How can we prevent the following diseases?
(a) Cholera (b) Typhoid (c) Hepatitis-A

5

(a)

Give causative microorganism, mode of transmission and one preventive measure Qf human diseases like Polio, Cholera and Hepatitis-B.

5

(a)

During biology class, teacher was telling about microbes and how they are useful to humans. Hearing this, Jasmine got confused as she knew the TB caused to her uncle is due to a microbe. She asked his teacher about it. The teacher appreciated her for question and explained the whole class.
(a) What are microbes?
(b) How are microbes helpful to humans?
(c) Name one microbe
(i) used in household products.
(ii) used in antibiotics.
(d) Mention two diseases other than TB caused by microbes.
(e) Identify the values shown by Jasmine.

5

(a)

Observe the figure and answer the following questions.

(a) Name the microorganism and the group to which it belongs.
(b) Name the food item on which the organism grows.
(c) Does it grow well in dry or in moist conditions?
(d) Is it safe to eat infected bread?

5

(a)

Write a short paragraph on the diseases caused by micro-organisms.

5

(a)

Explain and draw nitrogen cycle.

5

(a)

What do you understand by food preservation?
Explain any four methods of food preservation.

5

(a)

Write a short note on. Useful micro-organisms.

5

(a)

What are food preservatives? Explain some common food preservatives.

5

(a)

Explain the use of Bacteria, Fungi and Algae.

5

(a)