Q: Which of the following is a genetic vector?

Clostridium is saprophytic, anaerobic N2 fixing bacteria and have ability to fix atmospheric N2 into NH3 .

Q: Bacteria bearing flagella all over the body are called:

Azotobacter (aerobic) is a free living N2 , fixing bacteria. This bacteria fix independently atmospheric nitrogen in their body and convert to organic nitrogen compounds. When they die, the organic nitrogen compounds of their body are made available to higher plants through the activities of other bacteria.

Question 1

Which of the following statement is correct?

Accepted Answer

Correct answer is C

Question 2

Bacteria were first discovered by:

Accepted Answer

Correct answer is D

Question 3

On the basis of r -RNA genes bacteria are divided into:

Accepted Answer

Correct answer is B

Question 4

In Escherichia coli:

Accepted Answer

Correct answer is C

Question 5

Which of the following fixes CO2​ in carbohydrates?

Accepted Answer

Rhodospirillium is photosynthetic bacteria.

Question 6

Bacteria are considered as plants, because:

Accepted Answer

Correct answer is A

Question 7

Membrane-bound organelles are absent in:

Accepted Answer

Correct answer is C

Question 8

How many organisms in the list given below are autotrophs Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Wolfia?

Accepted Answer

Nostoc, Chara, Porphyra and Wolfia are Photoautotrophs while Nitrosomonas and Nitrobacter are chemoautotrophs.

Question 9

Gram -ve and +ve bacteria have cell membrane made up of:

Accepted Answer

The number of bacteria becomes double after each division.

Question 10

Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belong to the two groups:

Accepted Answer

Correct answer is B

Question 11

The chief component of bacterial cell wall is:

Accepted Answer

Correct answer is A

Question 12

Bacteria whose cell has only a curve/comma is:

Accepted Answer

In the process of transduction, virus is used as a carrier in the transfer of DNA from one bacterial cell to other.

Question 13

The main difference between Gram positive and Gram negative bacteria lies in the composition of:

Accepted Answer

Correct answer is A

Question 14

Muramic acid is present in the cell wall of:

Accepted Answer

Correct answer is B

Question 15

The shape of the cocci bacteria is:

Accepted Answer

Temperate phages are the avirulent lysogenic phages whose nucleic acids get incorporated in the bacterial DNA (lysogenization). When these phages infect bacteria, the bacterial cell undergoes many divisions and prophages are formed.

Question 16

Match the following pairs correctly and choose the right combination A.  B.  C.  D. ​ Column-I  Escherichia coli  Rhizobium melilotae  Bacillus thurigiensis  Pseudomonas putida ​ Column-II  1. ’nif’ gene 2. Digests hydrocarbon of  crude oil ​ 3. Production of human insulin  4. Biological control of fungal  disease ​​  5. Bio-decomposed insectiside

Accepted Answer

Correct answer is C

Question 17

Helically coiled shaped bacteria are called:

Accepted Answer

Spirulina is SCP rich in protein, vitamins and minerals and rice variety rich in iron content. 250 gram biomass of Methylophilus methylotrophus produce 25 tonn protein/day while cow of 250Kg produces only 200gm protein/day.

Question 18

Which of the following is a genetic vector?

Accepted Answer

Clostridium is saprophytic, anaerobic N2​ fixing bacteria and have ability to fix atmospheric N2​ into NH3​ .

Question 19

Bacteria bearing flagella all over the body are called:

Accepted Answer

Azotobacter (aerobic) is a free living N2​ , fixing bacteria. This bacteria fix independently atmospheric nitrogen in their body and convert to organic nitrogen compounds. When they die, the organic nitrogen compounds of their body are made available to higher plants through the activities of other bacteria.

Question 20

The habitat of E coli is:

Accepted Answer

Bacteria causes N2​ fixation.

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Solution for Class 11, Biology, Biological Classification

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