Structure and Characteristics of Bacteria

Q. Name three diseases in plants which are caused by microbes.

Q.

Tikka disease of groundnut is caused by which pathogen?

1. Xanthomonas citri

2. Tungrovirus

3. Pyricularia oryzae

4. Cercospora personatum

Q.

Why should we preserve food?

Q.

Choose the correct reason as to why the malarial parasite 'Plasmodium' is carried only by female anopheles mosquito and not by the male mosquito.

1. The female requires blood proteins to produce eggs.

2. Plasmodium cannot survive longer inside a female mosquito.

3. Plasmodium kills male mosquitos.

4. Female mosquitoes are stronger than male mosquitoes.

Q.

Give the name of a symbiotic bacterium.

Q. Name the biggest bacteria which can be seen with unaided eyes.

1. Lactobacillus
2. Thiomargarita namibiensis
3. Rhizobium
4. Bacillus thuringiensis

Q.

Paheli watched her grandmother making mango pickle after she bottled the pickle her grandmother poured oil on top of the pickle before closing the lid paheli wanted to know why oil was poured.

Q.

13.Name any two groups of micro-organisms from which antibiotics could be extracted.

Q.

Can freezing kill enzymes?

Q. Do bacteria never have cilia?

Q.

Which disease is not transmitted by mosquitoes?

1. Dengue

2. Malaria

3. Brain fever or encephalitis

4. Pneumonia

Q.

Tuberculosis is caused by

1. bacterium

2. virus

3. protozoan

4. malnutrition

Q.

___________ are used for the preservation of food.

Q. Harmful microbes not only harm our body but also the environment.

1. True
2. False

Q.

How long does it take blue-green algae to make you sick?

Q. Name three diseases in plants which are caused by microbes.

Q. The vector and host for malaria are _________ and _________, respectively.

1. mosquito; human
2. mosquito; housefly
3. human; human
4. housefly; mosquito

Q. Which among the following will not help in the prevention of malaria?

1. Fixing mosquito net on the windows.
2. Drinking boiled water.
3. Keeping the surroundings dry and clean.
4. Spraying insecticides on stagnant water.

Q. Name three diseases in plants which are caused by microbes.

Q. Bacteria exist in different shapes.

1. True
2. False

Q.

• Its symptom is veinal chlorosis of leaves.
• It cannot be controlled chemically.
• Its mode of transmission is insect.

Identify the disease and its causal organism on the basis of given information and select the correct option.

	Diseases	Causal organisms
(i)	Yellow vein mosaic	Yellow vein mosaic virus
(ii)	Tobacco mosaic	Tobacco mosaic virus
(iii)	Rust of wheat	Puccinia graminis
(iv)	Citrus canker	Xanthomonas citri

1. (i)
2. (iii)
3. (ii)
4. (iv)

Q. Select the pair of diseases that are caused by contaminated water.​

1. Malaria and pneumonia​
2. Cholera and typhoid​
3. Diarrhoea and common cold​
4. Pneumonia and typhoid​

Q. Tuberculosis is caused by bacteria.

1. False
2. True

Q. Which of the following diseases is/are spread by a vector?

1. Dengue
2. Malaria
3. Cholera
4. Typhoid

Q. Sunil ate 'pani-puri' with his friends. He started getting stomach ache, diarrhoea, weakness and loss of appetite. He is likely to be suffering from which of the following disease?

1. Tuberculosis
2. Malaria
3. Typhoid
4. Ringworm

Q. All bacteria are harmful.

1. True
2. False

Q.

Which is the mode of transmission for the plant disease called citrus canker?

1. Water

2. Soil

3. Seed

4. Air

Q. Name the biggest bacteria which can be seen with unaided eyes.

1. Thiomargarita namibiensis
2. Rhizobium
3. Lactobacillus
4. Bacillus thuringiensis

Q. Identify the bacterial diseases.

1. Tuberculosis
2. Typhoid
3. Malaria
4. Dengue
5. Cholera
6. Tetanus
7. Polio
8. Diphtheria