Useful and Harmful Microbes

Q.

Explain the different methods of food preservation. [5 MARKS]

Q. Which of the following is NOT a leguminous plant?

1. Pea
2. Horse gram
3. Green gram
4. Rice

Q. What is pasteurization?

Q. Name the process in which sugar is converted into alcohol?

1. Respiration
2. Fermentation
3. Dissection
4. Bubbling

Q.

What biosafety level is designed for organisms that dont usually cause disease in humans?

Q. Yeast cell has a distinct cell wall.

1. True
2. False

Q. You have always seen your mother boil the milk and then cool it down. What is the process known as and what is its significance?

Q. __________ is defined as the biological remedy to abate or clean up the contamination.

1. Biomagnification
2. Bioremediation
3. Pyrolysis
4. Aerobic decomposition

Q. What is the basis of the long life of pickles and jams?

Q.

Do humans use fermentation?

Q. Pick the correct matches for all the microbes.
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ 1.Penicillium& \text{a. Bakery products}\\ 2.Clostridium& \text{b. Source of antibiotics}\\ 3.Rhizobium& \text{c. Food poisoning}\\ \text{4. Yeast}& \text{d. Nitrogen fixation}\end{array}$

1. 1-a, 2-b, 3-d, 4-c
2. 1-c, 2-a, 3-b, 4-d
3. 1-d, 2-a, 3-b, 4-c
4. 1-b, 2-c, 3-d, 4-a

Q. Statement 1 : Chicken pox can be transmitted by an infected individual to a healthy person by direct contact.

Statement 2 : Chicken pox is a communicable disease.

1. Both the statements are correct
2. Both the statements are incorrect
3. Only statement 1 is correct
4. Only statement 2 is correct

Q.

How is milk pasteurised and why is it necessary? [3 MARKS]

Q. Complete the statements using the proper option from those given below. Explain the statement.
(mycotoxins, budding, rhizobium)
Leguminous plants can produce more proteins due to _______.

Q. Which of the following serve as a preservative?

1. Oil
2. Spinach
3. Onion
4. Tomato

Q. Yeast cell wall is made up of?

Q. Which of the following diseases can be treated using antibiotics?

1. AIDS
2. Malaria
3. Ringworm
4. Cholera

Q. Excess, unnecessary or incomplete dosage of antibiotics may lead to

1. increased immunity
2. increase in efficiency of blood
3. resistance of bacteria against that antibiotic
4. all of these

Q. Identify the microbes.

1. Bacteria
2. Ants
3. Virus
4. Algae
5. Fungi
6. Lice
7. Termite
8. Protozoans

Q. Antibiotics work against bacterial infections but not viral infections.

1. True
2. False

Q. Which of the following microbes causes malaria?

1. Microsporum
2. HIV
3. Plasmodium
4. Trichophyton

Q. Excess, unnecessary or incomplete dosage of antibiotics may lead to:

1. increased immunity
2. increase in efficiency of blood
3. resistance of bacteria against that antibiotic
4. all of these

Q. jams and pickels do not spoil easily give reason

Q. Excess of vegetable oil is added in the preparation of pickle and the pickle jars are salted before the pickle is added into the jar. What is the purpose of doing so?

1. Fermentation
2. Pastuerization
3. Coagulation
4. Preservation

Q.

oil and vinegar acts as food preservatives why

Q. Which of the following statement/s hold true in case of Rhizobium?

1. They live in the root nodules of leguminous crops.
2. They help in the process of nitrogen fixation.
3. They can reduce the dependency and expenses on fertilisers.
4. They are oval cells and reproduce by budding.

Q.

Which of the following statements are correct regarding probiotics?

i. Probiotics restore bacteria present in the intestine.

ii. Probiotics cause different diseases.

iii. Probiotics improve our immunity.

iv. Probiotics can be taken along with food.

1. i and ii

2. i, iii and iv

3. ii and iii

4. ii and iv

Q. Excess of vegetable oil is added in the preparation of pickle and the pickle jars are salted before the pickle is added into the jar. What is the purpose of doing so?

1. Pastuerization
2. Fermentation
3. Coagulation
4. Preservation