrogenous fertilizers.

1. True
2. False

Q.

Is archaebacteria eukaryotic or prokaryotic?

Q. Lysozyme that is present in saliva and tears destroys:

1. Certain fungi
2. Certain types of bacteria
3. All viruses
4. Most virus infected cells

Q. When a bacterium is said to be amphitrichous, it means that it has

1. no flagella
2. flagella at one end
3. flagella at both ends
4. flagella all around

Q.

What is the name of the main stain in gram staining?

1. Cyano stain

2. Crystal violet

3. Glycogen stain

4. Purple stain

Q. Give examples of photosynthetic microorganisms which also fix atmospheric nitrogen.

Q. Amoebocytes are found in sponges inside

1. Pinacoderm
2. Gastroderm
3. Mesogloea
4. All the above

Q. Just as Xenopsylla is to Yersinia pestis, so is

1. Glossina palpalis to Wuchereria bancrofti
2. Culex to Plasmodium falciparum
3. Homo sapiens to Taenia solium
4. Phlebotomus to Leishmania donovani

Q. How many of these pairs are mismatched?
(i) Comma-shaped - Diplococcus
(ii) Rod-shaped - Spirochaete
(iii) Helical - Streptobacillus
(iv) Spherical - Vibrio cholerae

1. 1
2. 2
3. 3
4. 4

Q.

The shape of the cocci bacteria is

1. Rod-shaped

2. Comma-shaped

3. Spiral

4. Spherical

Q. Given below is an assertion and reason.
Assertion: Gram negative bacteria do not retain the stain when washed with alcohol.
Reason: The cell wall of gram negative bacteria contains lipopolysaccharides.
Select the correct alternative among the following.

1. A
2. B
3. C
4. D

Q.

Membrane-bound organelles are absent in

1. Plasmodium

2. Saccharomyces

3. Streptococcus

4. Chlamydomonas

Q. What is the length of a typical bacteria?

Q. Why are viruses called nucleoproteins

Q. Spicules develop in sponges from cells located inside

1. Pinacoderm
2. Gastroderm
3. All the above
4. Mesophyl layer

Q. Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen ?

1. Bacillus
2. Pseudomonas
3. Mycoplasma
4. Nostoc

Q. What is meant by dikaryon conditions?

Q.

The longer, sparser appendages called are called as

1. Pili

2. flagella

3. fimbriae

4. pilin

Q. Chromosomes in a bacterial cell can be 1 - 3 in number and :

1. Are always circular
2. Are always linear
3. Can be either circular or linear, but never both within the same cell
4. Can be circular as well as linear within the same cell

Q. Which of the organ systems is affected by bubonic plague?

Q. what is the difference between mesosome and chromatophore!