Bread Mould and Microbes in Water

Q.

Write three ways by which bacteria are useful to us and three ways by which they are harmful?

Q. Bread mould is an example of _________.

1. virus
2. bacteria
3. fungi
4. plant

Q. Which of the following is true for bacteria?

1. They are found only in food.
2. All bacteria are harmful.
3. They can be seen with naked eye.
4. They are of different shapes.

Q. Bread mould is a non-living thing.

1. True
2. False

Q.

Give a reason for the following: Bacteria are both harmful and useful.

Q.

Observe the picture given below. Moulds on bread piece are ______.

1. living

2. non-living

3. cannot say

4. none of these

Q.

when the milk is converted to curd by some bacteria, are the bacterium still existing in the curd

Q. Which of the following are true for bread mould?

1. They can be clearly seen only under a microscope.
2. It is yellow in colour.
3. They emit a foul smell.
4. They are not capable of producing a new mould.

Q. ___________ helps in the conversion of milk to curd.

1. Lactobacillus
2. Bread mould
3. Rhizobium
4. Dried leaf

Q. Bacteria are _________ to human beings.

1. Useful
2. Harmful
3. Both a and b
4. None of the above

Q. How microorganisms increase amount of protein in short duration?

Q. Identify the statement(s) which is/are true from the following.

1. Tiny thread-like structures observed on rotten bread are Lactobacillus.
2. Mould is used for conversion of milk into curd.
3. A little amount of buttermilk is added to milk to obtain curd.
4. Bacteria can either be useful or harmful to humans.

Q. ___________ helps in the conversion of milk to curd.

1. Lactobacillus
2. Bread mould
3. Rhizobium
4. Dried leaf

Q. Bacteria are _________ to human beings.

1. Useful
2. Harmful
3. Both a and b
4. None of the above