Introduction to Microorganisms

Q.

Write 10 lines on the usefulness of microorganisms in our lives.

Q. With the help of diagram describe Prokaryotic cell.

Q.

Define infection.

Q.

Why do bacteria have ribosomes?

Q.

Give an example of a unicellular organism.

Q.

Give one word for the following -
Medicines are used to kill germs and cure diseases.

Q.

How fast do bacteria multiply?

Q.

What are antibiotics? Give two examples of antibiotics. Which organisms, bacteria or fungi, are used for the production of antibiotics?

Q.

Which of the two is a spherical bacteria :- coccus or bacillus?

Q.

_____________ is a single-celled body that has an oval shape.

1. Chlamydomonas

2. Amoeba

3. Paramecium

4. Yeast

Q.

What evidence supports the bacterial origin of mitochondria?

Q.

Ribosomes are concerned with the synthesis of ________.

Q.

State the differences between (a) Decay and putrefaction and (b) Pasteurization and sterilization of food/objects/equipment

Q.

What do we name the process that in the absence of oxygen consumes sugar and converts it into different products?

1. Fermentation

2. Respiration

3. Bubbling

4. Dissection

Q.

Substances that are produced by the body to fight against the invader is:

1. Antibiotic

2. Vaccine

3. Antibody

4. Antigen

Q. What is meant by fermentation

Q. Give the correct sequence of the fate of nitrogen gas in nitrogen cycle.

1. Gaseous nitrogen fixed in the soil
2. Nitrogen fixed in soil is converted to ammonia
3. Ammonia is converted into nitrates
4. Nitrates are converted back to gaseous nitrogen

Q.

Disease causing microorganisms are known as:

1. Bacteriophages

2. Pathogens

3. Microbes

4. Amoebae

Q.

In Antarctica, food rarely gets spoiled.

1. The air in Antarctica is toxic to microbes

2. Extreme low temperatures of Antarctica does not support microbial growth

3. Faecal matter of migratory birds has antimicrobial property

4. Microbes only grow in extremely hot conditions

Q. is the symbiotic association between algae and fungus.

1. Lichen
2. Cuscuta
3. Rhizobium

Q. red rot of sugarcane and tikka disease of groundnut is caused by?

Q.

What is Plasmodium?

Q. A solution containing weakened or dead microbes, introduced into a healthy person's body to produce antibodies (immunity) against the disease-causing microbes is known as ___.

1. vaccine
2. antibiotic
3. vitamin
4. antibody

Q. Match the following.

1. Gram negative
2. Archaea
3. Micronucleus
4. Coil

Q.

Which of the following is Chlamydomonas?

1. 

2. 

3. 

4. 

Q.

Which of the following is not a content of a vaccine?

1. Dead pathogens

2. Living, weakened microorganisms

3. Toxoids

4. Antibiotics

Q.

How does droplet infection transmit a disease?

Q. Match the following diseases correctly with their possible symptoms.

1. Yellow spots
2. Brown spots
3. Skin ulcers

Q.

Cooking food helps in killing the microorganisms present in it.

1. False

2. True

Q.

Which of the following is Chlamydomonas?

1. 

2. 

3. 

4.